CN102724551A - Video encoding system and video encoding method - Google Patents
Video encoding system and video encoding method Download PDFInfo
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- CN102724551A CN102724551A CN2012101940941A CN201210194094A CN102724551A CN 102724551 A CN102724551 A CN 102724551A CN 2012101940941 A CN2012101940941 A CN 2012101940941A CN 201210194094 A CN201210194094 A CN 201210194094A CN 102724551 A CN102724551 A CN 102724551A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/233—Processing of audio elementary streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
- H04N21/2368—Multiplexing of audio and video streams
Abstract
The invention discloses a video encoding system and a video encoding method. The video encoding method includes: an audio and video acquisition device acquires audio streams and video streams of an audio and video signal source and transmits the audio streams and video streams to a decoder; the decoder invokes a corresponding decoding module for decoding and processing according to formats of the audio streams and video streams to acquire original audio stream and video stream data, replicates the data in a preset quantity and transmits the data to a multichannel encoding device; the multichannel encoding device encodes according to preset encoding formats and encoding rate to generate corresponding audio and video synchronous information and transmits the synchronous information to a multichannel encoding packaging device; and the multichannel encoding packaging device packages the encoded audio streams and video streams into audio and video streams of preset packaging formats and transmits the audio and video streams to a video file storage device which stores the audio and video streams to audio and video files. By the video encoding system and the video encoding method, multichannel video output format encoding for the same video source can be effectively achieved, the requirements of users on encoding timeliness and the requirements on encoding equipment cost are met, and smooth rate switching of live broadcasting via internet can be achieved.
Description
Technical field
The present invention relates to technical field of video coding, relate in particular to a kind of video coding system and method.
Background technology
In history, vision signal is stored on the tape with analog form.Along with the continuous development of technology, audio signal is stored with digital form, and vision signal is also brought into use digitized format, and some correlation techniques also begin to grow up thereupon, needs a kind of coded system to come Voice & Video is compressed and transmits.So-called video coding mode just is meant and the file conversion of certain video format is become the mode of another kind of video format file through specific compress technique.H.264 of paramount importance encoding and decoding standard has International Telecommunication Association in the video flowing transmission at present; The M-JPEG of motion rest image expert group and the MPEG series standard of Motion Picture Experts Group of International Standards Organization, RealVideo, the WMV of Microsoft and the QuickTime of Apple company etc. that also have Real-Networks that are widely used on the internet in addition.
MPEG is the abbreviation of Motion Picture Experts Group (Moving Picture Experts Group); Set up in 1988; Be the expert group that formulates compression standard for digital video/audio, had more than 300 member at present, comprise world-famous companies such as IBM, SUN, BBC, NEC, INTEL, AT&T.It is to formulate the various standards that are used for " live image " coding that MPEG organizes the mandate that obtains at first, is extended for " and audio frequency of following " and assembly coding thereof subsequently.To different application requirements, remove the restriction of " being used for digital storage media " afterwards, and become the tissue of present formulation " live image and audio coding " standard.Each standard that MPEG organizes to set up all has different targets and application, has proposed MPEG-1, MPEG-2, MPEG-4, MPEG-7 and MPEG-21 standard at present.Video Codec is meant the program or the equipment that can compress or decompress digital video.Common this compression belongs to and diminishes data compression.Existing Video Coder Implementation principle is: audio-video signal source, decoder, encoder, coding wrapper connect successively.Preserve packaged audio, video data get off with the mode of file at last, so that transmission later on or shared used.
But existing coded system generally can only be exported one tunnel audio, video data through coding to one tunnel signal source; The audio frequency and video of same if desired video source output various code rate form generally need be carried out repeatedly identical encoding operation; Three kinds if desired, so just need repeat three same operations.If from the beginning the format change of little or nothing also must once encode again, for example just change resolution or code check of video etc.
If input source is the TV broadcasting signal; If want to export the audio, video data of a plurality of forms so, need to transcribe original broadcasting signal get off earlier, and then repeatedly encode; The audio frequency and video form that generation needs; Perhaps need a plurality of encoders simultaneously input signal source to be encoded simultaneously, the video of three kinds of forms so just needs three identical encoders if desired.For first kind of mode, ageing if the user need encode, so just can not satisfy the demand, for the second way,, increased encoding device though satisfied ageing requirement, improved cost.
If the user hopes at the internet viewing live video stream; And hope can be play the audio-video document of different code checks according to the Link State of the Internet; Must produce the audio/video flow of various code rate so simultaneously; And can be at low code check to level and smooth switching between the high code check, existing encoder can't realize this user's request.
Summary of the invention
The system and method that the purpose of this invention is to provide a kind of video coding; Can carry out the coding of multi-channel video output format to same video source simultaneously; Promptly both solve user's ageing to coding requirement, and can only use an equipment just can satisfy the requirement of output various code rate again, also solved the cost problem of encoding device; Owing to be the multichannel output simultaneously of a device coding, can realize that the live code check in level and smooth the Internet switches simultaneously.
One side of the present invention; A kind of video coding system is provided; Comprise audio and video acquisition devices, decoder, multiplex coding device, multiplex coding packaging system and video file storage device, said audio and video acquisition devices, decoder, multiplex coding device, multiplex coding packaging system and video file storage device are connected successively; Wherein
Said audio and video acquisition devices is used to gather the audio stream and the video flowing in audio-video signal source and be sent to decoder;
Said decoder is used for audio stream and decoding video stream that audio and video acquisition devices is sent to, obtains raw audio streams and video flowing, duplicates predetermined number to decoded raw audio streams and video stream data then and is sent to the multiplex coding device and encodes;
Said multiplex coding device is used for raw audio streams and the video flowing received are encoded respectively, generates the different audio streams with code check of form and the video flowing of predetermined number, and the audio stream after will encoding and video flowing are sent to the multiplex coding packaging system;
Said multiplex coding packaging system is used to receive audio stream and the video flowing behind the said coding that the multiplex coding device sends, and is encapsulated as the audio/video flow of different-format;
Said video file storage device is used to receive the audio/video flow after the encapsulation, and saves as audio-video document.
Further, said multiplex coding device comprises the coded format and the encoder bit rate different coding device of predetermined number.
Further, said multiplex coding packaging system comprises and the encoder coding wrapper of predetermined number one to one.
The present invention provides a kind of method for video coding on the other hand, it is characterized in that, may further comprise the steps:
Steps A, audio and video acquisition devices are selected different input interfaces according to different audio-video signal sources, audio frequency acquiring stream and video flowing, and be sent to decoder;
Step B, decoder receive said audio stream and the video flowing that audio and video acquisition devices is sent; Form according to said audio stream and video flowing; Call corresponding decoder module respectively and decode, audio frame and the frame of video that damage is arranged abandoned or mend loyal the processing, and guarantee the synchronous of audio frame and frame of video; Obtain raw audio streams and video stream data, the said raw audio streams and the video stream data that duplicate predetermined number are sent to the multiplex coding device;
Each encoder in step C, the multiplex coding device receives a said raw audio streams and video stream data; Each encoder is encoded according to its preset coded format and encoder bit rate; Generate corresponding audio-visual synchronization information, and the audio stream after will encoding, video flowing and audio-visual synchronization information are sent to the correspondence coding wrapper in the multiplex coding packaging system;
The coding wrapper is packaged into the audio/video flow of presetting encapsulation format according to the audio stream and the video flowing of said audio-visual synchronization information after said coding in step D, the multiplex coding packaging system, is sent to the video file storage device;
Step e, video file storage device receive the audio/video flow after the encapsulation and save as audio-video document.
Further, in the steps A, said audio-video signal source comprises that the SDI of video camera video recording, TV station broadcasts information, cable TV signal and satellite-signal.
Technique effect of the present invention is:
A kind of system and method for video coding can be provided for technical field of video coding; Can carry out the coding of multi-channel video output format to same video source simultaneously; Solved user's ageing to coding requirement; Reduced the cost of encoding device, realized that the live code check in level and smooth the Internet switches.
Other features and advantages of the present invention will be set forth in specification subsequently, and, partly from specification, become obvious, perhaps understand through embodiment of the present invention.The object of the invention can be realized through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structural representation of video coding system among the present invention.
Fig. 2 is the flow chart of method for video coding among the present invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.
Fig. 1 is the structural representation of video coding system in the specific embodiment of the invention.As shown in Figure 1, video coding system mainly comprises following device:
Audio and video acquisition devices 101, decoder 102, multiplex coding device 103, multiplex coding packaging system 104 and video file storage device 105.The multiplex coding device further comprises the coded format and the encoder bit rate different coding device of predetermined number.The multiplex coding packaging system further comprises and the encoder coding wrapper of predetermined number one to one.
Said audio and video acquisition devices, decoder, multiplex coding device, multiplex coding packaging system and video file storage device are connected successively.Wherein
Said audio and video acquisition devices is used to gather the audio stream and the video flowing in audio-video signal source and be sent to decoder.
Said decoder is used for audio stream and decoding video stream that audio and video acquisition devices is sent to, obtains raw audio streams and video flowing, duplicates predetermined number to decoded raw audio streams and video stream data then and is sent to the multiplex coding device and encodes.
Said multiplex coding device is used for raw audio streams and the video flowing received are encoded respectively, generates the different audio streams with code check of form and the video flowing of predetermined number, and the audio stream after will encoding and video flowing are sent to the multiplex coding packaging system.
Said multiplex coding packaging system is used to receive audio stream and the video flowing behind the said coding that the multiplex coding device sends, and is encapsulated as the audio/video flow of different-format.
Said video file storage device is used to receive the audio/video flow after the encapsulation, and saves as audio-video document.
Fig. 2 is the flow chart of method for video coding in the specific embodiment of the invention.As shown in Figure 1, the flow process of method for video coding specifically may further comprise the steps:
After step 201, audio and video acquisition devices receive cable TV signal, select the cable TV signal interface, audio frequency acquiring stream and video flowing, and be sent to decoder;
Each encoder in step 203, the multiplex coding device receives a said RAW format audio stream and video stream data, and encoder 1 preset video code model is RV40, and preset video frequency coding rate is 700kbps; Preset audio coding form is AAC, and preset audio coding code check is 192kbps, and encoder 2 preset video code models are XviD; Preset video frequency coding rate is 1600kbps; Preset audio coding form is AAC, and preset audio coding code check is 96kbps, and encoder 3 preset video code models are for H.264; Preset video frequency coding rate is 3500kbps; Preset audio coding form is AAC, and preset audio coding code check is 192kbps, and each encoder is encoded according to its preset coded format and encoder bit rate; Generate corresponding audio-visual synchronization information, and the audio stream after will encoding, video flowing and audio-visual synchronization information are sent to the correspondence coding wrapper in the multiplex coding packaging system;
Coding wrapper 1 preset encapsulation format is RMVB in step 204, the multiplex coding packaging system; Coding wrapper 2 preset encapsulation format are AVI; Coding wrapper 3 preset encapsulation format are MOV; Be encapsulated as the audio/video flow of presetting encapsulation format to audio stream after encoding and video flowing according to said audio-visual synchronization information, be sent to the video file storage device;
What should explain at last is: the above is merely the preferred embodiments of the present invention; Be not limited to the present invention; Although the present invention has been carried out detailed explanation with reference to previous embodiment; For a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. video coding system; It is characterized in that; Comprise audio and video acquisition devices, decoder, multiplex coding device, multiplex coding packaging system and video file storage device, said audio and video acquisition devices, decoder, multiplex coding device, multiplex coding packaging system and video file storage device are connected successively; Wherein
Said audio and video acquisition devices is used to gather the audio stream and the video flowing in audio-video signal source and be sent to decoder;
Said decoder is used for audio stream and decoding video stream that audio and video acquisition devices is sent to, obtains raw audio streams and video flowing, duplicates predetermined number to decoded raw audio streams and video stream data then and is sent to the multiplex coding device and encodes;
Said multiplex coding device is used for raw audio streams and the video flowing received are encoded respectively, generates the different audio streams with code check of form and the video flowing of predetermined number, and the audio stream after will encoding and video flowing are sent to the multiplex coding packaging system;
Said multiplex coding packaging system is used to receive audio stream and the video flowing behind the said coding that the multiplex coding device sends, and is encapsulated as the audio/video flow of different-format;
Said video file storage device is used to receive the audio/video flow after the encapsulation, and saves as audio-video document.
2. a kind of video coding apparatus according to claim 1 is characterized in that, said multiplex coding device further comprises the coded format and the encoder bit rate different coding device of predetermined number.
3. a kind of video coding apparatus according to claim 1 is characterized in that, said multiplex coding packaging system further comprises and the encoder coding wrapper of predetermined number one to one.
4. a method for video coding is characterized in that, may further comprise the steps:
A, audio and video acquisition devices are selected different input interfaces according to different audio-video signal sources, audio frequency acquiring stream and video flowing, and be sent to decoder;
B, decoder receive said audio stream and the video flowing that audio and video acquisition devices is sent; Form according to said audio stream and video flowing; Call corresponding decoder module respectively and decode, audio frame and the frame of video that damage is arranged abandoned or mend loyal the processing, and guarantee the synchronous of audio frame and frame of video; Obtain raw audio streams and video stream data, the said raw audio streams and the video stream data that duplicate predetermined number are sent to the multiplex coding device;
Each encoder in C, the multiplex coding device receives a said raw audio streams and video stream data; Each encoder is encoded according to its preset coded format and encoder bit rate; Generate corresponding audio-visual synchronization information, and the audio stream after will encoding, video flowing and audio-visual synchronization information are sent to the correspondence coding wrapper in the multiplex coding packaging system;
The coding wrapper is packaged into the audio/video flow of presetting encapsulation format according to the audio stream and the video flowing of said audio-visual synchronization information after said coding in D, the multiplex coding packaging system, is sent to the video file storage device;
E, video file storage device receive the audio/video flow after the encapsulation and save as audio-video document.
5. according to said a kind of video coding system of claim 4 and method, it is characterized in that in the steps A, said audio-video signal source comprises that the SDI of video camera video recording, TV station broadcasts information, cable TV signal and satellite-signal.
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| CN2012101940941A CN102724551A (en) | 2012-06-13 | 2012-06-13 | Video encoding system and video encoding method |
| PCT/CN2013/075351 WO2013185515A1 (en) | 2012-06-13 | 2013-05-08 | Video coding system and method |
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| CN108495141A (en) * | 2018-03-05 | 2018-09-04 | 网宿科技股份有限公司 | A kind of synthetic method and system of audio and video |
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| CN109150917B (en) * | 2018-10-30 | 2021-06-08 | 广州海格通信集团股份有限公司 | Video synthesis control method and system based on SIP (Session initiation protocol) |
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| CN112040239A (en) * | 2020-09-14 | 2020-12-04 | 国网重庆市电力公司电力科学研究院 | File repair method and device based on AVI format file structure |
| CN112040239B (en) * | 2020-09-14 | 2022-07-26 | 国网重庆市电力公司电力科学研究院 | File repair method and device based on AVI format file structure |
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