JM8.6配置文件中参数的解释

小咪咪 2022-07-12 09:46 150阅读 0赞

参考JVT-Q042文档，可以学到很多东西. 说明: 不同profile的配置文件中参数一样，只是取值不一样而已，本人认为这样并不好，在baseline的配置文件中带有B帧的信息，非常不好，容易误导人，因为baseline根本就不支持B帧. 下面将对配置文件重要的参数进行解释.

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**InputFile**             = "foreman\_part\_qcif.yuv"       \# Input sequence, YUV 4:2:0

*Description*: Input sequence name. Name could include file path. Current software only supports concatenated input sources (i.e. all components and frames should be included in a single file)  .必须是yuv420的形式，如果不是，需要先转.

*Note*: For Unix/[Linux][] based systems directories should be separated using a backslash “\\”, while for DOS\\Windows systems, directories should be separated using a forward slash “/”.  注意Windows和Unix/Linux的不同

**InputHeaderLength**     = 0      \# If the inputfile has a header, state it's length in byte here

*Description*: Specifies inputfile header size in terms of bytes. For RAW data files (i.e. YUV) this is usually 0 (default).

**StartFrame**            = 0      \# Start frame for encoding. (0-N)

*Description*: Specifies initial frame for encoding. Default value is 0.

**FramesToBeEncoded**     = 1      \# Number of frames to be coded

*Description*: Specifies number of frames to be coded excluding B slice coded frames. Default is set to 1. We shall call this as the *primary layer* of the bitstream. If B slices (or Explicit Coding Structure) are to be used (we will call this as the *secondary layer*) then:

FramesToBeEncoded = int((TotalNumberOfFrames-1)/(NumberBFrames +  1)) + 1      本人尝试过，有B帧，还真是不一样.

**FrameRate**             = 30    \# Frame Rate per second (1-100)

*Description*: Input File Frame rate. Supports values in the range \[0.0, 100.0\]. Default value is 30.0.

*Note: *For interlace material (i.e. 60 or 50 fields), value should be set equal to FieldRate/2 (i.e. 30.0 and 25.0 respectively).

**SourceWidth**           = 176    \# Image width in Pels, must be multiple of 16

*Description*: Image width in Luminance Samples. If the value is not a multiple of 16 the image is automatically cropped to the next number that is a multiple of 16. Default is 176.  不是16的倍数，则需扩展

**SourceHeight**          = 144    \# Image height in Pels, must be multiple of 16

*Description*: Image height in Luminance Samples. If no Interlace tools are used and if the value is not a multiple of 16 the image is automatically cropped to the next number that is a multiple of 16. Otherwise if the value is not a multiple of 32 the image is automatically cropped to the next number that is a multiple of 32. Default is 144.  竖直方向高度，赢考虑扩展，还要考虑帧或场.

**TraceFile**             = "trace\_enc.txt"

*Description*: Bitstream Tracefile. File is useful for debugging. To enable, code needs to be compiled by setting the define TRACE in defines.h to 1.

TraceFile在分析码流时很有用，要学会利用

*Warning!!!*

*Enabling this option may result in the generation of very large files, while would also slow down encoding considerably. Enable with caution. Parameter recommended for debugging purposes.*

**ReconFile**             = "test\_rec.yuv"

*Description*: Output reconstructed name. Name could include file path. If empty, no output is generated.

**OutputFile**            = "test.264"

*Description*: Output bitstream name. Name could include file path.

至于其他参数的含义，可以参考JVT-Q042文档, 这个文档非常非常详细，在此不再赘述.

[Linux]: http://lib.csdn.net/base/linux