"H.264 / AVC Video Code Technology Detailed" video tutorial has been on "CSDN", which details the background, standard protocol and implementation of H.264, and through a practical engineering form to H.264 Standard analysis and implementation, welcome to watch!
"The paper is very shallow, perceived this matter", only the standard document is operated in the form of code, in order to have a sufficient understanding and understanding of the video compression coding standards!
Link address: H.264 / AVC video codec technology detailed
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Common H.264 video codec (X264 and JM) JM reference software and download the codec
We already know, H.264 is a video compression standard, which only requires a standard format stream, as well as analytical method for each syntax elements of the code stream. H.264 standard does not provide an encoder implementation or processes, which to a great degree of freedom of different vendors or organizations realized in terms of coding, and produced some of the more well-known open source H.264 codec project. H.264 encoder wherein two of the most famous and undoubtedly JM X264, both of which belong to one kind of coding standard H.264 implementation form.
JM: JM H.264 is generally considered the standard-setting team recognized official reference software, basically all the features of the H.264 standard. JM runtime computation process is complex, and does not accelerate the optimization method uses the assembly, thus run slower, difficult to achieve real-time encoding and decoding. Usually mainly used for scientific research codec technology, currently (2016.7) the latest version of JM 19. X264: X264 is another well-known open source H.264 video encoder, developed by the open source organization VideoLan development. X264 is currently the most widely used open source business encoder, largely because JM X264 relative to a lot of optimization and simplification, making it a substantial increase in operating efficiency, mainly to simplify the coding cost calculation method and add MMX, SSE assembler optimization and other parts. Although the quality of the encoded declined slightly in some cases relative to JM, but has been unable to conceal its applicability, especially in terms of real-time encoding an unparalleled advantage.
Here we first of all from JM principle to study the H.264 standard start to start. Download JM source code is: http: //iphome.hhi.de/suehring/tml/download/. As shown below:
In the directory, you can choose the latest version of jm19.0, version history can also be selected from old_jm, as selected jm8.6 version. After downloading codecs, which contains visible lencod, ldecod other projects:
Contains a number suffix .cfg configuration file in the bin directory of the project file folder:
encoder_baseline.cfg: H.264 coding standard for achieving grade profile; encoder_main.cfg: H.264 coding for implementing a main profile level; encoder_extended.cfg: H.264 coding for realizing extended profile configuration file;
The encoder_baseline.cfg copy and rename encoder.cfg, so automatically the encoder profile as the default encoder configuration. Modify the configuration file:
################################################## ########################################
# Files
################################################## ########################################
InputFile = "akiyo_qcif.yuv" # Input sequence, YUV 4: 2: 0
InputHeaderLength = 0 # If the inputfile has a header, state it's length in byte here
StartFrame = 0 # Start frame for encoding. (0-N)
FramesToBeEncoded = 10 # Number of frames to be coded
FrameRate = 30 # Frame Rate per second (1-100)
SourceWidth = 176 # Image width in Pels, must be multiple of 16
SourceHeight = 144 # Image height in Pels, must be multiple of 16
TraceFile = "trace_enc.txt"
ReconFile = "test_rec.yuv"
OutputFile = "test.264"
################################################## ########################################
# Encoder Control
################################################## ########################################
ProfileIDC = 66 # Profile IDC (66 = baseline, 77 = main, 88 = extended)
LevelIDC = 30 # Level IDC (e.g. 20 = level 2.0)
IntraPeriod = 1 # Period of I-Frames (0 = only first)
IDRIntraEnable = 0 # Force IDR Intra (0 = disable 1 = enable)
......
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The YUV coding sequence encoder.cfg file to be generated is placed under the directory lencod.exe performs encoding program, to generate the code stream conforming to the H.264 standard:
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