#351: ffv1 frames are not marked as keyframes in mkv
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Reporter: dericed | Owner:
Type: defect | Status: open
Priority: normal | Component: undetermined
Version: unspecified | Resolution:
Keywords: ffv1 mkv matroska mkvalidator | Blocked By:
Blocking: | Reproduced: 0
Analyzed: 0 |
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Comment (by dericed):
Replying to [comment:5 reimar]:
> > aren't all ffv1 frames keyframes
>
> No, they depend on the arithmetic coding state of previous frames unless
you use -g 1.
> The matroska encoder opens a new cluster at the latest after 5 MB of
data. Since your ffv1 frames are very large it can't do that without
creating some clusters without keyframes.
> This could probably be improved/made configurable in the muxer, but
those are only warnings after all.
Thanks for the explanation of the 5MB limit. For now, I'll looking into
using '-g 1' or 'mkclean --remux' on the result.
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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/351#comment:6>
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