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I just want to crop 2 pixels (Top) to get identical black bars (now is 138 TOP and 140 BOTTOM) but without re-encoding. I think it is possible with FFmpeg but I'm not sure. I want to do this with one H264 video (m2ts from blu-ray).

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  • This is impossible without re-encoding. Chillax. No-one will die if you re-encode your video.
    – stib
    Commented Jul 21, 2021 at 2:01

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You can use the h264_metadata bitstream filter.

ffmpeg -i in -c copy -bsf:v h264_metadata=crop_top=140 out

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