I write a bitstream filter for ffmpeg. It can modify sps in H264 bitstream. So far it can change sar, fps, crop information, level, ref frames, cfr/vfr flag, fullrange flag, colorprim, transfer and colormatrix. Since the length of bitstream may be changed, I cannot make an in-place modifier. ffmpeg git 29946 Download from sf (win32 only) Patches can be found on svn. Note this is a demuxer/muxer on
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