#11250: VVC MP4 Decoding Issue - Frames Are Missing
-------------------------------------+-------------------------------------
Reporter: | Type: defect
Rupert_Williamson |
Status: new | Priority: important
Component: ffmpeg | Version:
Keywords: vvc, vvenc, | unspecified
livbbenc, mp4 | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug:
Attempting to extract frames from a vvenc-encoded .mp4 file does not
extract all the frames.
How to reproduce:
{{{
Encode with:
% ffmpeg -r 60 -ss 0 -i silver.mov -t 4 -y -c:v libvvenc vvc.mp4
Then decode with:
ffmpeg -r 60 -i vvc.mp4 out/out_%04d.png
ffmpeg version 2024-10-10-git-0f5592cfc7-full_build-www.gyan.dev Copyright
(c) 2000-2024 the FFmpeg developers
}}}
Rather than getting 240 frames as I would expect (4 seconds of 60.000 fps
input), I only get 209 frames out.
In this case the input file is a lossless 8bpc RGB 60fps 4K uncompressed
.mov file. However I have this issue with other files too, such as 16 bit
.nut files or even 16bpc .tif sequences.
Gyan thinks it "notionally appears to be a bug in the mp4 muxer" and sees
an "editlist setting the start of the video track output from ~half-
second."
For more details, you can see a post I made here:
https://www.reddit.com/r/ffmpeg/comments/1g684mo/vvc_decoding_issue_frames_are_missing/
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11250>
FFmpeg <https://ffmpeg.org>
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