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Choppy playback of interlaced content with QSV accelerated transcoding #427
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@xarblu Do you have a sample clip that can reproduce the problem? |
test_interlaced.mp4This clip reliably reproduces the issue for me. If you want I can also provide a screen recording to show what it looks like. |
This seems to be an issue in ffmpeg6, can you upgrade to jellyfin 10.9.9 and try out the ffmpeg7 we are working on? |
FFmpeg7 seems to fix this issue, thanks! Should this be closed then or does it depend on the ffmpeg7 PR? |
You can keep this open until jellyfin-ffmpeg7 is released. |
Not directly the issue, but in July Intel devs finally enabled advanced hw-deinterlace(ADI) in iHD (intel-media-driver). It had forever been enabled in the i965 intel-vaapi-driver and the quality was excellent. Now the iHD is no more limited to BOB, but can also do Motion Adaptive (MADI) and Motion Compensated (MCDI) in hardware. |
This is a limitation caused by the mis-alignment between iHD driver and VA-API interface definition, not sure why they delayed it for so long. We just need to update iHD and VPL runtime to 24.3.1+ in our next release. As for the zero-copy pipeline, we have supported it for years. |
This issue respects the following points:
Description of the bug
When QSV is chosen as hardware acceleration (de- & encoder) the produced video stream is "choppy" (looks like low fps)
Reproduction steps
What is the current bug behavior?
The video playback stutters/has low fps.
What is the expected correct behavior?
Should play back smooth.
Jellyfin Server version
10.9.8+
Specify commit id
No response
Specify unstable release number
No response
Specify version number
No response
Specify the build version
10.9.8
Environment
Jellyfin logs
FFmpeg logs
Client / Browser logs
No response
Relevant screenshots or videos
No response
Additional information
For testing I copied the FFmpeg command and had it write to a .mkv, then findings being:
deinterlace_qsv=mode=2
: output with double fps, progressive frames, stutteringdeinterlace_qsv
: output of same fps, also progressive frames, no stutteringI'm no expert on the QSV stack but could it be possible that
deinterlace_qsv=mode=2
isn't necessary here and deinterlacing is already covered bycodec_qsv
decoding?The text was updated successfully, but these errors were encountered: