CN101945285A - Embedded interactive application service transcoding and encoding system - Google Patents
Embedded interactive application service transcoding and encoding system Download PDFInfo
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- CN101945285A CN101945285A CN 201010297477 CN201010297477A CN101945285A CN 101945285 A CN101945285 A CN 101945285A CN 201010297477 CN201010297477 CN 201010297477 CN 201010297477 A CN201010297477 A CN 201010297477A CN 101945285 A CN101945285 A CN 101945285A
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Abstract
The invention discloses an embedded interactive application service transcoding and encoding system, which belongs to the field of embedded application development and the field of digital television interactive application development. The system comprises a transcoding device, wherein the transcoding device further comprises a decoder and an encoder which are directly cascaded, and input data is decoded by the decoder and then transmitted to the encoder to be encoded; and the transcoding device has a closed loop control structure and is used for code rate conversion, resolution ratio conversion and standard conversion. Based on the system, a code stream can be converted into a code stream form which is suitable to be transmitted in different networks and meets the requirements of different video devices and different user terminals, so that the compatibleness among digital video systems of different encoding standards in different application environments can be realized, and the interaction and integration among multimedia resources of different formats can be realized.
Description
Technical field
The present invention relates to technical field of telecommunications, be specifically related to multiple code conversion technology in a kind of digital television interaction application and development.
Background technology
After the television system digitlization, will the trend that telecommunications network, cable television network and computer network merge mutually appear.Therefore, can occur the situation of mutual exchanging program between them inevitably, but the grammer of the encoding code stream of different video compression standards, semantic different need be changed to coded bit stream.Performance, volume and power consumption etc. that different Video Applications is deposited form, the network bandwidth and Video Codec to video data all have different requirements, and the coding standard that uses at different field also is not quite similar thus.For make between the heterogeneous network, can seamless link between the different access device and between the different multimedia data format, just need use transcoding technology at interface.For example: in video on-demand system, video server satisfies the request of different user by trans-coding system; In digital broadcasting, can finish transcoding by set-top box or gateway device, make the different multimedia terminal all can receiving digital broadcast.Except that general multimedia visit, Video Transcoding Technology also can be applicable to the compound transmission of multi-path video stream, the control code check makes it satisfy the restriction of channel width, in compressing video frequency flow, increase logo, watermark and anti-bit error performance, also very useful to the support and the video request program of the F.F. of digital video, playback isotype.Oneself becomes one of core technology of network multimedia transmission video code conversion.
But transcoder adopted the cascade open loop structure in the past, targetedly input code flow was transformed into the form that needs, and the conversion kind is single, and the calculation resources, the memory resource that take are bigger, and transcoding efficiency is not high.
Summary of the invention
In view of this, the invention provides a kind of embedded interactive application service changes coded system, and its purpose is to reduce the transcoding operand, improves transcoding efficiency, and the variation of conversion kind.
According to above-mentioned purpose, technical scheme of the present invention is achieved in that a kind of embedded interactive application service commentaries on classics coded system, this system comprises a transcoding device, this transcoding device further comprises decoder and encoder, the direct cascade of described encoder, described decoder is sent into encoder to input again after the data decode and is encoded; Described transcoding device adopts closed loop controlling structure, is used for code check conversion, conversion of resolution and standard handovers three classes.
Further, when described transcoding device is used for standard handovers, described transcoding device adopts closed loop controlling structure to be specially: preserve when decoding and obtain coded message, with the output code flow parameter as feedback control parameters, constantly coded message is carried out Correction and Control, reduce residual error gradually, constitute a self-adapting closed loop control system.
Further, when described transcoding device is used for the code check conversion, the motion vector correction technique is at first decoded to source code flow, obtain parameters such as motion vector, coding mode, then at coding side, the macroblock parameters that decoding obtains is reused, and just no longer carries out estimation and model selection when secondary coding.
Further, in the code check conversion, introduce the motion compensation computing.
Further, utilization motion vector mapping algorithm in conversion of resolution carries out closed-loop control with the feedback of coded bit stream and output frame buffer memory as the transcoding Control Parameter.
Further, the closed-loop structure transcoder is introduced the thought of block encoding in standard handovers, decoded information is utilized again, reused from the motion vector that decoding end obtains, reused from the motion vector that decoding end obtains, coding side only need be done the search among a small circle of limited ground, readjustment code check closed loop control algorithm and bit rate closed loop control algorithm on the current motion vector that obtains.
The present invention proposes a kind of embedded interactive application service and change coded system, it is the important component part that Digital Television is used for interactive application service field video code conversion, it adopts closed-loop structure, the output of code stream is fed back as the input of coding Control Parameter, have self-regulating function, a kind of video data of Standards and formats can be processed into the video data that more is adapted to the another kind of Standards and formats of certain application-specific.The input and output of transcoder all are the video flowings after the compression, the inhomogeneity video code conversion that requires that code stream behind the transcoding more can adapt to transmission bandwidth and receiving terminal is to convert video code flow the code stream of another kind of video encoding standard to from a certain coding standard, satisfies the interoperability between the different video coding standard system.Can be used for code check conversion, conversion of resolution and standard handovers.
Closed-loop structure transcoder algorithm is to utilize source code flow to decode to obtain parameters such as motion vector, coding mode to be reused in code check conversion, has effectively controlled error diffusion, has formed closed-loop control; The closed-loop structure transcoder is the parameter that is restricted to the requirement of satisfying the user and transmission bandwidth in conversion of resolution, and utilization motion vector mapping algorithm carries out closed-loop control with the feedback of coded bit stream and output frame buffer memory as the transcoding Control Parameter; The closed-loop structure transcoder is introduced the thought of block encoding in standard handovers, preserve when utilizing decoding and obtain coded message (as motion vector, frame encoding mode, macro-block coding pattern etc.) and revise with input parameter, if to resolution, Rate Control will introduce in the code check conversion that closed-loop structure transcoder algorithm forms closed-loop control in the closed-loop structure transcoder algorithm and conversion of resolution.
, the present invention adopts closed loop transcoding structure, goes for multiple transcoding type, greatly reduces based on the memory resource of transcoder of the present invention, and algorithm complex and operand are also lower, can overcome error drift, and the quality of image is greatly improved.Can be transformed into based on code stream of the present invention and to be suitable for heterogeneous networks transmission, satisfy the code stream form of different video equipment and different user terminals requirement, thereby realize the compatibility between the Digital Video System of different coding standard in the different application environment, realize mutual and integrated between the different-format multimedia resource.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is that the coded system block diagram is changeed in the interactive application service of the embodiment of the invention;
Fig. 2 is that the coded system flow chart is changeed in the interactive application service of the embodiment of the invention;
Fig. 3 is the transcoding gateway figure of the embodiment of the invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, below lift specific embodiment and, the present invention is described in more detail with reference to accompanying drawing.
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making all other embodiment that obtained under the creative work prerequisite.
As shown in Figure 1, be the interactive application service commentaries on classics coded system block diagram of the embodiment of the invention.It is to utilize the feedback parameter of output code flow and input code flow parameter as the transcoding Control Parameter, realizes the closed-loop control of trans-coding system, goes for multiple transcoding mode.
The simplest transcoder is exactly with decoder and the direct cascade of encoder, and decoder is sent into encoder to input again after the data decode and encoded.Yet this mode amount of calculation is too big, and impracticable.Here we adopt the trans-coding system of closed loop, go for code check conversion, conversion of resolution and standard handovers.
Closed-loop structure transcoder algorithm is the combination to partial decoding of h and part coding in the code check conversion.At first source code flow is decoded, obtain parameters such as motion vector, coding mode, at coding side, the macroblock parameters that decoding obtains is reused, and just no longer carries out estimation and model selection when secondary coding then, can reduce a large amount of computings like this, introduce the motion compensation computing, also effectively controlled error diffusion thus, overcome the problem that there is image drift in open loop structure, picture quality behind the transcoding is more satisfactory, improves code efficiency.
The closed-loop structure transcoder is that spatial resolution and temporal resolution are carried out the closed loop conversion in conversion of resolution, with the requirement of satisfying the user and the restriction of transmission bandwidth, utilization motion vector mapping algorithm carries out closed-loop control with the feedback of coded bit stream and output frame buffer memory as the transcoding Control Parameter.
The closed-loop structure transcoder is introduced the thought of block encoding in standard handovers, and decoded information is utilized again, improves transcoding efficiency.When decoding, preserve and obtain coded message (as motion vector, frame encoding mode, macro-block coding pattern etc.), then these information are revised by output feedback and input parameter, directly use corrected information in the secondary coding process, no longer again, carry out processing such as estimation and model selection, so just can significantly reduce amount of calculation.In compression domain, the motion vector information that input video stream is comprised multiplexing will be brought the problem that prediction and residual error can not fine coupling, so also needed motion vector is done further correction, promptly continues to do (half-pix) estimation in certain hunting zone.The motion estimation search window does not need very big, obtained under the motion vector prerequisite preceding, can obtain the optimal motion vector very soon, corresponding residual error is also littler, these extra parameter corrected Calculation can be the keys of transcoder design, revised parameter correctness directly has influence on the quality of image behind the transcoding, if in standard handovers, also to the resolution of video image, code checks etc. have requirement, will add in the code check conversion closed-loop structure transcoder algorithm in the closed-loop structure transcoder algorithm and conversion of resolution.
Compare with the codec cascade structure, the operand of closed loop transcoding structure reduces greatly.Estimation partly is the part that consumes calculation resources most, can account for more than 60% of total coding time usually.When using closed loop transcoding structure, to be reused from the motion vector that decoding end obtains, coding side only need be done the search among a small circle of limited ground on the current motion vector that obtains.Simultaneously, closed loop transcoding structure is also outstanding than codec cascade structure on picture quality, bit rate.Main cause wherein is that information such as the quantization parameter, macroblock encoding type of original video stream are directly used in the recodification process.For example, the quantization parameter that encoder use decoding obtains limits the quantization parameter of actual coding as the reference of the quantization parameter of actual coding with this.
As shown in Figure 2, be the interactive application service commentaries on classics coded system flow chart of the embodiment of the invention.Transform coding software is from reading coded file and carrying out corresponding initialization from Parameter File, from coded file, obtain necessary coding parameter (output code form, frame per second etc.) then, judge whether then to carry out the processing of next frame, if unwanted words, just finish conversion, the words that need just begin decoding to this frame.After finishing, decoding sees whether this frame needs to abandon, abandon if desired and then carry out motion vector and optimization process, handle next frame again, otherwise give present frame distribute data space and carry out corresponding Correction and Control, the Correction and Control parameter is encoded after correction is finished from the combination of input parameter and output feedback parameter, and judge whether to satisfy the transcoding requirement, satisfied then handle next frame, continue to revise otherwise jump to the Correction and Control place again, this has just finished the whole transcoding process of a frame.
Be the enforcement illustration of transcoding gateway system as shown in Figure 3, the transcoding gateway system is according to the transcoding parameter of control module input and the feedback parameter of output code flow, call different functional modules and carry out the transform coding processing, these processing mainly comprise: code stream format conversion, bit rate conversion, conversion of resolution, scan pattern conversion, anti-interference conversion, mistake processing etc.
The code stream format conversion: the code stream format conversion mainly is that the video encoding standard of following owing to input code flow and the code stream that terminal is supported is different, can adopt the Moving Picture Experts Group-2 content encoded be converted to the form of MPEG-4 coding in DVD and the digital broadcasting as typical MPEG-2 to the transcoding of MPEG-4, thereby satisfy the requirement of network-multimedia application, H.264 the coding standard of this trans-coding system support conversion input video code stream comprises that H.263 (+), MPEG-2 and MPEG-4 are in the conversion of interior coded format.
Conversion of resolution, bit rate conversion are used for the transcoding in the same or similar bit stream syntax more.Conversion of resolution is divided into temporal resolution transcoding (frame per second conversion) and spatial resolution transcoding (image resolution ratio conversion) again.Carrying out conversion of resolution mainly is in order to satisfy some restrictions on processing capability in real time, decoding capability, display resolution of user side decoder.For example: the program of high definition can be watched or write down to the transcoding from HDTV to SDTV on the equipment of supporting SDTV.The bit rate conversion is mainly used in digital broadcasting and Network Transmission, guarantees the compatibility between a specific order in the digital broadcasting, and saves bandwidth as much as possible.
Spatial resolution conversion: the size that changes frame of video according to targeted customer's configuration, for example, because computing capability and memory space are limited, be difficult to reach the display resolution of digital TV in high resolution, if the frame size of source video flowing greater than the receptible frame size of targeted customer, just need become to have the more code stream of low spatial resolution with the source video stream transcoding.
The temporal resolution conversion: the terminal video equipment that has can only come displaying video with lower frame per second, receives and play the video image of high frame per second originally if desired, just must carry out frame rate conversion.
The bit rate conversion: video code translator can change the bit rate of video flowing according to the bandwidth constraints of connecting channel.For satisfying the Network Transmission of low bandwidth, need be that the cost video flowing that bit rate is higher is converted to the lower video flowing of bit rate to reduce picture quality.Video code translator is also supported the conversion of VBR to CBR.
The scan pattern conversion: the scan pattern conversion can realize interlacing scan and the mutual conversion of lining by line scan.In commerce is used; adopt different scan modes through regular meeting; usually use the display mode of lining by line scan to remove to watch interlaced scanning video at the video place,, improve the vertical resolution of display image because suitable be interlaced to the progressive scanning conversion algorithm and can reduce the line flicker phenomenon.Here be the image that utilizes the adaptive interpolation algorithm that interleaved image transcoding is become to line by line scan.On the other hand, by extracting its odd-numbered line and even number line, an image sequence of lining by line scan can be divided into two interleaved images easily.
Anti-interference conversion: become literal, text conversion to become 3-D view, insert digital watermarking etc. speech conversion, improved the noiseproof feature of code stream so effectively, protected the copyright of serving manufacturer.
Mistake is handled: for the higher channel of the error rate, transcoder can effectively detect the error code in the video flowing in the video code flow decode procedure, and carries out suitable mistake and recover.In the video flowing cataloged procedure, transcoder will use suitable mistake to suppress mechanism according to the regulation of different video encoding and decoding standard, improve the fault freedom of output video code stream.
More than to the embodiment of the invention provided a kind of embedded interactive application service change coded system and be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand core concept of the present invention; Simultaneously; for one of ordinary skill in the art; according to thought of the present invention; part in specific embodiments and applications all can change; in sum; the content here should not be construed as limitation of the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. coded system is changeed in an embedded interactive application service, this system comprises a transcoding device, this transcoding device further comprises decoder and encoder, the direct cascade of described encoder, and described decoder is sent into encoder to input again after the data decode and is encoded;
It is characterized in that: described transcoding device adopts closed loop controlling structure, is used for code check conversion, conversion of resolution and standard handovers three classes.
2. coded system is changeed in a kind of embedded interactive application service according to claim 1, it is characterized in that: when described transcoding device is used for standard handovers, described transcoding device adopts closed loop controlling structure to be specially: preserve when decoding and obtain coded message, with the output code flow parameter as feedback control parameters, constantly coded message is carried out Correction and Control, reduce residual error gradually, constitute a self-adapting closed loop control system.
3. coded system is changeed in a kind of embedded interactive application service according to claim 1, it is characterized in that: when described transcoding device is used for the code check conversion, the motion vector correction technique is at first decoded to source code flow, obtain parameters such as motion vector, coding mode, then at coding side, the macroblock parameters that decoding obtains is reused, and just no longer carries out estimation and model selection when secondary coding.
4. coded system is changeed in a kind of embedded interactive application service according to claim 3, it is characterized in that: adopt the motion compensation computing in the code check conversion.
5. coded system is changeed in a kind of embedded interactive application service according to claim 1, it is characterized in that: utilization motion vector mapping algorithm in conversion of resolution, carry out closed-loop control with the feedback of coded bit stream and output frame buffer memory as the transcoding Control Parameter.
6. coded system is changeed in a kind of embedded interactive application service according to claim 2, it is characterized in that: the closed-loop structure transcoder is introduced the thought of block encoding in standard handovers, decoded information is utilized again, reused from the motion vector that decoding end obtains, reused from the motion vector that decoding end obtains, coding side only need be done the search among a small circle of limited ground, readjustment code check closed loop control algorithm and bit rate closed loop control algorithm on the current motion vector that obtains.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103051926A (en) * | 2011-09-30 | 2013-04-17 | 美国博通公司 | Streaming transcoder with adaptive upstream and downstream transcode coordination |
| CN103826138A (en) * | 2014-03-12 | 2014-05-28 | 赛特斯信息科技股份有限公司 | System and method for realizing cloud transcoding on various code rates and encoding formats of audio and video contents |
| CN106470340A (en) * | 2015-08-14 | 2017-03-01 | 华平智慧信息技术（深圳）有限公司 | A kind of secondary video data-encoding scheme and system |
| CN108881818A (en) * | 2017-11-02 | 2018-11-23 | 北京视联动力国际信息技术有限公司 | A kind of transmission method and device of video data |
| CN109120966A (en) * | 2018-08-30 | 2019-01-01 | 广州珠江数码集团股份有限公司 | A kind of method and device and system of 4K program request intelligent decision identification code rate |
| CN109803146A (en) * | 2019-04-04 | 2019-05-24 | 网易（杭州）网络有限公司 | The second-compressed method and apparatus of video |
| CN111026659A (en) * | 2019-12-05 | 2020-04-17 | 南开大学 | Mobile application callback analysis research method based on embedded representation |
| CN111225211A (en) * | 2018-11-27 | 2020-06-02 | 北京达佳互联信息技术有限公司 | Transcoding method, transcoding device and computer readable storage medium |
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2010
- 2010-09-29 CN CN 201010297477 patent/CN101945285A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103051926A (en) * | 2011-09-30 | 2013-04-17 | 美国博通公司 | Streaming transcoder with adaptive upstream and downstream transcode coordination |
| CN103826138A (en) * | 2014-03-12 | 2014-05-28 | 赛特斯信息科技股份有限公司 | System and method for realizing cloud transcoding on various code rates and encoding formats of audio and video contents |
| CN106470340A (en) * | 2015-08-14 | 2017-03-01 | 华平智慧信息技术（深圳）有限公司 | A kind of secondary video data-encoding scheme and system |
| CN108881818A (en) * | 2017-11-02 | 2018-11-23 | 北京视联动力国际信息技术有限公司 | A kind of transmission method and device of video data |
| CN109120966A (en) * | 2018-08-30 | 2019-01-01 | 广州珠江数码集团股份有限公司 | A kind of method and device and system of 4K program request intelligent decision identification code rate |
| CN109120966B (en) * | 2018-08-30 | 2020-10-09 | 广州珠江数码集团股份有限公司 | Method, device and system for intelligently judging and identifying code rate of 4K video-on-demand |
| CN111225211A (en) * | 2018-11-27 | 2020-06-02 | 北京达佳互联信息技术有限公司 | Transcoding method, transcoding device and computer readable storage medium |
| CN109803146A (en) * | 2019-04-04 | 2019-05-24 | 网易（杭州）网络有限公司 | The second-compressed method and apparatus of video |
| CN109803146B (en) * | 2019-04-04 | 2021-05-25 | 网易（杭州）网络有限公司 | Method, apparatus, medium, and device for secondary compression of video |
| CN111026659A (en) * | 2019-12-05 | 2020-04-17 | 南开大学 | Mobile application callback analysis research method based on embedded representation |
| CN111026659B (en) * | 2019-12-05 | 2023-04-21 | 南开大学 | Mobile application callback analysis research method based on embedded representation |
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