什么是Y4M文件格式

 Y4M(YUV4MPEG2)文件格式是一种以头文件存储视频规格的未压缩视频序列。简单来说,在原始的YUV序列的起始和每一帧的头部都加入了纯文字形式的视频参数信息,包括分辨率、帧率、逐行/隔行扫描方式、高宽比,以及每一起始帧标志位。

这个解释来自于: http://www.zhuanhuan123.com/

编译好的x265,带y4m文件 Syntax: x265 [options] infile [-o] outfile infile can be YUV or Y4M outfile is raw HEVC bitstream Executable Options: -h/--help Show this help text and exit -V/--version Show version info and exit Output Options: -o/--output Bitstream output file name --log-level Logging level: none error warning info debug full. Default info --no-progress Disable CLI progress reports --[no-]cu-stats Enable logging stats about distribution of cu across all modes. Default disabled Input Options: --input Raw YUV or Y4M input file name. `-` for stdin --fps Source frame rate (float or num/denom), auto-detected if Y4M --input-res WxH Source picture size [w x h], auto-detected if Y4M -f/--frames Maximum number of frames to encode. Default all --seek First frame to encode Quality reporting metrics: --[no-]ssim Enable reporting SSIM metric scores. Default disabled --[no-]psnr Enable reporting PSNR metric scores. Default disabled Profile, Level, Tier: --profile Enforce an encode profile: main, main10, mainstillpicture --level-idc Force a minumum required decoder level (as '5.0' or '50') --[no-]high-tier If a decoder level is specified, this modifier selects High tier of that level Threading, performance: --threads Number of threads for thread pool (0: detect CPU core count, default) -F/--frame-threads Number of concurrently encoded frames. 0: auto-determined by core count --[no-]wpp Enable Wavefront Parallel Processing. Default enabled --[no-]pmode Parallel mode analysis. Default disabled --[no-]pme Parallel motion estimation. De
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