Converting an existing clean 8k Quicktime Prores 444 file in FFmpeg yields banding. It's a lenflare with a completely smooth gradient from center out to edge of frame (no alpha). If I use AE2020 to convert it to Prores 444, the new file is clean without banding. Am I doing something wrong? Here is the command string:

ffmpeg.exe -i file_8k.mov -map_metadata -1 -c:v prores_ks -profile:v 4 -pix_fmt yuv444p10le -color_primaries 1 -color_trc 1 -colorspace 1 -color_range 2 -y file_6k.mov

In this case I'm converting it down to 6k, however other resolutions show the same problem, plus even converting to the same res.

  • Sorry didn't include my rescale code: -filter:v "scale=5760:-1" however I'm presuming this has nothing to do with the problem.
    – brian dm
    Jan 29 at 6:53
  • Share full log.
    – Gyan
    Jan 29 at 11:46
  • @Gyan let me know if this qualifies as a log: finalight.com/maindir/webpages/ffmpeg_batch.txt
    – brian dm
    Jan 30 at 23:09
  • Have you tried -c:v prores rather than prores_ks I know there were some bugs with banding a while ago with prores_ks.
    – stib
    Feb 3 at 0:07

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