Opened 3 months ago

Closed 2 months ago

#11151 closed defect (fixed)

The av1 decoding results of ffmpeg+vaapi output and software libdav1 output are inconsistent

Reported by: Zhaoliang Owned by:
Priority: normal Component: undetermined
Version: git-master Keywords:
Cc: Hirokazu Honda Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

with the latest ffmpeg+vaapi decoder, the decoding result of av1 bitstream is not aligned with ffmpeg dav1d decoder.

The test bitstream is in ​https://code.videolan.org/videolan/dav1d-test-data/-/blob/0b1ae65ec0c949bb1aac496d1b3f8bde5ffb10b8/8-bit/issues/48_delayed.ivf. And the first mismatching frame is 121
How to reproduce:

First build ffmpeg with vaapi and libdav1d support.

$ffmpeg -vaapi_device /dev/dri/renderD128 -hwaccel vaapi -i 48_delayed_20201006.ivf -f segment -segment_time 0.01 -frames 557 -pix_fmt yuv420p output_%04d.yuv
$md5sum output_0121.yuv

$ffmpeg -i 48_delayed_20201006.ivf -f segment -segment_time 0.01 -frames 557 -pix_fmt yuv420p output_%04d.yuv
$md5sum output_0121.yuv

ffmpeg version
built on N-116752-g507c2a5774 (c) 2000-2024 the FFmpeg developers

Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.

Change History (4)

comment:1 by Hirokazu Honda, 3 months ago

Cc: Hirokazu Honda added

comment:2 by Fei Wang, 2 months ago

Fixed patch submitted to ​https://patchwork.ffmpeg.org/project/ffmpeg/list/?series=12747. Please have a try.

comment:3 by Zhaoliang, 2 months ago

Hi Fei, thanks for the fix! I have verified this patch and it works well to resolve the issue! :)

comment:4 by Fei Wang, 2 months ago

Resolution: → fixed
Status: new → closed

Patch applied to master, close this ticket. Thanks.

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