WO2016023158A1

WO2016023158A1 - Video transmission method and device

Info

Publication number: WO2016023158A1
Application number: PCT/CN2014/084108
Authority: WO
Inventors: 王飞; 韩广林
Original assignee: 华为技术有限公司
Priority date: 2014-08-11
Filing date: 2014-08-11
Publication date: 2016-02-18
Also published as: CN106464981B; CN106464981A

Abstract

The present invention relates to the technical field of mobile communications. Disclosed are a video transmission method and device, the method comprising: acquiring a video information and network transmission condition of a video to be encoded, and determining a first code rate and a second code rate; according to a historical play score and preset gradient value of the second code rate, determining a code rate level number of a reference code rate; according to the first code rate, the second code rate, and the code rate levels of the first code rate and the second code rate, acquiring a plurality of reference code rates of the video to be encoded; according to the plurality of reference code rates, encoding the video to be encoded; and based on the encoded video clip of the plurality of reference code rates, conducting video transmission. The technical solution determines, according to score information representing the intuitive experience of a user of video playing, the reference code rate employed in encoding, such that the transmitted video better satisfies an actual play requirement of the user after being encoded and transmitted according to the reference code rate, thus significantly improving the play effect of the video under the same transmission condition.

Description

Video transmission method and device

The present invention relates to the field of mobile communications technologies, and in particular, to a video transmission method and apparatus. Background technique

With the rapid development of mobile communication technologies, mobile video services have become the mainstream in mobile communication services. Various forms of mobile video such as video on demand, video telephony or video ring tones are gradually integrated into people's daily lives. At present, with the popularization of various high-definition and ultra-high-definition mobile videos, users have put forward higher requirements for the quality of online video playback. Based on this situation, the traditional HTTP (Hypertext Transfer Protocol)-based progressive download streaming media playback method can no longer meet the needs of users. Therefore, how to provide high-quality video transmission services has become an operator and video provider. The focus of common concern.

At present, the solution provided by the prior art includes: application HAS (HTTP Adaptive Streaming) technology can select the code rate of a video segment to be transmitted according to channel conditions, so that there is no long delay in video playback. Rushing, enabling users to get a better viewing experience. The HAS technology implementation method includes: (1) segmenting the video to be encoded to obtain a plurality of video segments. (2) Each video segment is encoded based on a plurality of code rates specified by the vendor to obtain a video version of a plurality of code rates corresponding to each video segment. (3) when the server receives the transmission request for the video, according to the transmission condition of the current terminal, determining the code rate that can be transmitted under the transmission condition of the current terminal, according to the code rate, from the multiple video versions of the video segment, Select a higher bit rate video version for transmission.

In the process of implementing the present invention, the inventors have found that the prior art has at least the following problems: The prior art proposes that when encoding a video segment, the video segment is encoded according to only a plurality of code rates specified by the video operator, such as If the vendor specifies four code rates such as 100k, 300k, 500k and 700k, the video fragments of the above four code rates are stored on the server. At this time, the terminal requests In the case of line video transmission, if the transmission condition of the terminal allows transmission of a video segment below 500k code rate, the server will select a video segment of 300k code rate from the above four code rates for transmission. However, it can be seen from the perspective of the terminal that the channel conditions at this time actually allow transmission of video clips of 400k-500k code rate. In the case of the channel, the larger the bit rate, the better the playback effect. However, due to the limitation of the video operator in the encoding process, the video segment of the corresponding bit rate is not provided, and the video playback effect is limited, resulting in the provided The video clip does not match the user's actual playback needs. Summary of the invention

In order to solve the problem that the provided video clip does not match the actual playing requirement of the user, the embodiment of the present invention provides a video transmission method and apparatus. The technical solution is as follows:

In a first aspect, a video transmission apparatus is provided, the apparatus comprising:

a code rate determining module, configured to obtain video information of the video to be encoded and network transmission conditions, and determine a first code rate and a second code rate, where the first code rate is greater than the second code rate; Determining, according to the historical play score and the preset gradient value of the second code rate, a number of code rate levels of the reference code rate; a reference code rate obtaining module, configured to perform, according to the code rate level of the first code rate and the first code rate a second code rate and a code rate level of the second code rate, to obtain a plurality of reference code rates of the to-be-coded video, and a video coding module, configured to encode the to-be-coded video according to the multiple reference code rates a video transmission module, configured to perform video transmission based on a video segment of a plurality of reference code rates obtained by encoding.

In conjunction with the first aspect, in a first possible implementation manner of the first aspect, the code rate level number determining module includes:

a difference calculation unit, configured to calculate a difference between a preset score and a historical play score of the second code rate; a score interval determining unit, configured to divide the difference according to the preset gradient to obtain a plurality of score intervals; The code rate level number determining unit is configured to use the number of the obtained score sections as the number of code rate levels of the reference code rate.

With reference to the first aspect, in a second possible implementation manner of the first aspect, the reference code rate obtaining module includes: a code rate level determining unit, configured to determine a code rate level of the first code rate according to a number of code rate levels of the reference code rate; a correspondence determining unit, configured to use, according to the first code rate, the first code rate a code rate level, the second code rate, a code rate level of the second code rate, determining an index correspondence relationship between a code rate level and a code rate; a reference code rate obtaining unit, configured to use the index correspondence relationship and the reference A code rate level of the code rate, and obtaining a plurality of reference code rates of the video to be encoded.

With reference to the first aspect, in a third possible implementation manner of the first aspect, the reference code rate obtaining module includes:

Determining an index corresponding to a code rate level and a code rate according to the first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate. The preset formula is: y Ddn^ ^—ra^ + b ; where y is the code rate level, _Vide0 _ _mte is the reference code rate, and β is the first constant, which is the second constant.

With reference to the first aspect, in a fourth possible implementation manner of the first aspect, the video transmission module includes:

a first video segment transmission unit, configured to: transmit, according to a transmission request of the terminal to the encoded video, a first video segment, where the first video segment is a first reference code rate; and a transmission condition determining unit, configured to use the first video segment Transmitting to detect, determining a current transmission condition of the terminal; a second video segment determining unit, configured to determine a second reference code rate from the plurality of reference code rates of the encoded video, the second reference code rate and the terminal current The transmission condition is matched; the second video segment transmission unit is configured to select a second video segment of the second reference code rate, where the second video segment is the next segment of the first video segment.

In conjunction with the fourth possible implementation of the first aspect, in a fifth possible implementation manner of the first aspect, when the first video segment is the first video segment to be transmitted in the encoded video The first reference code rate is less than a code rate requested by the terminal.

In conjunction with the first aspect, in a sixth possible implementation manner of the first aspect, the device further includes: a play score acquisition module, configured to obtain a play rating of the encoded video in different play scenarios. The play score is used to determine a score of a plurality of reference code rates; the score standard deviation calculation module is configured to calculate a score standard deviation of the plurality of reference code rates according to the scores of the plurality of reference code rates; and preferably a reference code rate selection module, And selecting a preferred reference code rate from the plurality of reference code rates according to the standard deviation of the plurality of reference code rates and the quality evaluation value of the played video.

In conjunction with the sixth possible implementation of the first aspect, in a seventh possible implementation of the first aspect, the score determining module is further configured to include the specified video segment in the encoded video played in the first scenario And playing the score in the first scene as a score of a reference code rate corresponding to the specified video segment, where the specified video segment is a video segment having the same reference code rate, and the number of the specified video segments is greater than a preset number. .

With reference to the sixth possible implementation of the first aspect, in an eighth possible implementation manner of the first aspect, the preferred reference rate selection module includes:

a correlation coefficient calculation unit, configured to calculate a correlation coefficient between a score of the plurality of reference code rates and a quality evaluation value of the played video; and a specified code rate selection unit, configured to select a specified code from the plurality of reference code rates Rate, the standard deviation of the corresponding code rate corresponding to the specified code rate is smaller than the first preset threshold, and the correlation coefficient corresponding to the specified code rate is the maximum value of the correlation coefficients corresponding to the multiple reference code rates; , for using the specified code rate as the preferred reference code rate.

In a second aspect, a video transmission method is provided, where the method includes:

Obtaining video information of the video to be encoded and network transmission conditions, and determining a first code rate and a second code rate, where the first code rate is greater than the second code rate; and a historical play score and a preset gradient value according to the second code rate Determining a number of code rate levels of the reference code rate; obtaining, according to the first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate, acquiring the to-be-coded video a reference code rate; encoding the video to be encoded according to the plurality of reference code rates; performing video transmission based on the video segments of the plurality of reference code rates obtained by the encoding.

With reference to the second aspect, in a first possible implementation manner of the second aspect, determining a number of code rate levels of the reference code rate according to the historical play score and the preset gradient value of the second code rate, including:

Calculating a difference between a preset score and a historical play score of the second code rate; the difference is according to the preset The gradient is divided to obtain a plurality of scoring intervals; the number of the obtained scoring intervals is taken as the number of code rate levels of the reference code rate.

With reference to the second aspect, in a second possible implementation manner of the second aspect, the first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate , obtaining multiple reference code rates of the video to be encoded, including:

Determining, according to the number of code rate levels of the reference code rate, a code rate level of the first code rate; according to the first code rate, a code rate level of the first code rate, the second code rate, and the second code rate a code rate level, determining an index correspondence between the code rate level and the code rate; obtaining a plurality of reference code rates of the to-be-coded video according to the index correspondence and the code rate level of the reference code rate.

With reference to the second aspect, in a third possible implementation manner of the second aspect, the first code rate, the code rate level of the first code rate, the second code rate, and the code rate of the second code rate Level, determining the exponential correspondence between the code rate level and the code rate, including:

With reference to the second aspect, in a fourth possible implementation manner of the second aspect, the video transmission is performed based on the obtained video segments of the multiple reference code rates, including:

Transmitting a first video segment according to a transmission request of the terminal to the encoded video, the first video segment is a first reference code rate; detecting transmission of the first video segment, determining a current transmission condition of the terminal; from the encoded video a plurality of reference code rates, determining a second reference code rate, the second reference code rate matching a current transmission condition of the terminal; selecting a second video segment of the second reference code rate for transmission, the second video segment Is the next segment of the first video segment.

With reference to the fourth possible implementation of the second aspect, in a fifth possible implementation manner of the second aspect, when the first video segment is the first video segment to be transmitted in the encoded video The first reference code rate is less than a code rate requested by the terminal. With reference to the second aspect, in a sixth possible implementation manner of the second aspect, after the video transmission is performed on the video segments of the multiple reference code rates that are obtained by the encoding, the method further includes:

Obtaining a play score of the encoded video in different play scenarios; determining a score of the multiple reference code rates according to the reference code rate of each video segment included in the encoded video and the play score; according to the multiple reference code rates a score, a score standard deviation of the plurality of reference code rates is calculated; and a preferred reference code rate is selected from the plurality of reference code rates according to a score standard deviation of the plurality of reference code rates and a quality evaluation value of the played video.

In conjunction with the sixth possible implementation of the second aspect, the seventh possible implementation in the second aspect

The scores for multiple reference bit rates include:

When the specified video segment is included in the encoded video played in the first scenario, the play score in the first scenario is used as a score of the reference code rate corresponding to the specified video segment, and the specified video segment has the same reference code rate. Video clip, and the number of the specified video clips is greater than a preset number.

With reference to the sixth possible implementation manner of the second aspect, in an eighth possible implementation manner of the second aspect, the standard value of the score of the multiple reference code rates and the quality evaluation value of the played video are Selecting a preferred reference code rate from among multiple reference code rates includes:

Calculating a correlation coefficient between the score of the plurality of reference code rates and the quality evaluation value of the played video; selecting a specified code rate from the plurality of reference code rates, the standard deviation corresponding to the specified code rate is smaller than the first pre- A threshold value is set, and a correlation coefficient corresponding to the specified code rate is a maximum value of correlation coefficients corresponding to the plurality of reference code rates; the designated code rate is used as the preferred reference code rate.

The beneficial effects brought by the technical solutions provided by the embodiments of the present invention are:

The invention determines the first code rate and the second code rate by acquiring video information of the video to be encoded and the network transmission condition, where the first code rate is greater than the second code rate; and the historical play score and the preset gradient value according to the second code rate Determining a number of code rate levels of the reference code rate; obtaining a plurality of reference code rates of the to-be-coded video according to the first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate Encoding the encoded video according to multiple reference code rates; based on the encoded video fragments of multiple reference bit rates, Perform video transmission. With the technical solution provided by the embodiment of the present invention, the reference code rate captured by the code can be determined according to the rating information for reflecting the user's intuitive experience of video playback, so that the coding according to the reference code rate and the video transmission are performed. , can make the transmitted video more in line with the user's actual playback needs, under the same transmission conditions, significantly improve the video playback effect. DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in view of the drawings.

FIG. 1 is a flowchart of a video transmission method according to an embodiment of the present invention;

2 is a flowchart of a video transmission method according to an embodiment of the present invention;

Figure 3 is an exponential curve relationship between the code rate level of the video and the code rate;

4 is a correlation coefficient between a score of a plurality of reference code rates of a video and a quality evaluation value of the played video;

FIG. 5 is a schematic structural diagram of a video transmission apparatus according to an embodiment of the present invention. detailed description

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

FIG. 1 is a flowchart of a video transmission method according to an embodiment of the present invention. Referring to Figure 1, the method flow includes:

101. Obtain video information of the video to be encoded and network transmission conditions, and determine a first code rate and a second code rate, where the first code rate is greater than the second code rate.

102. Determine a number of code rate levels of the reference code rate according to the historical play score and the preset gradient value of the second code rate. 103. Acquire a plurality of reference code rates of the to-be-coded video according to the first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate.

104. Encode the to-be-coded video according to the multiple reference code rates.

105. Perform video transmission based on the video segments of the multiple reference code rates obtained by the encoding.

In another embodiment provided by the present invention, determining a number of code rate levels of the reference code rate according to the historical play score and the preset gradient value of the second code rate, including: calculating a preset score and the second code rate The difference of the historical play scores; dividing the difference according to the preset gradient to obtain a plurality of score intervals; and using the obtained number of score intervals as the number of code rate levels of the reference code rate.

In another embodiment of the present invention, the plurality of to-be-encoded videos are obtained according to the first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate. a reference code rate, comprising: determining a code rate level of the first code rate according to a number of code rate levels of the reference code rate; and according to the first code rate, a code rate level of the first code rate, the second code Rate, the code rate level of the second code rate, determining an exponential correspondence relationship between the code rate level and the code rate; obtaining a plurality of references of the to-be-coded video according to the index correspondence relationship and the code rate level of the reference code rate Code rate.

In another embodiment provided by the present invention, the code rate level and the code are determined according to the first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate. The exponential correspondence between the rates includes: applying a preset formula according to the first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate, and determining a code The exponential correspondence between the rate level and the code rate; the default formula is: y = " x ln(v^o _ ra ) + b where y is the code rate level, _video _ _rate is the reference code rate, a is The first constant, b is the second constant.

In another embodiment of the present invention, the video transmission is performed based on the encoded video segments of the plurality of reference code rates, including: transmitting, according to the transmission request of the terminal to the encoded video, the first video segment, the first video The segment is a first reference code rate; detecting transmission of the first video segment, determining a current transmission condition of the terminal; determining, from a plurality of reference code rates of the encoded video, the second reference code, the second reference code The rate matches the current transmission condition of the terminal; the second video segment of the second reference code rate is selected for transmission, and the second video segment is the next segment of the first video segment. In another embodiment provided by the present invention, when the first video segment is the first video segment to be transmitted in the encoded video, the first reference code rate is smaller than the code requested by the terminal. rate.

In another embodiment of the present invention, after the video transmission is performed on the video segments of the plurality of reference code rates obtained by the encoding, the method further includes: acquiring the encoded video in different playback scenarios, and determining multiple references. a score of the code rate; calculating a score standard deviation of the plurality of reference code rates according to the scores of the plurality of reference code rates; from the score standard deviation of the plurality of reference code rates and the quality evaluation value of the played video, from the A preferred reference code rate is selected among a plurality of reference code rates.

In another embodiment provided by the present invention, determining the scores of the plurality of reference code rates according to the reference code rate of each video segment included in the encoded video and the play score comprises: encoding the played when the first scene is played When a video segment is included in the video, the play score in the first scene is used as a score of a reference code rate corresponding to the specified video segment, and the specified video segment is a video segment having the same reference code rate, and the specified video segment is The number is greater than the preset number.

In another embodiment provided by the present invention, selecting a preferred reference code rate from the plurality of reference code rates according to the standard deviation of the plurality of reference code rates and the quality evaluation value of the played video includes: calculating the multiple Correlation coefficient between the score of the reference code rate and the quality evaluation value of the played video; selecting a specified code rate from the plurality of reference code rates, the standard deviation corresponding to the specified code rate is less than the first preset threshold And the correlation coefficient corresponding to the specified code rate is a maximum value of the correlation coefficients corresponding to the plurality of reference code rates; the designated code rate is used as the preferred reference code rate.

All of the above optional technical solutions may be combined with any combination to form an alternative embodiment of the present invention, and are not described again.

The method provided in this embodiment determines the first code rate and the second code rate by acquiring video information of the video to be encoded and network transmission conditions, where the first code rate is greater than the second code rate; and playing the score according to the history of the second code rate And determining a number of code rate levels of the reference code rate; and obtaining a code to be encoded according to the first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate. Multiple reference code rates; encoding the coded video according to multiple reference code rates; multiple reference codes based on the coding Rate video clips for video transmission. With the technical solution provided by the embodiment of the present invention, the reference code rate captured by the coding can be determined according to the rating information for reflecting the intuitive experience of the user on the video playing, so that the encoding according to the reference code rate and the video transmission are performed. , can make the transmitted video more in line with the user's actual playback needs, under the same transmission conditions, significantly improve the video playback effect. FIG. 2 is a flowchart of a video transmission method according to an embodiment of the present invention. The execution body of the method may be a video server. Referring to FIG. 2, the method flow includes:

201. Obtain video information of the video to be encoded, network transmission conditions, and a historical play score of the video, and determine a first code rate and a second code rate, where the first code rate is greater than the second code rate.

The video to be encoded may be any video stored on the video server side, or may be directly obtained by the video collection device. The video information refers to parameters describing the state of the video, including the resolution of the video, the format of the sample, the original rate, the frame rate, and the compression rate parameters. The network transmission condition refers to the lowest transmission rate provided by the current network to the transmission service. For example, the integrated 3G network can provide a minimum transmission rate of 144 kbs for the high-speed mobile transmission service.

The historical play score of the video is that the video is encoded at a certain code rate, and the video coded video is played, and the user experience score obtained based on the video playback quality. For example, the video A is encoded at a code rate of 128 kbs, and the encoded video A is played, and after the playback is completed, the playback quality of the video A is scored according to the viewing experience of the plurality of users, and the obtained multiple scores are recorded, that is, The multiple scores in the record are the historical play scores for the 128 kbs code rate of the video A. Generally, the historical broadcast score is represented by MOS (Mean Opinion Score).

It should be noted that the first code rate is used to refer to the highest code rate of the video to be encoded. The channel rate corresponding to the to-be-coded video may be determined according to the video information of the video to be encoded, and the highest code rate is the channel rate. For video with different video information, the channel rate determined according to the video information is different, so that the highest code rate corresponding to the video is also different.

As shown in Table 1, the video with a resolution of 988*420 is taken as an example. According to the ratio of the original rate of the video to the compression ratio, the channel rate of the video can be obtained, that is, the calculation formula is 149 Mbps/110. « 1.4Mbps, and the channel rate of the video is also the highest bit rate of the video. Further, the selection of the first code rate of the to-be-coded video is not limited to the channel rate, and a code rate slightly larger than the channel rate may be selected, so that the selection is to reserve redundancy for the code rate of the to-be-coded video. If the network conditions are extremely ideal, the video code rate can be changed in the redundant space, and the channel transmission resources can be fully utilized. For example, for a video with a resolution of 988*420 shown in Table 1, the video channel rate is 1.4 Mbps, and more than 1410 kbps may be selected as the first code rate.

It should be noted that the second code rate refers to a historical play score corresponding to the second code rate based on the network transmission condition and based on the history play score of the code rate, the lowest code rate selected for the video to be encoded. The user's minimum acceptable video bit rate. For example, the integrated 3G network can provide a minimum transmission rate of 144 kbs for high-speed mobile transmission services. In this network, the average MOS of users with a video rate of 128 kbs is 2 points, that is, the 128 kbs code rate is considered acceptable to the user. The lowest video bit rate, then the 128 kbs code rate is the lowest bit rate that can satisfy the user's viewing quality. For a bit rate less than 128 kbs, the corresponding MOS is lower, and the playback quality of the code rate video cannot satisfy the user's viewing experience, and thus the reference value is lost.

Table 1

202. Calculate a difference between a preset score and a historical play score of the second code rate.

The preset score refers to the highest score set for a certain video playback rating. For example, if the highest score is set to 5, if a video is scored, the optional score range is 0 to 5, and if the highest score is set to 10, The video is scored, and the optional score range is 0 to 10 points. This embodiment does not specifically limit this. If the video preset score is set to 5 for a video and the historical play score of the second rate is 2, the difference is 3.

203. The difference is divided according to the preset gradient to obtain multiple score intervals. The preset gradient refers to a change interval set by a historical play score of a video code rate, and the preset gradient can reflect subjective evaluation changes of different code rates. The scoring interval is a MOS interval corresponding to each of the video bit rates, and different scoring intervals may reflect subjective evaluations of the user's video playback quality encoded by different code rates. For example, the preset score of video A is MOS=5, the historical play score of the second code rate is MOS=2, then the difference is 3, and the preset gradient is set to 0.5, and then divided into 0.5 for each 0.5. In the interval, you can get the six MOS intervals (2, 2.5], (2.5, 3], (3, 3.5), (3.5, 4], (4, 4.5), and (4.5, 5).

204. The number of the obtained score intervals is used as the number of code rate levels of the reference code rate.

Wherein, each score interval corresponds to a reference code rate level, and the number of the score intervals is the number of reference code rate levels. The reference code rate refers to a video code rate corresponding to different code rate levels, that is, a code rate having a different history play score. Generally, selecting different levels of reference code rates to encode the video will result in different quality videos. When the video coded based on different levels of reference code rate is transmitted and played, the video transmission quality and playback quality of different effects will also be obtained. Therefore, different playback effects are generated, and accordingly, the video that the user views based on the reference code rate of different levels may also have different viewing effects. As shown in Table 2, according to the six MOS intervals in the table, there are six reference code rate levels, and each reference code rate level corresponds to a different MOS score interval, indicating that the user has a video of the video coded based on each reference code rate. The subjective experience of quality, transmission quality or playback quality is different.

Table 2

205. Determine a code rate level of the first code rate according to the number of code rate levels of the reference code rate. The value rate level value of the reference code rate is the highest reference code rate level, and the highest code rate level is determined as the code rate level of the first code rate.

206. Apply a preset formula to determine a code rate level and a code rate according to the first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate. Index correspondence. The preset formula is: y = " x ln(v^o _ ra ) ₊ b _; where y is the code rate level, _video _ _rate is the reference code rate, _β is the first constant, and b is the second constant.

The first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate are substituted into a preset formula to determine the first constant and the second constant. The value can be used to obtain an exponential correspondence between the determined code rate level and the code rate. For example, for the video A, according to the first code rate of 128 kbs, the code rate level of the first code rate, the second code rate of 1410 kbs, and the code rate level of the second code rate, the four parameters are brought into The preset formula obtains the first constant a=2.079 and the second constant b=−9.1144, that is, the exponential correspondence between the code rate level of the video A and the code rate is y = 2.079 x ln(v ifco _ ra ) - 9.1144. Figure 3 shows the exponential curve relationship between the bit rate level and the code rate of the video A.

Since each reference code rate level has a corresponding relationship with each historical score interval of the user for the video quality, the index correspondence relationship may also reflect the correspondence between the user's subjective score of the video quality and the code rate, that is, the index is adopted. The correspondence can determine the video reference bit rate that meets the user's experience of video quality.

207. Acquire a plurality of reference code rates of the to-be-coded video according to the index correspondence and the code rate level of the reference code rate.

The code rate levels of the reference code rate are brought into the index correspondence relationship to obtain a reference code rate corresponding to the code rate level of each reference code rate, that is, the subsequent step is to encode the video based on the multiple reference code rates. Encode. For example, the exponential correspondence between the bit rate level of the video A and the code rate is y = 2.079 X \n(video _ rate) - 9.1144, and the reference bit rate level is respectively brought into the correspondence relationship, and the reference bit rate is obtained. The reference code rate corresponding to level 1 is 128 kbs, the reference code rate corresponding to reference code rate level 2 is 210 kbs, the reference code rate corresponding to reference code rate level 3 is 350 kbs, and the reference code rate corresponding to reference code rate level 4 is 545 kbs. The reference code rate corresponding to the code rate level 5 is 876 kbs, and the reference code rate corresponding to the reference code rate level 6 is 1410 kbs.

208. Encode the to-be-coded video according to the multiple reference code rates.

The process of encoding the video to be encoded can be implemented by the following steps (1) - (3). (1) Segmenting the video to be encoded to obtain a plurality of video segments. (2) encoding each video segment based on the plurality of reference code rates to obtain a plurality of reference code rate encoded video versions corresponding to each video segment. (3) storing the plurality of video versions in the server, and selecting the subsequent video transmission process. As shown in Table 3, the video A is segmented to obtain N video segments, and each video segment is encoded based on m reference code rates, to obtain m video versions corresponding to each video segment, and each will be The m video versions of the video clip are stored in the server and are selected by the subsequent video transmission process. For example, the video A of the 110s duration is averaged and segmented to obtain 22 video segments of 5s duration. It is known that the video A corresponds to 6 reference code rates, and 22 video segments of 5s duration are based on 6 reference code rates. The codes are separately encoded, so that the video A gets 6*22 video versions, stores the 6*22 video versions in the server and waits for subsequent transmission processing.

table 3

209. Transmit a first video segment according to a transmission request of the terminal to the encoded video, where the first video segment is a first reference code rate.

The first video segment refers to any video segment of the encoded video that the terminal currently applies for transmission, and the “first” does not specifically refer to a certain video segment. The first reference code rate refers to a video version in which the first video segment is encoded based on a certain reference code rate.

When the first video segment is the first transmitted video segment of the encoded video, in order to ensure that the terminal has sufficient buffering time, the user watching the video has no jamming, and the first reference bit rate should be smaller than the terminal device. The requested code rate, that is, the first reference code rate should be less than one level of the bit rate requested by the terminal, and is not an exact match. When the video clip after the video clip is transmitted, the code rate can match the terminal transmission condition. Wherein, the first video segment transmitted in the encoded video may be the already The first video clip of the encoded video may also be that the terminal requests to transmit any one of the video clips during the operation of opening the video. The preset code rate may be a rate limit set by the video provider. When the first video segment is the first video segment to be transmitted in the encoded video, the server selects less than the preset bit rate. The maximum reference code rate is transmitted as the first reference code rate. For example, the reference code rates of the six code rate levels corresponding to a video are 128 kbs, 210 kbs, 350 kbs, 545 kbs, 876 kbs, and 1410 kbs. When the video is transmitted, when the first video segment is the first one of the video to be transmitted. In the case of a video clip, the preset code rate is set to 300 kbs, that is, the first video clip encoded by the reference code rate of 210 kbs is selected for transmission, so that the video playback quality requirement can be satisfied to some extent, and the first one can be transmitted. The video clip can be downloaded quickly in the terminal to reduce the buffering time of the video download waiting, preventing frequent and excessive buffering delay in the video playback, thereby ensuring the user's viewing experience.

210. Detect a transmission of the first video segment, and determine a current transmission condition of the terminal.

Wherein, the transmission condition refers to a channel rate of data transmitted by the channel. In this step, the process of specifically determining the current transmission condition of the terminal may be specifically implemented by the following steps (1) - (3). (1) Obtaining the data capacity of the first video segment. (2) Obtaining a transmission duration of the first video segment. (3) determining the current transmission condition based on the data capacity and the transmission duration of the first video segment. For example, when the video C is transmitted, the data capacity of the first video segment currently transmitted is 600k, and the transmission duration of the first video segment is 2s, the channel rate of the current transmission data of the channel is determined to be 600k/2s=300kbs. . However, the current transmission condition of the terminal may also be determined by other calculation methods, which is not specifically limited in this embodiment.

211. Determine, from a plurality of reference code rates of the encoded video, a second reference code rate, where the second reference code rate matches a current transmission condition of the terminal.

The second reference code rate refers to a reference code rate suitable for the current transmission condition of the terminal, which is selected according to the current transmission condition of the terminal after the first video segment is transmitted. Under the limitation of the current transmission condition of the terminal, the highest reference code rate that meets the limit is selected as the second reference code rate for the transmission of the video segment. 212. Select a second video segment of the second reference code rate, where the second video segment is the next segment of the first video segment.

It should be noted that, in the embodiment, steps 209-212 only describe the transmission process of two video segments in the preceding and succeeding sequence, and in the transmission process of the entire video, multiple video segments need to be transmitted, and then the transmission is performed. The process of multiple video segments follows the transmission method of the two video segments described in steps 209-212 in this embodiment.

Steps 201-212 illustrate the video transmission method. In the video transmission method, according to the scoring information for reflecting the user's intuitive experience of video playback, the reference code rate captured by the encoding is determined, and therefore, after the encoding and video transmission according to the reference code rate, the transmitted video can be made. More in line with the user's actual playback needs, significantly improved video playback under the same transmission conditions

213. Obtain a play score of the encoded video in different play scenarios.

The playback scenario means that each video segment transmitted during the transmission process of the encoded video can select a different reference code rate, so that for different transmission processes of the same encoded video, the process is a Play the scene. For example, the video B is divided into six video segments, and the reference code rate includes 100 kbs, 200 kbs, 300 kbs, 400 kbs, and 500 kbs, and each video segment includes five video versions encoded based on the five reference code rates. Set the flag for each reference bit rate to get the lOOkbs flag as a, the 200kbs flag as b, the 300kbs flag as c, the 400kbs flag as d, and the 500kbs flag as e, then there is a transmission process to select the reference code rate for the first video segment. a, the second video segment selects the reference code rate b, the third video segment selects the reference code rate 1?, the fourth video segment selects the reference code rate, the fifth video segment selects the reference code rate d, and the sixth video segment The reference code rate a is selected, that is, the transmission process is represented as abbcda, and the play scene is also represented as abbcda. As the above process is similar, the video A may also include a play scene 2 as abcdee, a play scene 3 as aaabdc, and other play scenes.

It should be noted that the play score refers to an online play score performed by the user at the terminal after the encoded video is transmitted and played. The number of playback scenes for a certain video can be determined according to the number of video segments of the video and the number of reference code rates. When the video is transmitted in an actual network, the video is The playback scenes will not all appear, or some of the playback scenes will not appear frequently, so you can play scores only for frequently occurring playback scenes. The obtained play score and the corresponding play scene are stored in the server, and are called when the preferred reference code rate is subsequently selected.

214. When a specified video segment is included in the encoded video played in the first scenario, the play score in the first scenario is used as a score of a reference code rate corresponding to the specified video segment, and the specified video segment has the same reference. A video clip of a code rate, and the number of the specified video clips is greater than a preset number.

The preset number may be a number set by the video provider. When the number of the specified video segments included in the encoded video played in the first scene is greater than the preset number, the approximate video is considered to be And performing the transmission at the reference code rate corresponding to the specified video segment, and determining that the play score in the first scenario may represent a score of the reference code rate corresponding to the specified video segment. For example, will video

B is divided into 6 video segments, and the reference code rate includes 100 kbs, 200 kbs, 300 kbs, 400 kbs, and 500 kbs. Each video segment includes 5 video versions encoded based on the 5 reference bit rates, and the preset number is set to 3. Set the flag for each reference bit rate to get the lOOkbs flag as a, the 200kbs flag as b, the 300kbs flag as c, the 400kbs flag as d, and the 500kbs flag as e. If there is a playback scene for the first video segment, select the reference bit rate. a, the second video clip selects the reference code rate a, the third video clip selects the reference code rate a, the fourth video clip selects the reference code rate c, the fifth video clip selects the reference code rate a, and the sixth video When the clip selects the reference code rate a, the play scene is also represented as aaacaa, wherein the reference code rate of the five video clips is a, which is greater than the preset number of 3, then the play score of the play scene may be considered as Refer to the score of the code rate a.

It should be noted that the scores of all the reference code rates obtained are stored in the server for later calculation of the scoring standard deviation call of the reference code rate.

215. Calculate a standard deviation of the plurality of reference code rates according to the scores of the multiple reference code rates. The scores of the respective reference code rates are called from the server, and the scores of the respective reference code rates are calculated based on the six reference code rates of the video A, the video A is played, and the six reference code rates of the video A are recorded. Play score. It should be noted that the play scores of the six reference code rates of the video A described herein refer to the play scores obtained by transmitting and playing the video A based on the six reference code rates. For example, suppose the video A is divided into 10 video segments, each of which is encoded at the six reference code rates shown in Table 4. During the transmission of the video A, 10 or 8 video segments are The 128 kbs encoded video segment is selected, that is, the playback score obtained by the video A after transmission and playback is regarded as the playback score obtained by the reference rate of 128 kbs. The video A is separately transmitted and played under the six reference code rates, and the play score of each reference code rate is recorded, and the play score standard deviation of each reference code rate is calculated based on the play score of each reference code rate. That is, the subjective MOS standard deviation shown in Table 4.

Table 4

216. Calculate a correlation coefficient between the score of the multiple reference code rates and the quality evaluation value of the played video.

Wherein, the quality evaluation value refers to an objective evaluation parameter of the played video. The correlation coefficient can be calculated by the process of the following steps (1) - (3).

(1) In the same play scene, the played video is calculated based on each reference code rate dPSNR (Difference of Peak Signal to Noise Ratio).

Wherein, the calculation formula is as shown in the following formula (1).

dPSNR = PSNR, - PSNR ( 1 )

Wherein, the dPSNR shown in the formula (1) is a peak signal between the video segment J′ and the video reference code rate. Noise ratio difference. '' = 1, ² , ³ , · · ·, Μ denotes a reference code rate, =1 denotes the smallest reference code rate, and =Μ denotes the largest reference code rate. j = m , N represents the N video segments of the video, =i represents the first video segment in the video time direction, and j:N represents the last video segment in the video time direction. The PSN is the peak signal to noise ratio corresponding to the video segment j of the reference code rate i, and the PSNR _n is the peak signal to noise ratio corresponding to the reference code rate n. The dPSNR of the played video based on each reference code rate is calculated by the formula (1).

(2) Calculating an ePSNR (Evoloved Peak Signal to Noise Ratio) value of the played video according to the dPSNR obtained by the played video based on each reference code rate.

Wherein, the calculation formula is as shown in the following formula (2).

ePSNR = ax mean(dPSNR) + bx max(dPSNR) + cx min(dPSNR) + dx std(dPSNR) ( ₂ ) where meanWPS is the peak signal to noise ratio difference of the N video segments in the played video Mean, 丽 (dPSNR is the maximum value of the peak signal-to-noise ratio difference of N video segments in the whole video, minW/^WR) is the peak signal-to-noise ratio difference of N video segments in the whole video. The minimum value of the value,

^/WPSM?) is the standard deviation of the peak signal-to-noise ratio difference for the N video segments in the entire video, a, b, c, and < are pending coefficients.

(3) performing a fitting operation according to the MOS score corresponding to the ePSNR of the played video and the reference code rate n, and obtaining a correlation coefficient between the score of the reference code rate n and the quality evaluation value of the played video. The relationship between the ePSNR of the played video and the MOS score corresponding to the reference code rate n is as shown in the following formula (3).

MOS = p x ePSNR+q ( 3 )

Equation (3) is the relationship between the ePSNR of the played video and the MO score corresponding to the reference code rate n, and p is the parameter to be determined. By fitting the relationship, the parameters p and q can be determined as the correlation coefficient.

It should be noted that the quality evaluation value may be an EPSNR (Evolved Peak Signal to Noise Ratio) value of the video, or may be another parameter value that can reflect the quality of the video playback. The ePSNR value of the video is explained, and other parameter values are not described again. The correlation coefficient reflects the correlation between the quality evaluation value of the broadcast video and each reference code rate. The larger the correlation coefficient is, the greater the correlation between the reference code rate and the play score of the video is, that is, the selection is selected. The reference bit rate for video transmission can better meet the actual playback needs of the user. As shown in FIG. 4, the correlation coefficient between the scores of the plurality of reference code rates of the video A and the quality evaluation values of the played video A is shown.

217. The specified code rate is selected from the multiple reference code rates, where the standard deviation of the corresponding code rate is smaller than the first preset threshold, and the correlation coefficient corresponding to the specified code rate is corresponding to the multiple reference code rates. The maximum value in the correlation coefficient.

The first preset threshold may be a value set by the video provider, and the first preset threshold is used to define a standard deviation of the reference code rate, and the preferred one is selected from the reference code rate that meets the qualified condition. Reference code rate. For example, for video eight, the first preset threshold is set to 0.7, if the correlation coefficient between the scores of the plurality of reference code rates of the video A and the quality evaluation value of the played video A is as shown in FIG. 4, The standard deviation of the scores of the reference codes of the video A is as shown in Table 4. The reference code rate of less than 0.7 can be selected from Table 4 to be 210 kbs and 545 kbs, which can be obtained according to the figure shown in FIG. 4, and the 210 kbs reference code. The correlation coefficient corresponding to the rate is 0.8846, and the correlation coefficient corresponding to the reference code rate of 545 kbs is 0.8804, and 0.8846 is greater than 0.8804, that is, 210 kbs is selected as the specified code rate.

It should be noted that, on the one hand, the smaller the standard deviation of the reference code rate is, the smaller the play score fluctuation of the reference code rate is, so that the more stable the playback effect of the reference code rate is, therefore, the selection standard deviation is small. The specified bit rate is more in line with the actual playback needs of the user. On the other hand, the greater the correlation coefficient between the playback score of the reference code rate and the video quality evaluation value, the closer the objective quality evaluation of the video is to the actual playback requirement of the user. Therefore, selecting the specified code rate with the correlation coefficient can be Significantly enhances video playback under the same transmission conditions.

218. The designated code rate is used as the preferred reference code rate.

The video is scored according to the preferred reference code rate, that is, the play score is considered to have higher accuracy in evaluating the video playback quality, and is consistent with the user viewing experience.

In the embodiment of the present invention, after the preferred reference code rate is determined, the playback of the video may be evaluated according to the preferred reference code rate, and the obtained MOS score can better reflect the subjective experience of the user. For the specific evaluation process, refer to the descriptions of the formulas (1), (2) and (3) described above, and no further description is given here. In addition, video content providers can use the above formula to evaluate video playback to improve playback strategies or network optimization to meet the user's viewing experience.

The method provided in this embodiment determines the first code rate and the second code rate by acquiring video information of the video to be encoded and network transmission conditions, where the first code rate is greater than the second code rate; and playing the score according to the history of the second code rate And determining a number of code rate levels of the reference code rate; and obtaining a code to be encoded according to the first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate. a plurality of reference code rates; encoding the coded video according to the plurality of reference code rates; performing video transmission based on the obtained video segments of the plurality of reference code rates. With the technical solution provided by the embodiment of the present invention, the reference code rate captured by the coding can be determined according to the rating information for reflecting the intuitive experience of the user on the video playing, so that the encoding according to the reference code rate and the video transmission are performed. , can make the transmitted video more in line with the user's actual playback needs, under the same transmission conditions, significantly improve the video playback effect. FIG. 5 is a schematic structural diagram of a video transmission apparatus according to an embodiment of the present invention. Referring to FIG. 5, the apparatus includes a code rate determining module 501, a code rate level number determining module 502, a reference code rate obtaining module 503, a video encoding module 504, and a video transmission module 505.

The code rate determining module 501 is configured to obtain video information of the video to be encoded and network transmission conditions, and determine a first code rate and a second code rate, where the first code rate is greater than the second code rate.

The code rate level number determining module 502 is configured to determine a number of code rate levels of the reference code rate according to the historical play score and the preset gradient value of the second code rate.

The reference code rate obtaining module 503 is configured to obtain multiple references of the to-be-coded video according to the first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate. Code rate.

The video encoding module 504 is configured to encode the to-be-coded video according to the multiple reference code rates. The video transmission module 505 is configured to perform video transmission based on the video segments of the plurality of reference code rates obtained by the encoding.

In another embodiment provided by the present invention, the code rate level number determining module comprises: a difference calculation a unit, configured to calculate a difference between a preset score and a historical play score of the second code rate; a score interval determining unit configured to divide the difference according to the preset gradient to obtain a plurality of score intervals; a code rate level The number determining unit is configured to use the number of the obtained score sections as the number of code rate levels of the reference code rate.

In another embodiment of the present invention, the reference code rate obtaining module includes: a code rate level determining unit, configured to determine a code rate level of the first code rate according to a number of code rate levels of the reference code rate; a relationship determining unit, configured to determine an index between a code rate level and a code rate according to the first code rate, a code rate level of the first code rate, the second code rate, and a code rate level of the second code rate Corresponding relationship; the reference code rate obtaining unit is configured to obtain a plurality of reference code rates of the to-be-coded video according to the index correspondence relationship and the code rate level of the reference code rate.

In another embodiment provided by the present invention, the reference code rate obtaining module includes: a code rate according to the first code rate, the code rate level of the first code rate, the second code rate, and the second code rate. Level, applying a preset formula, determining an exponential correspondence between a code rate level and a code rate; the preset formula is: y ^{= ax l} ^ ^video - ^rate , + where , ; y is a code rate level, and video_mte is Referring to the code rate, a is the first constant and b is the second constant.

In another embodiment of the present invention, the video transmission module includes: a first video segment transmission unit, configured to transmit a first video segment according to a transmission request of the terminal to the encoded video, where the first video segment is the first a transmission rate determining unit, configured to detect a transmission of the first video segment, and determine a current transmission condition of the terminal; and a second video segment determining unit, configured to use, from the plurality of reference code rates of the encoded video, Determining a second reference code rate, the second reference code rate is matched with a current transmission condition of the terminal; a second video segment transmission unit, configured to select a second video segment of the second reference code rate for transmission, the second video The segment is the next segment of the first video segment.

In another embodiment provided by the present invention, when the first video segment is the first video segment to be transmitted in the encoded video, the first reference code rate is smaller than the code requested by the terminal. rate.

In another embodiment of the present invention, the device further includes: a play score acquisition module, configured to acquire a play score of the encoded video in different play scenarios; a score determining module, configured to a reference code rate of each video segment included in the encoded video and the play score, determining a score of the plurality of reference code rates; a score standard deviation calculation module, configured to calculate the multiple references according to the scores of the plurality of reference code rates a standard deviation rate of the code rate; a preferred reference rate selection module, configured to select a preferred reference code rate from the plurality of reference code rates according to the standard deviation of the plurality of reference code rates and the quality evaluation value of the played video .

In another embodiment of the present invention, the score determining module further includes: when the specified video segment is included in the encoded video played in the first scene, the play score in the first scene is corresponding to the specified video segment. The score of the reference code rate, the specified video segment is a video segment having the same reference code rate, and the number of the specified video segments is greater than a preset number.

In another embodiment of the present invention, the preferred reference rate selection module includes: a correlation coefficient calculation unit, configured to calculate a correlation coefficient between the score of the plurality of reference code rates and the quality evaluation value of the played video; a code rate selection unit, configured to select a specified code rate from the plurality of reference code rates, where a standard deviation of the corresponding code rate is less than a first preset threshold, and the correlation coefficient corresponding to the specified code rate is more a maximum of the correlation coefficients corresponding to the reference code rate; a preferred reference code rate determining unit for using the designated code rate as the preferred reference code rate.

Determining a first code rate and a second code rate by acquiring video information of the video to be encoded and a network transmission condition, where the first code rate is greater than the second code rate; determining the historical play score and the preset gradient value according to the second code rate The number of code rate levels of the reference code rate; obtaining a plurality of reference code rates of the video to be encoded according to the first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate; Multiple reference code rates, encoding the coded video; performing video transmission based on the video segments of the plurality of reference code rates obtained by the coding. With the technical solution provided by the embodiment of the present invention, the reference code rate captured by the code can be determined according to the rating information for reflecting the user's intuitive experience of video playback, so that the coding according to the reference code rate and the video transmission are performed. , can make the transmitted video more in line with the user's actual playback needs, under the same transmission conditions, significantly improve the video playback effect. Those skilled in the art can understand that all or part of the steps of implementing the above embodiments can be The completion of the hardware may also be performed by a program to instruct related hardware. The program may be stored in a computer readable storage medium. The storage medium mentioned above may be a read only memory, a magnetic disk or an optical disk. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

Claim

A video transmission device, the device comprising:

a code rate determining module, configured to obtain video information of the video to be encoded and network transmission conditions, and determine a first code rate and a second code rate, where the first code rate is greater than the second code rate;

a code rate level number determining module, configured to determine a number of code rate levels of the reference code rate according to the historical play score and the preset gradient value of the second code rate;

a reference code rate obtaining module, configured to acquire, according to the first code rate, a code rate level of the first code rate, the second code rate, and a code rate level of the second code rate, a plurality of reference code rates; a video encoding module, configured to encode the to-be-encoded video according to the multiple reference code rates; and a video transmission module, configured to perform video segments based on the plurality of reference code rates obtained by the encoding, Video transmission.

2. The apparatus according to claim 1, wherein the code rate level number determining module comprises:

a difference calculation unit, configured to calculate a difference between a preset score and a historical play score of the second code rate; a score interval determining unit, configured to divide the difference according to the preset gradient, to obtain multiple Grading interval

The code rate level number determining unit is configured to use the number of the obtained score sections as the number of code rate levels of the reference code rate.

The apparatus according to claim 1, wherein the reference code rate obtaining module comprises: a code rate level determining unit, configured to determine the first code according to a number of code rate levels of the reference code rate Rate rate level;

a correspondence determining unit, configured to determine a code rate level and a code according to the first code rate, a code rate level of the first code rate, the second code rate, and a code rate level of the second code rate Index pair between rates Should be related;

And a reference code rate obtaining unit, configured to acquire, according to the index correspondence relationship and a code rate level of the reference code rate, a plurality of reference code rates of the to-be-coded video.

The apparatus according to claim 1, wherein the reference code rate obtaining module is configured to use, according to the first code rate, a code rate level of the first code rate, the second code rate, The code rate level of the second code rate is determined by using a preset formula to determine an index correspondence between a code rate level and a code rate;

The preset formula is: y = ^{α xl vide} ° - ^mte + ^b ;

Where y is the code rate level, video_rate is the reference code rate, α is the first constant, and b is the second constant.

The device according to claim 1, wherein the video transmission module comprises: a first video segment transmission unit, configured to transmit a first video segment according to a transmission request of the terminal to the encoded video, a video segment is a first reference code rate;

a transmission condition determining unit, configured to detect a transmission of the first video segment, and determine a current transmission condition of the terminal;

a second video segment determining unit, configured to determine, from a plurality of reference code rates of the encoded video, a second reference code rate, where the second reference code rate matches a current transmission condition of the terminal;

And a second video segment transmission unit, configured to select a second video segment of the second reference code rate, where the second video segment is a next segment of the first video segment.

The device according to claim 5, wherein when the first video segment is the first video segment to be transmitted in the encoded video, the first reference code rate is smaller than the terminal The requested code rate.

7. The device according to claim 1, wherein the device further comprises:

a play score obtaining module, configured to obtain a play rating of the encoded video in different play scenarios Playing a score to determine a score of a plurality of reference code rates;

a scoring standard deviation calculation module, configured to calculate a scoring standard deviation of the plurality of reference code rates according to the scores of the plurality of reference code rates;

Preferably, the reference code rate selection module is configured to select a preferred reference code rate from the plurality of reference code rates according to the standard deviation of the plurality of reference code rates and the quality evaluation value of the played video.

The apparatus according to claim 7, wherein the score determining module is further configured to: when the specified video segment is included in the encoded video played in the first scene, the first scene is The play score is a score of a reference code rate corresponding to the specified video segment, the specified video segment is a video segment having the same reference code rate, and the number of the specified video segments is greater than a preset number.

The apparatus according to claim 7, wherein the preferred reference rate selection module comprises: a correlation coefficient calculation unit, configured to calculate a score of the plurality of reference code rates and a quality evaluation value of the played video Correlation coefficient between

a code rate selection unit, configured to select a specified code rate from the plurality of reference code rates, where a standard deviation of the corresponding code rate is less than a first preset threshold, and a correlation coefficient corresponding to the specified code rate a maximum value of correlation coefficients corresponding to the plurality of reference code rates;

Preferably, a reference code rate determining unit is configured to use the specified code rate as the preferred reference code rate.

10. A video transmission method, the method comprising:

Obtaining video information of the video to be encoded and network transmission conditions, and determining a first code rate and a second code rate, where the first code rate is greater than the second code rate;

Determining the code rate of the reference code rate according to the historical play score and the preset gradient value of the second code rate Number of stages;

Acquiring, according to the first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate, a plurality of reference code rates of the to-be-coded video;

And encoding the to-be-encoded video according to the multiple reference code rates;

Video transmission is performed based on the video segments of the plurality of reference code rates obtained by the encoding.

The method according to claim 10, wherein determining the number of code rate levels of the reference code rate according to the historical play score and the preset gradient value of the second code rate comprises:

Calculating a difference between a historical play score of the preset score and the second code rate;

And dividing the difference according to the preset gradient to obtain a plurality of scoring intervals;

The number of the obtained score sections is taken as the number of code rate levels of the reference code rate.

The method according to claim 10, wherein, according to the first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate, Obtaining a plurality of reference code rates of the video to be encoded, including:

Determining, according to the number of code rate levels of the reference code rate, a code rate level of the first code rate; according to the first code rate, a code rate level of the first code rate, the second code rate, Determining a relationship between a code rate level and a code rate by a code rate level of the second code rate;

Obtaining a plurality of reference code rates of the video to be encoded according to the index correspondence and the code rate level of the reference code rate.

The method according to claim 10, wherein: according to the first code rate, a code rate level of the first code rate, the second code rate, and a code rate of the second code rate Level, determining the exponential correspondence between the code rate level and the code rate, including:

And applying a preset formula to determine a code rate level and a code rate according to the first code rate, the code rate level of the first code rate, the second code rate, and the code rate level of the second code rate. Index correspondence between them; The preset formula is: y = ^{α xl vide} ° - ^mte , + ^b ;

The method according to claim 10, wherein the video transmission is performed based on the encoded video segments of the plurality of reference code rates, including:

Transmitting a first video segment according to a transmission request of the terminal to the encoded video, where the first video segment is a first reference code rate;

Detecting transmission of the first video segment, determining a current transmission condition of the terminal;

Determining, from a plurality of reference code rates of the encoded video, a second reference code rate, where the second reference code rate matches a current transmission condition of the terminal;

And transmitting a second video segment of the second reference code rate, the second video segment being a next segment of the first video segment.

The method according to claim 14, wherein when the first video segment is the first video segment to be transmitted in the encoded video, the first reference code rate is smaller than the terminal The requested code rate.

The method according to claim 10, wherein after the video transmission is performed on the video segments of the plurality of reference code rates obtained by the encoding, the method further includes:

Obtaining a play score of the encoded video in different play scenarios; a score of multiple reference code rates;

Calculating a scoring standard deviation of the plurality of reference code rates according to the scores of the plurality of reference code rates; determining, according to the scoring standard deviation of the plurality of reference code rates, and the quality evaluation value of the played video, A preferred reference code rate is selected among a plurality of reference code rates.

17. The method according to claim 16, wherein determining a score of the plurality of reference code rates according to a reference code rate of each video segment included in the encoded video and the play score comprises: When the specified video clip is included in the played video, the play score in the first scene is used as the score of the reference code rate corresponding to the specified video clip, and the specified video clip is a video having the same reference code rate. a segment, and the number of the specified video segments is greater than a preset number.

The method according to claim 16, wherein the preferred reference is selected from the plurality of reference code rates according to a standard deviation of the plurality of reference code rates and a quality evaluation value of the played video. The code rate includes:

Calculating a correlation coefficient between a score of the plurality of reference code rates and a quality evaluation value of the played video;

Selecting a specified code rate from the plurality of reference code rates, the standard deviation of the corresponding code rate corresponding to the specified code rate is less than the first preset threshold, and the correlation coefficient corresponding to the specified code rate is the multiple reference code rate The maximum of the corresponding correlation coefficients;

The specified code rate is taken as the preferred reference code rate.