#7399: [ffmpeg-qsv][h264_ffmpeg]decode drop frames on iHD driver.
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Reporter: | Owner:
zhuqingliang | Status: new
Type: defect | Component:
Priority: normal | undetermined
Version: unspecified | Resolution:
Keywords: qsv | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by jkqxz):
libmfx doesn't seem to be producing exact output here, though it does look
visually correct? Using VAAPI with iHD does get the expected result, so
it's only a problem with libmfx and not the iHD driver.
I get:
{{{
$ LIBVA_DRIVER_NAME=iHD ./ffmpeg -y -hwaccel qsv -c:v h264_qsv -i reinit-
large_420_8-to-small_420_8.h264 -vf
'hwdownload,format=nv12,format=yuv420p' out_mfx.yuv
...
$ LIBVA_DRIVER_NAME=iHD ./ffmpeg -y -hwaccel vaapi -hwaccel_output_format
vaapi -i reinit-large_420_8-to-small_420_8.h264 -vf
'hwdownload,format=nv12,format=yuv420p' out_va.yuv
...
$ ./ffmpeg -y -i reinit-large_420_8-to-small_420_8.h264 out_ref.yuv
...
$ md5sum out_*.yuv
eee1a8af32fc9ae651356f88da040e7a out_mfx.yuv
151bf4fac480ad53d8f62ed6cd43b55c out_ref.yuv
151bf4fac480ad53d8f62ed6cd43b55c out_va.yuv
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7399#comment:2>
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