#4653: jpeg2000: -M 1 mode is not lossless (compared to openjpeg)
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Reporter: ami_stuff | Owner:
Type: defect | Status: open
Priority: normal | Component: avcodec
Version: git-master | Resolution:
Keywords: j2k | Blocked By:
Blocking: | Reproduced by developer: 1
Analyzed by developer: 0 |
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Comment (by boxerab):
I have been looking into this very problem on the OpenJPEG side of things.
This is a bug in OpenJPEG - lossless encoding with M==1 (i.e. BYPASS mode)
or M ==4 (RESTART mode) gives a lossy image.
This has been broken for years and years.
I have opened an issue on OpenJPEG github tracker:
https://github.com/uclouvain/openjpeg/issues/674
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Ticket URL: <https://trac.ffmpeg.org/ticket/4653#comment:6>
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