When trying to convert an MKV file with PGS subtitles to ProRes 422 HQ using DCP-o-matic's export video function, I consistently see artifacts at the right side of those (then burned-in) subtitles. They appear as green and/or purple pixels like this:
The source of the MKV file is a blu-ray (but I don't think this matters, and it appears using all MKVs containing PGS subtitles):
I just load the MKV in DCP-o-matic, choose the container format 1.78 (for which you have to select the non-default container formats in settings), select 'use as open subtitles' in timed text tab and then export video to MOV / ProRes HQ. I'm using 2.18.24 on a Apple M1 Mac.
I know this is a bit beyond the intended scope of DCP-o-matic (which we happily use to render DCPs and never had such issues with PGS subtitles, but I know JPEG2000 rendering is something entirely different), but before I delve into more details and options, do you think this is an FFmpeg/Lavf issue or a DCP-o-matic bug?
Artifacts in exported ProRes
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marcel
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- Joined: Thu Nov 06, 2025 8:31 pm
Artifacts in exported ProRes
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