#7404: [ffmpeg-qsv][vc1_decode]some frames error in dump file on iHD driver.
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Reporter: | Owner:
zhuqingliang | Status: new
Type: defect | Component:
Priority: normal | undetermined
Version: unspecified | Resolution:
Keywords: qsv vc1 | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by jkqxz):
The libmfx decoder seems to have lost some of the output?
Decoding with VAAPI on the iHD driver agrees with software output:
{{{
$ LIBVA_DRIVER_NAME=iHD ./ffmpeg -y -vsync 0 -hwaccel qsv -c:v vc1_qsv -i
SA00049.vc1 -vf 'hwdownload,format=nv12,format=yuv420p' out_mfx.yuv
...
$ LIBVA_DRIVER_NAME=iHD ./ffmpeg -y -vsync 0 -hwaccel vaapi
-hwaccel_output_format vaapi -i SA00049.vc1 -vf
'hwdownload,format=nv12,format=yuv420p' out_va.yuv
...
$ ./ffmpeg -y -vsync 0 -i SA00049.vc1 -vf 'format=yuv420p' out_ref.yuv
...
$ md5sum out_*.yuv
41092ad3043fa245cd6f7edab7252a67 out_mfx.yuv
aed9984f8a6e57cc563390a3e188f600 out_ref.yuv
aed9984f8a6e57cc563390a3e188f600 out_va.yuv
$ du -b out_*.yuv
3225600 out_mfx.yuv
3456000 out_ref.yuv
3456000 out_va.yuv
}}}
(That file does not have complete timestamps, hence -vsync 0.)
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7404#comment:2>
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