CN103475900A - Method and device for packaging mobile phone television service video frame and front-end system - Google Patents
Method and device for packaging mobile phone television service video frame and front-end system Download PDFInfo
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Abstract
The embodiment of the invention provides a method and a device for packaging a mobile phone television service video frame and a front-end system. The method comprises the steps of sequentially determining each key frame included in a code stream output after video content of each channel is coded; and packaging and outputting a multiplexing sub frame where a key frame is located according to the position of the key frame, wherein the key frame is located in a first position of the multiplexing sub frame. The invention relates to the technical field of mobile communication and provides a solution for the problem that the channel switching time of a mobile phone television is too long.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to method for packing, device and the front end system of mobile phone TV services frame of video.
Background technology
Along with the development of China mobile multi-media broadcasting technology, can provide many video program contents for mobile phone users, such as news, sports cast, film, TV play etc., the user can watch at any time and appreciate these programme contents on mobile terminal.The channel quantity of Mobile Multimedia Broadcasting and number of users are also continuing to increase with very fast speed.At present, the standard of China mobile multi-media broadcasting technology is used widely, for example the digital video broadcast-handheld in Europe receives (DVB-H, Digital Video Broadcast Handheld), the single forward link of media (the Media FLO of the U.S., Media Forward Only) and Chinese China Mobile multimedia broadcasting (CMMB, China Mobile Multimedia Broadcast) etc.
The entire flow of China mobile multimedia advertisement service (mobile phone TV services) terminal completing channel switching at present comprises: closes old channel passage, receives the new channel content, and demultiplexing, deciphering, descrambling, buffered data, audio/video decoding, show output.Main encoder and the multiplexer of comprising of the broadcast head end system of mobile phone TV services: encoder is compressed original audio-video signal, converts the code stream that can store to; Multiplexer has been mainly Information encapsulation and the arrangements such as audio frequency, video, can on mobile multimedia broadcasting channel, transmit.The data flow such as the audio frequency and video of same channel are encapsulated in same multiplexed sub frame simultaneously.
As mentioned above, in the system of mobile phone TV services, after terminal is initiated the channel switching, need to wait for that the regular hour (being time of switching channels) just can receive the programme content of new channel.Because when channel switches, terminal must receive the key frame of this channel and just can be decoded, and the position of key frame in the encoder output code flow is unfixed, and the user must wait for that the arrival of key frame just can watch video.As shown in Figure 1, in Fig. 1, the black square means key frame, and white square means non-key frame.At present, the transmission means that the mobile phone TV services existing network adopts is: a channel sends the first-order multiplexes subframe in 1 second, within during Video coding 1 second, comprises a key frame, and key frame is unfixing in the position of multiplexed sub frame.Terminal starts to carry out the channel switching from time point t, and now the content of this channel of N+1 second has been sent, so can only receive the N+2 content of second, after receiving, terminal has experienced the stand-by period of 1 second; If the key frame of the video content of N+2 second is positioned at last position of its place multiplexed sub frame, because terminal need to cushion some frame of video that are positioned at the key frame back to guarantee the continuous broadcasting of video, therefore also need to continue to receive the N+3 video content of second, until the video content of N+3 second receives, now terminal has been waited for the time of 2 seconds.Adopt such scheme, the key frame that may cause terminal to receive this channel need to be waited for 2 seconds, and the time of terminal switching channels is relatively long.
In the mobile phone TV services standard, requiring is 6 seconds, adopts the channel handover scheme of prior art, and average channel handover delay generally is 4.3 seconds, and the channel change delay average out to of digital TV set-top box 2 seconds.Although existing mobile phone TV services can meet the minimum requirements of standard, but can affect the user, experience.This delay variation is mainly to cause due to above-mentioned transmission method that mobile TV adopts, and therefore shortening time of switching channels is the index that very important raising mobile phone TV services are experienced, and has become at present problem demanding prompt solution.
Summary of the invention
The embodiment of the present invention provides a kind of method for packing, device and front end system of mobile phone TV services frame of video, while in order to solve terminal, initiating the channel switching, and the problem of waits for too long.
The method for packing of a kind of mobile phone TV services frame of video that the embodiment of the present invention provides comprises:
To the output code flow after each channel video content coding, determine successively each key frame wherein comprised;
According to the position of each key frame, encapsulate multiplexed sub frame the output at this key frame place, above-mentioned key frame is positioned at first of multiplexed sub frame at place.
The embodiment of the present invention provides a kind of packaging system of mobile phone TV services frame of video, comprising:
The key frame determination module, for the output code flow to after each channel video content coding, determine each key frame wherein comprised successively;
Package module, for the position of each key frame of determining according to above-mentioned key frame determination module, encapsulate the multiplexed sub frame at this key frame place, and above-mentioned key frame is positioned at first of multiplexed sub frame at place;
Output module, for the multiplexed sub frame output by above-mentioned package module encapsulation.
The broadcast head end system of a kind of mobile phone TV services that the embodiment of the present invention provides, comprise encoder and multiplexer;
Above-mentioned encoder, for giving described multiplexer to each channel video content coding output code flow;
Above-mentioned multiplexer, comprise the packaging system of above-mentioned mobile phone TV services frame of video.
Method for packing, device and the front end system of the mobile phone TV services frame of video that the embodiment of the present invention provides, when the output code flow after each channel video content coding is carried out to the multiplexed sub frame encapsulation, no matter in output code flow, whether the GOP frame number is fixing, can both be transmitted by the first frame using key frame as multiplexed sub frame, make terminal when the Switch Video channel, can be decoded once receiving multiplexed sub frame at once, be made the video-see smoothness, shortened the stand-by period.And the method that the embodiment of the present invention is provided, device or front end system are applied in current mobile phone TV services, can transform under smaller prerequisite at the broadcast head end system equipment to mobile phone TV services, improving the user experiences, and the terminal of prior art is not needed to carry out any transformation, can support.
The accompanying drawing explanation
The schematic diagram that Fig. 1 is the transmission means that in prior art of the present invention, the mobile phone TV services existing network adopts;
The flow chart of the method for packing of the mobile phone TV services frame of video that Fig. 2 provides for the embodiment of the present invention;
The method for packing of the mobile phone TV services frame of video that Fig. 3 provides for the embodiment of the present invention is the flow chart fixedly the time at the GOP frame number;
The method for packing of the mobile phone TV services frame of video that Fig. 4 provides for the embodiment of the present invention is at the GOP frame number flow chart fixedly the time not;
The modular structure figure of the packaging system of the mobile phone TV services frame of video that Fig. 5 provides for the embodiment of the present invention;
The structure chart figure of the broadcast head end system of a kind of mobile phone TV services that Fig. 6 provides for the embodiment of the present invention;
Transmission means schematic diagram after the method for packing of the mobile phone TV services frame of video that the employing embodiment of the present invention that Fig. 7 provides for the embodiment of the present invention provides encapsulates frame of video.
Embodiment
Below in conjunction with Figure of description, the embodiment of method for packing, device and the front end system of the mobile phone TV services frame of video that the embodiment of the present invention is provided describes.
The method for packing of a kind of mobile phone TV services frame of video that the embodiment of the present invention provides as shown in Figure 2, specifically comprises the following steps:
S201, to the output code flow after each channel video content coding, determine successively each key frame wherein comprised;
S202, according to the position of above-mentioned each key frame of determining, encapsulate the multiplexed sub frame at this key frame place, each key frame all is positioned at first of multiplexed sub frame at its place;
S203, multiplexed sub frame packaged in S202 is exported successively.
For the method for packing of above-mentioned a kind of mobile phone TV services frame of video that the embodiment of the present invention provides is described better, below with two specific embodiments, describe.
Embodiment mono-:
As shown in Figure 3, to the original video stream of each channel, at first by encoder, it is encoded, the output code flow after being encoded.Encoder can be by corresponding coding parameter setting, and in the output code flow after making to encode, picture group (GOP, Group of Pictures) frame number is fixed value, and the cycle of GOP frame number equals the transmission cycle T of its place video channel multiplexed sub frame; The GOP frame number characterizes the frame number at interval between two key frames herein.The method for packing of the mobile phone TV services frame of video that the present embodiment one provides, the fixing situation for the GOP frame number, its flow process comprises the steps:
S301, to the output code flow after each channel video content coding, identify first comprised key frame, and be first key frame marker timestamp;
S302, every cycle T to described output code flow mark timestamp again; According to the position of each timestamp of above-mentioned mark, can determine that the frame that this timestamp is corresponding is key frame;
S303, encapsulate the multiplexed sub frame at above-mentioned key frame place,, in each cycle T, the frame of video that timestamp is corresponding, as first, is encapsulated as a multiplexed sub frame by the frame of video in described cycle T;
S304, multiplexed sub frame packaged in S303 is exported successively.
Embodiment bis-:
As shown in Figure 4, encoder can be by corresponding coding parameter setting, and in the output code flow after making to encode, the GOP frame number is fixing.The method for packing of the mobile phone TV services frame of video that the embodiment of the present invention two provides, for the unfixed situation of this GOP frame number, its flow process comprises the steps:
S401, whether each frame of the output code flow after each channel video content coding is identified be key frame;
S402, encapsulate the multiplexed sub frame at this key frame place, the frame even identified in S401 is key frame, this key frame and this key frame are encapsulated in a multiplexed sub frame successively to all non-key frame between next key frame, and guarantee that this key frame is positioned at first of packaged multiplexed sub frame;
S403, multiplexed sub frame packaged in S402 is exported successively.
Whether the frame of video in the output code flow after above-mentioned recognition coding is that the method for key frame belongs to prior art, again repeats no more.
Based on same inventive concept, the embodiment of the present invention also provides a kind of packaging system of mobile phone TV services frame of video and the broadcast head end system of mobile phone TV services, because the principle that these devices are dealt with problems with system is similar to the method for packing of aforementioned a kind of mobile phone TV services frame of video, therefore the enforcement of this device and system can, referring to the enforcement of preceding method, repeat part and repeat no more.
The packaging system of a kind of mobile phone TV services frame of video that the embodiment of the present invention provides as shown in Figure 5, specifically comprises:
Key frame determination module 501, for the output code flow to after each channel video content coding, determine each key frame wherein comprised successively;
Further, if in the output code flow after each channel video content coding, the GOP frame number is fixed value, and the cycle of GOP frame number equals the transmission cycle T of its place video channel multiplexed sub frame, above-mentioned key frame determination module 501, for above-mentioned output code flow is identified to first comprised key frame, and it is described first key frame marker timestamp; After this, every cycle T to above-mentioned output code flow mark timestamp again; According to the position of each timestamp, can determine that the frame that this timestamp is corresponding is key frame;
Accordingly, above-mentioned package module 502, in each cycle T, the frame of video that timestamp is corresponding, as first, is encapsulated as a multiplexed sub frame by the frame of video in described cycle T;
Above-mentioned output module 503, export successively for the multiplexed sub frame by the package module encapsulation.
Further, if in the output code flow after each channel video content coding, the GOP frame number is fixing, above-mentioned key frame determination module 501, whether for each frame to above-mentioned output code flow, all identified is key frame;
Accordingly, above-mentioned package module 502, if identifying a certain frame for above-mentioned key frame determination module is key frame, this key frame and this key frame are encapsulated in a multiplexed sub frame successively to all non-key frame between next key frame, and guarantee that this key frame is positioned at first of this multiplexed sub frame.
Above-mentioned output module 503, export successively for the multiplexed sub frame by the package module encapsulation.
The embodiment of the present invention also provides a kind of broadcast head end system of mobile phone TV services, as shown in Figure 6, comprises encoder 601 and multiplexer 602; Wherein:
Below in conjunction with the accompanying drawing explanation, after method for packing, device and the front end system of the above-mentioned mobile phone TV services frame of video that adopts the embodiment of the present invention to provide, the operation principle that the encapsulation of mobile phone TV services frame of video and arrangement are transmitted, as shown in Figure 7, in Fig. 7, the black square means key frame, and white square means non-key frame:
Suppose that a channel sends the first-order multiplexes subframe in 1 second, i.e. transmission cycle T=1 second of this channel multiplexed sub frame, during Video coding, per second comprises a key frame, different from prior art (as shown in Figure 1) is, key frame is encapsulated in first of multiplexed sub frame: t be constantly N+1 while finishing second terminal start switching channels, now the channel content of the multiplexed sub frame transmission of N+1 second has been sent; Terminal starts to receive the N+2 multiplexed sub frame of second, because the first frame of this multiplexed sub frame is key frame, like this when terminal is carried out the channel switching, after the multiplexed sub frame that receives N+2 second is the content of new channel, just can decode immediately, does not need to wait for; Terminal continue to receive the N+3 multiplexed sub frame of second, because the first frame of this multiplexed sub frame is key frame, to the video content of this frame, can decode immediately, does not need to wait for.Hence one can see that, after adopting the method for packing of a kind of mobile phone TV services frame of video of the present invention, when terminal Switch Video channel, can see glibly video content, and not need to wait at once.Compare with the transmission means that the mobile phone TV services existing network shown in Fig. 1 adopts, reduced by the stand-by period of 2 seconds for the user and greatly improved user's experience.
Method for packing, device and the front end system of the mobile phone TV services frame of video that the embodiment of the present invention provides, when the output code flow after each channel video content coding is carried out to the multiplexed sub frame encapsulation, no matter in output code flow, whether the GOP frame number is fixing, can both be transmitted by the first frame using key frame as multiplexed sub frame, make terminal when the Switch Video channel, can be decoded once receiving multiplexed sub frame at once, be made the video-see smoothness, shortened the stand-by period.And the method that the embodiment of the present invention is provided, device or front end system are applied in current mobile phone TV services, can transform under smaller prerequisite at the broadcast head end system equipment to mobile phone TV services, improving the user experiences, and the terminal of prior art is not needed to carry out any transformation, can support.
Through the above description of the embodiments, those skilled in the art can be well understood to the embodiment of the present invention and can realize by hardware, and the mode that also can add necessary general hardware platform by software realizes.Understanding based on such, the technical scheme of the embodiment of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, or the network equipment etc.) carry out the described method of each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (7)
1. the method for packing of a mobile phone TV services frame of video, is characterized in that, comprising:
To the output code flow after each channel video content coding, determine successively each key frame wherein comprised;
According to the position of each key frame, encapsulate multiplexed sub frame the output at this key frame place, described key frame is positioned at first of multiplexed sub frame at place.
2. the method for claim 1, is characterized in that,
In output code flow after described each channel video content coding, picture group GOP frame number is fixed value, and in described output code flow the cycle of GOP frame number equal the transmission cycle T of its place channel multiplexed sub frame; Described GOP frame number characterizes the frame number at interval between adjacent two key frames;
To the output code flow after described each channel video content coding, determine successively each key frame wherein comprised, specifically comprise: the output code flow to after each channel video content coding, identify first comprised key frame, and be described first key frame marker timestamp;
After being described first key frame marker timestamp, every cycle T to described output code flow mark timestamp again;
According to the position of each timestamp, determine that the frame that this timestamp is corresponding is key frame;
Encapsulate the multiplexed sub frame at this key frame place, specifically comprise: in each cycle T, the frame of video that timestamp is corresponding, as first, is encapsulated as a multiplexed sub frame by the frame of video in this cycle T.
3. the method for claim 1, is characterized in that,
In output code flow after described each channel video content coding, the GOP frame number is fixed value not;
To the output code flow after described each channel video content coding, determine successively each key frame wherein comprised, specifically comprise: respectively key frame is identified and determined whether it is to each frame of described output code flow;
Encapsulate the multiplexed sub frame at this key frame place, specifically comprise: if identify described frame, be key frame, the described key frame and this key frame that identify are encapsulated in a multiplexed sub frame to all non-key frame between next key frame, and described key frame is positioned at first of multiplexed sub frame of encapsulation.
4. the packaging system of a mobile phone TV services frame of video, is characterized in that, comprising:
The key frame determination module, for the output code flow to after each channel video content coding, determine each key frame wherein comprised successively;
Package module, for the position of each key frame of determining according to described key frame determination module, encapsulate the multiplexed sub frame at this key frame place, and described key frame is positioned at first of multiplexed sub frame at place;
Output module, for the multiplexed sub frame output by described package module encapsulation.
5. the packaging system of mobile phone TV services frame of video as claimed in claim 4, it is characterized in that, if in the output code flow after described each channel video content coding, the GOP frame number is fixed value, and in described output code flow the cycle of GOP frame number equal the transmission cycle T of its place video channel multiplexed sub frame
Described key frame determination module specifically for described output code flow being identified to first comprised key frame, and is described first key frame marker timestamp; After this, every cycle T to described output code flow mark timestamp again; According to the position of each timestamp, determine that the frame that this timestamp is corresponding is key frame;
Described package module, specifically in each cycle T, the frame of video that timestamp is corresponding, as first, is encapsulated as a multiplexed sub frame by the frame of video in described cycle T.
6. the packaging system of mobile phone TV services frame of video as claimed in claim 4, is characterized in that, if in the output code flow after described each channel video content coding, the GOP frame number is unfixing,
Described key frame determination module, specifically for identifying and determine whether it is key frame each frame of described output code flow respectively;
Described package module, if be key frame specifically for identifying described frame, the described key frame and this key frame that identify are encapsulated in a multiplexed sub frame to all non-key frame between next key frame, and described key frame is positioned at first of multiplexed sub frame of encapsulation.
7. the broadcast head end system of mobile phone TV services, is characterized in that, comprises encoder and multiplexer;
Described encoder, for giving described multiplexer to each channel video content coding output code flow;
Described multiplexer, comprise the packaging system as the described mobile phone TV services frame of video of claim 4-6 any one.
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| CN2012101853619A CN103475900A (en) | 2012-06-06 | 2012-06-06 | Method and device for packaging mobile phone television service video frame and front-end system |
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| CN113891019A (en) * | 2021-09-24 | 2022-01-04 | 深圳Tcl新技术有限公司 | Video encoding method, video encoding device, shooting equipment and storage medium |
| CN117156223A (en) * | 2023-10-31 | 2023-12-01 | 中央广播电视总台 | Real-time stream switching method, device, electronic equipment and storage medium |
| CN117156223B (en) * | 2023-10-31 | 2024-03-15 | 中央广播电视总台 | Real-time stream switching method, device, electronic equipment and storage medium |
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Application publication date: 20131225 |