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i am trying to convert a raw video into lossless video that is playable by VLC or QuickTime.

The structure of the input video:

  • pixels are 8-bit grayscale

  • frame size is 1280x1024 pixels

  • frames start from offset XXX bytes from the start of the file

  • each subsequent frame starts with an offset YYY bytes (that is, there is a gap of YYY bytes between frames). It is possible that XXX = YYY but I want to know a more general solution, if achievable.

  • number of frames is not known in advance

I start with:

ffmpeg7 -f rawvideo -pixel_format gray -video_size 1280x1024 -r 1 -i aaa.raw -r 120 -vcodec av1 aaa.mp4

However, this does not accommodate the frame offsets and I end up with garbage.

How do I account for the frame offsets within the file?

I would also appreciate suggestions for lossless codecs and containers, other than AV1 and mp4.

Thank you for your time.

as a follow up, what would be a the arguments for ffplay?

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  • Is YYY related to the width or height value? Give some concrete numbers.
    – Gyan
    Commented Jul 4 at 4:25
  • YYY is not related to H or W. In files I am dealing with at the moment it's 512 bytes. It can be any other value. It's just the size of the frame metadata.
    – yesh
    Commented Jul 4 at 17:28
  • I looked up and FFV1 is a good lossless codec for MKV container (I see 4x compression). I can also use "-crf 0" or "-qp 0" when encoding with libx264 or libx265 into MP4 containers. None of those, however, can be played with QuickTime. Just FYI.
    – yesh
    Commented Jul 6 at 21:45
  • I went the programming route and wrote a Python program for the conversion.
    – yesh
    Commented Jul 6 at 21:47

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