WO2017097151A1 - 一种转码方法及装置 - Google Patents
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Definitions
- the present application relates to the field of information processing technologies, and in particular, to a transcoding method and apparatus.
- Mobile streaming media is a combination of mobile communication and streaming media transmission.
- the mobile network uses streaming media technology for data transmission on the mobile terminal, providing users with services including video on demand, mobile video chat, mobile video surveillance and the like.
- Transcoding is to compress high-definition large media files (such as video files) into suitable network scenarios (such as fiber-optic network, WIFI network, 3G network, etc.) and some terminals (such as TV, PC, mobile phone, PAD, etc.).
- suitable network scenarios such as fiber-optic network, WIFI network, 3G network, etc.
- some terminals such as TV, PC, mobile phone, PAD, etc.
- the process of playing a file/stream Generally, the smaller the media file is compressed, the more suitable it is to transmit in a bandwidth-constrained environment, but the display quality of the media file may be worse.
- the existing transcoding method generally includes: the transcoding parameters corresponding to different definitions may be preset in advance, for example, the resolution may include: flow, standard definition, high definition, and ultra clear, and the four definitions may be respectively set. Resolution and bit rate.
- the media files are precoded and transcoded according to different resolutions according to the set resolution and the code rate. When the transcoding of the resolution is completed, the media files corresponding to the respective definitions may be output.
- the inventor has found that at least the following problems exist in the prior art: in the existing transcoding method, the transcoding parameters of the media file need to be analyzed before transcoding to determine an appropriate resolution and code. Rate and other transcoding parameters, then transcode according to the analyzed parameters and output the transcoded media files.
- the parameter analysis process takes a certain amount of time, when a media file needs to be transcoded into media files of different definitions. When parameter analysis is required for each resolution, it takes a lot of time and reduces the transcoding speed.
- the purpose of the embodiment of the present application is to provide a transcoding method and apparatus to improve the transcoding speed of a media file.
- the embodiment of the present application provides a transcoding method and device, which are implemented as follows:
- a transcoding method comprising:
- first real-time quantization parameter value does not meet the preset detection rule, adjusting a first resolution corresponding to the first resolution; and/or, if the second real-time quantization parameter value does not meet the pre- Setting a detection rule to adjust a second resolution corresponding to the second definition;
- a transcoding method comprising:
- a transcoding device includes: a correspondence relationship establishing module, a resolution and resolution determining module, a transcoding module, a first judging module, and a resolution first adjusting module;
- the corresponding relationship establishing module is configured to pre-establish a plurality of different correspondences between resolution and resolution;
- the definition and resolution determining module is configured to select a first definition and a second definition from the plurality of level definitions, and determine a first resolution corresponding to the first definition and the second definition respectively And a second resolution;
- the transcoding module is configured to transcode the first part of the media file according to the preset transcoding rule according to the first resolution and the second resolution, and record the first clearness in the transcoding process respectively a first real-time quantization parameter value corresponding to the second sharpness and a second real-time quantization parameter value;
- the first determining module is configured to determine whether the first real-time quantization parameter value and the second real-time quantization parameter value all meet the preset detection rule;
- the preset detection rule includes: obtaining, according to a resolution transcoding The number of the quantization parameter values of the real-time quantization parameter value that is greater than the first threshold is less than a% of the total number of real-time quantization parameters obtained by transcoding the resolution; the value range of the a includes: 30-70;
- the first adjustment module is configured to adjust the first corresponding to the first definition when the first prediction module determines that the first real-time quantization parameter does not meet the preset detection rule. a resolution; and/or for adjusting a second resolution corresponding to the second resolution when the determination result of the first determining module is that the second real-time quantization parameter does not meet the preset detection rule ;
- the transcoding module is further configured to transcode the untranscoded portion of the media file according to the adjusted first resolution and/or the adjusted second resolution of the resolution first adjustment module.
- a transcoding device includes: a resolution and resolution determining module, a transcoding module, a first judging module, and a resolution first adjusting module;
- the definition and resolution determining module is configured to select a first sharpness and a second sharpness from a plurality of levels of sharpness, and determine a first resolution corresponding to the first sharpness and the second sharpness, respectively.
- the transcoding module is configured to transcode the first part of the media file according to the preset transcoding rule according to the first resolution and the second resolution, and record the first clearness in the transcoding process respectively a first real-time quantization parameter value corresponding to the second sharpness and a second real-time quantization parameter value;
- the first determining module is configured to determine whether the first real-time quantization parameter value and the second real-time quantization parameter value all meet the preset detection rule;
- the preset detection rule includes: obtaining, according to a resolution transcoding The number of the quantization parameter values of the real-time quantization parameter value that is greater than the first threshold is less than a% of the total number of real-time quantization parameters obtained by transcoding the resolution; the value range of the a includes: 30-70;
- the first adjustment module is configured to adjust the first corresponding to the first definition when the first prediction module determines that the first real-time quantization parameter does not meet the preset detection rule. a resolution; and/or for adjusting a second resolution corresponding to the second resolution when the determination result of the first determining module is that the second real-time quantization parameter does not meet the preset detection rule ;
- the transcoding module is further configured to transcode the untranscoded portion of the media file according to the adjusted first resolution and/or the adjusted second resolution of the resolution first adjustment module.
- the method and device for transcoding provided by the embodiment of the present application can transcode part of the content of the media file according to a predetermined resolution corresponding to the resolution, before transcoding. It is not necessary to separately analyze the transcoding parameters of each definition, which saves the transcoding time and improves the transcoding speed. At the same time, in the process of transcoding, the change of the quantization parameter value is recorded. When the quantization parameter value is too large, the resolution may be adjusted in time, and the untranscoded portion of the media file is transcoded according to the adjusted resolution. It can guarantee that the transcoded media files can be played clearly and smoothly.
- FIG. 1 is a flow chart of an embodiment of a transcoding method of the present application
- FIG. 2 is a schematic diagram of adjusting a resolution by using a linear model in one embodiment of the transcoding method of the present application
- FIG. 3 is a block diagram of one embodiment of a transcoding device of the present application.
- the embodiment of the present application provides a transcoding method and device.
- the transcoding method may include the following steps.
- S101 Select a first definition and a second definition from a plurality of levels of definitions, and determine a first resolution and a second resolution respectively corresponding to the first definition and the second definition.
- the plurality of levels of sharpness may be at least 2 levels of sharpness. Correspondence between resolution and resolution of multiple levels can be set.
- the correspondence between the different resolutions and resolutions may be as shown in Table 1, wherein the plurality of The level of sharpness can be 4 levels of sharpness, from the highest level of clarity to the lowest level of clarity can be: ultra clear, high definition, standard definition, smooth.
- Table 1 each resolution and its corresponding resolution
- the first sharpness and the second sharpness may be selected from the plurality of levels of sharpness.
- the first sharpness may be any one of the 2 levels of sharpness
- the second sharpness may be another.
- the first sharpness and the second sharpness may be the highest level of sharpness among the plurality of levels of sharpness Any two levels of clarity other than that.
- the plurality of levels of sharpness may be, in order from the highest level of definition to the lowest level, of brightness: ultra clear, high definition, standard definition, and smooth. Then the first definition and the second definition may be sharpness of any two of "high definition", "standard definition” and "fluent".
- the first sharpness and the second sharpness may select sharpness of two levels that are not adjacent.
- the sharpness of the "HD” and “Smooth” levels can be selected separately.
- the first resolution and the second resolution respectively corresponding to the first sharpness and the second sharpness may be determined according to the correspondence relationship of the different definition pre-resolutions established in advance.
- S103 Transcode the first part of the media file according to the preset transcoding rule according to the first resolution and the second resolution, and record the transcoding process with the first definition and the second definition respectively. Corresponding first real-time quantization parameter value and second real-time quantization parameter value.
- the first part of the media file may be transcoded according to the preset transcoding rule according to the first resolution and the second resolution.
- the content of the first part of the media file may include: content of the first duration of the media file.
- the first duration may be less than a total duration of playing of the media file. For example, for a total duration of 30 minutes
- the video file the content of the first duration may be the content within 2 minutes of the current time.
- the preset transcoding rule may include encoding according to a fixed code rate coefficient (CRF) value or a fixed quantization parameter (QP) value.
- CRF code rate coefficient
- QP fixed quantization parameter
- a value of CRF of 18 indicates that the quality of the media file is basically lossless.
- a value of CRF of 19-21.5 indicates that the quality of the media file is high quality, and a value of C-26 of 22-26 indicates that the quality of the media file is medium quality.
- the preset code rate coefficient may be selected according to actual experimental conditions.
- the value of the CRF may be 25.
- the quantization parameter (QP) value may be used to measure the distortion/compression rate of the transcoded media file.
- QP The larger the QP value, the higher the distortion of the transcoded media file, and the higher the compression ratio; QP The smaller the value, the smaller the distortion of the transcoded media file and the lower the compression ratio.
- the value range of QP is generally 0 to 51.
- QP Quality of the media file
- a first real-time quantization parameter value and a second real-time quantization parameter value respectively corresponding to the first definition and the second definition may be recorded.
- S104 Determine whether the first real-time quantization parameter value and the second real-time quantization parameter value both meet a preset detection rule.
- the preset detection rule may include: a quantity of the quantization parameter value greater than the first threshold value of the real-time quantization parameter value obtained according to a resolution transcoding is smaller than a total of the real-time quantization parameter value obtained by transcoding the resolution according to the resolution a% of the number; the value range of a may include: 30-70.
- the real-time quantization parameter value is greater than the first threshold, it may be determined whether there is a case where the instantaneous code rate value is too high during the transcoding process.
- the first threshold may be the fixed quantization parameter value or a quantization parameter value corresponding to the fixed rate coefficient value.
- the first threshold may be: the preset rate coefficient value is increased by 5.
- the value of the quantization parameter obtained by the transcoding is greater than the first threshold, it may be stated that the instantaneous code rate value is greater than the maximum code rate value that the media file can smoothly play at the current resolution, if a certain number of instantaneous bit rates are exceeded. A value greater than the maximum code rate value may result in the media file not being able to play smoothly at the current resolution.
- S105 If the first real-time quantization parameter value does not meet the preset detection rule, adjust a first resolution corresponding to the first resolution; and/or, if the second real-time quantization parameter value does not match Determining a detection rule to adjust a second resolution corresponding to the second resolution.
- the instantaneous code rate of multiple segments of the media file may exceed the resolution when transcoding according to a preset transcoding rule at the current resolution.
- the maximum bit rate under the rate may cause the media files to not play smoothly. Therefore, it is necessary to reduce the resolution corresponding to the current sharpness.
- the adjusting the first resolution may include multiplying a value of the first resolution by a first coefficient.
- the adjusting the second resolution may include multiplying the value of the second resolution by the first coefficient.
- the value of the first coefficient may include: greater than 0 and less than 1.
- the first coefficient can be 0.8.
- S106 Transcode the untranscoded portion of the media file according to the adjusted first resolution and/or the adjusted second resolution.
- the untranscoded portion of the media file may be transcoded according to a preset transcoding rule, and the first clear and the first clear may be obtained.
- the method may further include: if the first real-time quantization parameter value and the second real-time quantization parameter value both meet the preset detection rule, according to the first resolution and the second resolution Rate transcodes the untranscoded portion of the media file.
- the number of quantization parameters greater than the first threshold may be represented as 0 or a small number.
- the method may further include: recording a first code rate and a second code rate respectively corresponding to the first definition and the second definition obtained by transcoding the first part of the content of the media file, according to A linear model is established with the first code rate, the second code rate, and the first resolution and the second resolution respectively corresponding to the first definition and the second definition.
- the plurality of levels of sharpness are at least 3 levels of sharpness, according to the linear mode And a resolution corresponding to each of the first level definition and the second definition, and a code rate value corresponding to the clarity of the other levels.
- a linear relationship between the resolution and the code rate may be calculated according to the first resolution, the second resolution, and the first code rate and the second code rate, and according to the linear relationship, the other levels may be calculated
- the resolution of the resolution corresponds to the code rate value.
- the code rate value corresponding to the resolution of each level is less than or equal to a preset upper limit code rate threshold corresponding to the resolution of the level; if the determination result is no, the multiple levels may be determined.
- a sharpness of the target level in which the code rate value is greater than the upper limit code rate threshold; and the upper limit code rate threshold corresponding to the sharpness of the target level and the linear model may determine the sharpness with the target level Corresponding adjusted resolution; the untranscoded portion of the media file may be transcoded according to the adjusted resolution.
- the linear model can be used to obtain the resolution matching the rate value of the media file that can be smoothly played under each level of definition, thereby ensuring that the transcoded media file can be played clearly and smoothly.
- B and E respectively represent the first resolution and the second resolution corresponding to "high definition” and “fluid” respectively obtained according to Table 1, wherein A represents the The resolution corresponding to the definition "super clear”, and D represents the resolution corresponding to the definition "standard definition” obtained according to Table 1.
- b represents the first code rate value obtained during the transcoding process, and e represents the second code rate value obtained during the transcoding process.
- a linear model can be established according to B, E, b, and e, and a linear relationship between resolution and code rate is obtained, as shown by line m in FIG.
- a code rate value a corresponding to the resolution A and a code rate value d corresponding to the resolution D can be obtained.
- a', b', d', and e' are preset bit rate thresholds corresponding to the definitions of "super clear”, “high definition”, “standard definition”, and "fluent”, then it can be judged that only d> D' indicates that if the media file resolution D is transcoded to achieve playback with the definition of "standard definition", the media file will not be played smoothly.
- a resolution D′ corresponding to the d′ can be obtained, and the D′ is used as the adjusted “standard definition”.
- the corresponding resolution when the untranscoded portion of the media file is transcoded according to the adjusted D', can ensure that the media file is played clearly and smoothly.
- the transcoding method provided by the foregoing embodiment performs transcoding on a part of the content of the media file according to a predetermined resolution corresponding to the resolution, and does not need to separately analyze the transcoding parameters of each definition before transcoding. , saving the transcoding time and improving the transcoding speed.
- the change of the quantization parameter value is recorded, and when the quantization parameter value is too large, the resolution can be adjusted in time and the untranscoded part of the media file is transcoded according to the adjusted resolution. And it can guarantee that the transcoded media files can be played clearly and smoothly.
- the transcoding device may include: a resolution and resolution determining module 301, a transcoding module 302, a first determining module 303, and a resolution first adjusting module 304. among them,
- the resolution and resolution determining module 301 can be configured to select a first sharpness and a second sharpness from a plurality of levels of sharpness, and determine a first resolution corresponding to the first sharpness and the second sharpness, respectively. Rate and second resolution.
- the plurality of levels of sharpness may be at least 2 levels of sharpness.
- a corresponding relationship establishing module can be used to set the correspondence between the resolution and the resolution of the plurality of levels.
- the transcoding module 302 may be configured to transcode the first part of the media file according to the preset transcoding rule according to the first resolution and the second resolution, and record the transcoding process respectively. a first real-time quantization parameter value corresponding to the sharpness and the second sharpness, and a second real-time quantization parameter value.
- the first determining module 303 can be configured to determine whether the first real-time quantization parameter value and the second real-time quantization parameter value both meet the preset detection rule.
- the preset detection rule may include: the number of the quantization parameters greater than the first threshold in the real-time quantization parameter value obtained by transcoding according to a resolution is smaller than the total number of real-time quantization parameters obtained by transcoding the resolution according to the resolution. a%; the value range of a may include: 30-70.
- the first adjustment module 304 may be configured to adjust the first resolution when the first determination module 303 determines that the first real-time quantization parameter does not meet the preset detection rule.
- the first resolution and/or may be used to adjust the second sharpness corresponding when the determination result of the first determining module 304 is that the second real-time quantization parameter does not meet the preset detection rule The second resolution.
- the transcoding module 302 may be further configured to perform, on the first resolution that is adjusted by the first adjustment module 304 by the resolution, and/or the second resolution that is adjusted, on the untranscoded portion of the media file. Transcode.
- the transcoding device may further include: a code rate recording module and a linear model building module.
- the code rate recording module may be configured to record, by the transcoding module, transcoding the first part of the media file. a first code rate and a second code rate respectively corresponding to the first definition and the second definition.
- the linear model establishing module may be configured to establish a linear model according to a first code rate, a second code rate, and a first resolution and a second resolution respectively corresponding to the first definition and the second definition.
- the transcoding device may further include another code rate determining module, which may be configured to use other levels than the first definition and the second definition according to the linear model and the plurality of levels of sharpness.
- the resolution corresponding to the sharpness determines a code rate value corresponding to the sharpness of the other levels.
- the transcoding device may further include: a second determining module.
- the second determining module may be configured to determine whether the code rate values corresponding to the sharpness of each level are less than or equal to a preset upper limit code rate threshold corresponding to the sharpness of the level.
- the transcoding device may further include: a target level definition determining module and a resolution second adjusting module; wherein
- the target sharpness module may be configured to determine a sharpness of a target level of the plurality of levels of sharpness that has a code rate value greater than the corresponding preset upper limit code rate threshold.
- the resolution second adjustment module may be configured to determine an adjusted resolution corresponding to the clarity of the target level according to an upper limit code rate threshold corresponding to the sharpness of the target level and the linear model.
- the transcoding module 303 is further configured to transcode the untranscoded portion of the media file according to the adjusted resolution of the resolution second adjustment module.
- the transcoding device disclosed in the above embodiment corresponds to the embodiment of the transcoding method of the present application, and the method embodiment of the present application can be implemented, and the technical effects of the method embodiment are obtained.
- PLD Programmable Logic Device
- FPGA Field Programmable Gate Array
- HDL Hardware Description Language
- the controller can be implemented in any suitable manner, for example, the controller can take the form of, for example, a microprocessor or processor and a computer readable medium storing computer readable program code (eg, software or firmware) executable by the (micro)processor.
- computer readable program code eg, software or firmware
- examples of controllers include, but are not limited to, the following microcontrollers: ARC 625D, Atmel AT91SAM, The Microchip PIC18F26K20 and the Silicone Labs C8051F320, the memory controller can also be implemented as part of the memory's control logic.
- the controller can be logically programmed by means of logic gates, switches, ASICs, programmable logic controllers, and embedding.
- Such a controller can therefore be considered a hardware component, and the means for implementing various functions included therein can also be considered as a structure within the hardware component.
- a device for implementing various functions can be considered as a software module that can be both a method of implementation and a structure within a hardware component.
- the system, device, module or unit illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product having a certain function.
- the present application can be implemented by means of software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application, which is essential or contributes to the prior art, can be embodied in the form of a software product, in a typical configuration.
- the computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
- the computer software product can include instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present application or portions of the embodiments.
- the computer software product can be stored in a memory, which may include non-persistent memory, random access memory (RAM), and/or nonvolatile memory in a computer readable medium, such as read only memory (ROM) or Flash memory.
- RAM random access memory
- ROM read only memory
- Memory is an example of a computer readable medium.
- Computer readable media includes both permanent and non-persistent, removable and non-removable media.
- Information storage can be implemented by any method or technology.
- the information can be computer readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory.
- PRAM phase change memory
- SRAM static random access memory
- DRAM dynamic random access memory
- RAM random access memory
- ROM read only memory
- EEPROM electrically erasable programmable read only memory
- flash memory or other memory technology
- compact disk read only memory CD-ROM
- DVD digital versatile disk
- Magnetic tape cartridges magnetic tape storage or other magnetic storage devices or any other non-transportable media can be used to store information that can be accessed by a computing device.
- computer readable media does not include transitory computer readable media, such as modulated data signals and carrier waves.
- This application can be used in a variety of general purpose or special purpose computer system environments or configurations.
- the application can be described in the general context of computer-executable instructions executed by a computer, such as a program module.
- program modules include routines, programs, objects, components, data structures, and the like that perform particular tasks or implement particular abstract data types.
- the present application can also be practiced in distributed computing environments where tasks are performed by remote processing devices that are connected through a communication network.
- program modules can be located in both local and remote computer storage media including storage devices.
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Abstract
Description
清晰度 | 分辨率 |
超清 | 1920×1080 |
高清 | 1280x720 |
标清 | 848×480 |
流畅 | 576x320 |
Claims (20)
- 一种转码方法,其特征在于,包括:预先建立多个不同的清晰度与分辨率的对应关系;从所述多个等级的清晰度中选择第一清晰度及第二清晰度,确定分别与第一清晰度及第二清晰度对应的第一分辨率及第二分辨率;根据所述第一分辨率和第二分辨率对媒体文件的第一部分内容按照预设的转码规则进行转码,记录所述转码过程中分别与第一清晰度、第二清晰度对应的第一实时量化参数值、第二实时量化参数值;判断所述第一实时量化参数值和第二实时量化参数值是否均符合预设检测规则;若所述第一实时量化参数值不符合所述预设检测规则,调整所述第一清晰度对应的第一分辨率;和/或,若所述第二实时量化参数值不符合所述预设检测规则,调整所述第二清晰度对应的第二分辨率;根据所述调整后的第一分辨率和/或调整后的第二分辨率对所述媒体文件中未转码的部分进行转码。
- 如权利要求1所述的一种转码方法,其特征在于,所述预设的转码规则包括:根据固定码率系数值或者固定量化参数值进行编码。
- 如权利要求2所述的一种转码方法,其特征在于,所述第一阈值为与所述固定码率系数值对应的量化参数值或者所述固定码率系数值。
- 如权利要求3所述的一种转码方法,其特征在于,当所述预设的转码规则为根据固定码率系数值进行编码时,所述量化参数值包括:所述固定码率系数值加5。
- 如权利要求1所述的一种转码方法,其特征在于,所述预设检测规则包括:根据一分辨率转码得到的实时量化参数值中大于第一阈值的量化参数值的数量小于所述根据该分辨率转码得到的实时量化参数总个数的a%;所述a的取值范围包括:30—70。
- 如权利要求1所述的一种转码方法,其特征在于,所述调整第一分辨率包括:将所述第一分辨率的值乘以第一系数,所述第一系数大于0且小于1。
- 如权利要求1所述的一种转码方法,其特征在于,所述调整第二分辨率包括:将所述第二分辨率的值乘以第一系数,所述第一系数大于0且小于1。
- 如权利要求1所述的一种转码方法,其特征在于,所述方法还包括:记录对媒体文件的第一部分内容转码得到的分别与第一清晰度、第二清晰度对应的第一码率和第二码率,根据与所述第一清晰度、第二清晰度分别对应的第一码率、第二码率和第一分辨率、第二分辨率建立线性模型。
- 如权利要求8所述的一种转码方法,其特征在于,当所述多个等级的清晰度包括至少3个等级的清晰度时,所述方法还包括:根据所述线性模型和所述多个等级的清晰度中除第一清晰度、第二清晰度以外其他各等级清晰度对应的分辨率,确定与所述其他各等级的清晰度对应的码率值。
- 如权利要求8或9所述的一种转码方法,其特征在于,所述方法还包括:判断每一等级的清晰度对应的码率值是否均小于或等于该等级的清晰度对应的预设的上限码率阈值;若判断结果为否,确定所述多个等级的清晰度中码率值大于所述上限码率阈值的目标等级的清晰度;根据所述目标等级的清晰度对应的上限码率阈值及所述线性模型,确定与所述目标等级的清晰度对应的调整后的分辨率;根据所述调整后的分辨率对所述媒体文件中未转码的部分进行转码。
- 如权利要求1所述的一种转码方法,其特征在于,当所述多个等级的清晰度包括至少3个等级的清晰度时,所述从多个等级的清晰度中选择第一清晰度及第二清晰度包括:选取所述多个等级的清晰度中除去最高等级的清晰度以外的任意两个等级的清晰度作为第一清晰度和第二清晰度。
- 如权利要求11所述的一种转码方法,其特征在于,当所述多个等级的清晰度为4个或4个以上等级的清晰度时,所述从多个等级的清晰度中选择第一清晰度及第二清晰度包括:所述第一清晰度和第二清晰度选取不相邻的两个等级的清晰度。
- 如权利要求1所述的一种转码方法,其特征在于,所述媒体文件的第一部分内容包括:所述媒体文件的第一时长的内容;所述第一时长小于所述媒体文件的播放总时长。
- 一种转码装置,其特征在于,所述装置包括:对应关系建立模块、清晰度和分辨率确定模块、转码模块、第一判断模块和分辨率第一调整模块;其中,所述对应关系建立模块,用于预先建立多个不同的清晰度与分辨率的对应关系;所述清晰度和分辨率确定模块,用于从所述多个等级清晰度中选择第一清晰度及第二清晰度,确定分别与第一清晰度及第二清晰度对应的第一分辨率及第二分辨率;所述转码模块,用于根据所述第一分辨率和第二分辨率对媒体文件的第一部分内容按照预设的转码规则进行转码,记录所述转码过程中分别与第一清晰度、第二清晰度对应的第一实时量化参数值、第二实时量化参数值;所述第一判断模块,用于判断所述第一实时量化参数值和第二实时量化参数值是否均符合所述预设检测规则;所述预设检测规则包括:根据一分辨率转码得到的实时量化参数值中大于第一阈值的量化参数值的数量小于所述根据该分辨率转码得到的实时量化参数总个数的a%;所述a的取值范围包括:30—70;所述分辨率第一调整模块,用于当所述第一判断模块的判断结果为所述第一实时量化参数不符合所述预设检测规则时,调整所述第一清晰度对应的第一分辨率;和/或,用于当所述第一判断模块的判断结果为所述第二实时量化参数不符合所述预设检测规则时,调整所述第二清晰度对应的第二分辨率;所述转码模块,还用于根据所述分辨率第一调整模块调整后的第一分辨率和/或调整后的第二分辨率对所述媒体文件中未转码的部分进行转码。
- 如权利要求14所述的一种转码装置,其特征在于,所述转码装置还包括:码率记录模块和线性模型建立模块;所述码率记录模块用于记录所述转码模块对媒体文件的第一部分内容转码得到的分别与第一清晰度、第二清晰度对应的第一码率和第二码率;所述显现模型建立模块用于根据与所述第一清晰度、第二清晰度分别对应的第一码率、第二码率和第一分辨率、第二分辨率建立线性模型。
- 如权利要求15所述的一种转码装置,其特征在于,所述转码装置还包括:其他码率确定模块,用于根据所述线性模型和所述多个等级的清晰度中除第一清晰度、第二清晰度以外其他各等级清晰度对应的分辨率,确定与所述其他各等级的清晰度对应的码率值。
- 如权利要求15所述的一种转码装置,其特征在于,所述转码装置还包括:第二判断模块;用于判断每个等级的清晰度对应的码率值是否均小于或等于该等级的清晰度对应的预设的上限码率阈值。
- 如权利要求17所述的一种转码装置,其特征在于,当所述第二判断模块的判断结果为否时,所述转码装置还包括:目标等级清晰度确定模块和分辨率第二调整模块;所述目标清晰度模块,用于确定所述多个等级的清晰度中码率值大于所述对应的预设上限码率阈值的目标等级的清晰度;所述分辨率第二调整模块,用于根据所述目标等级的清晰度对应的上限码率阈值及所述线性模型,确定与所述目标等级的清晰度对应的调整后的分辨率;相应地,所述转码模块还用于根据所述分辨率第二调整模块调整后的分辨率对所述媒体文件中未转码的部分进行转码。
- 一种转码方法,其特征在于,包括:从多个等级的清晰度中选择第一清晰度及第二清晰度,确定分别与第一清晰度及第二清晰度对应的第一分辨率及第二分辨率;根据所述第一分辨率和第二分辨率对媒体文件的第一部分内容按照预设的转码规则进行转码,记录所述转码过程中分别与第一清晰度、第二清晰度对应的第一实时量化参数值、第二实时量化参数值;判断所述第一实时量化参数值和第二实时量化参数值是否均符合预设检测规则;若所述第一实时量化参数值不符合所述预设检测规则,调整所述第一清晰度对应的第一分辨率;和/或,若所述第二实时量化参数值不符合所述预设检测规则,调整所述第二清晰度对应的第二分辨率;根据所述调整后的第一分辨率和/或调整后的第二分辨率对所述媒体文件中未转码 的部分进行转码。
- 一种转码装置,其特征在于,所述装置包括:清晰度和分辨率确定模块、转码模块、第一判断模块和分辨率第一调整模块;其中,所述清晰度和分辨率确定模块,用于从多个等级清晰度中选择第一清晰度及第二清晰度,确定分别与第一清晰度及第二清晰度对应的第一分辨率及第二分辨率;所述转码模块,用于根据所述第一分辨率和第二分辨率对媒体文件的第一部分内容按照预设的转码规则进行转码,记录所述转码过程中分别与第一清晰度、第二清晰度对应的第一实时量化参数值、第二实时量化参数值;所述第一判断模块,用于判断所述第一实时量化参数值和第二实时量化参数值是否均符合所述预设检测规则;所述预设检测规则包括:根据一分辨率转码得到的实时量化参数值中大于第一阈值的量化参数值的数量小于所述根据该分辨率转码得到的实时量化参数总个数的a%;所述a的取值范围包括:30—70;所述分辨率第一调整模块,用于当所述第一判断模块的判断结果为所述第一实时量化参数不符合所述预设检测规则时,调整所述第一清晰度对应的第一分辨率;和/或,用于当所述第一判断模块的判断结果为所述第二实时量化参数不符合所述预设检测规则时,调整所述第二清晰度对应的第二分辨率;所述转码模块,还用于根据所述分辨率第一调整模块调整后的第一分辨率和/或调整后的第二分辨率对所述媒体文件中未转码的部分进行转码。
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CN106856571A (zh) | 2017-06-16 |
EP3389275A4 (en) | 2019-05-29 |
EP3389275A1 (en) | 2018-10-17 |
US10645406B2 (en) | 2020-05-05 |
KR20180091829A (ko) | 2018-08-16 |
CN106856571B (zh) | 2019-12-06 |
US20180295371A1 (en) | 2018-10-11 |
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