#9377: QSV MPEG2 => H264 transcode PSNR dropped by 32%
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Reporter: eero-t | Type: defect
Status: new | Priority: normal
Component: | Version: git-
undetermined | master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Between following FFmpeg commits:
* 2021-06-19 2cf95f2dd9: lavfi/dnn_backend_openvino.c: fix crash when
target is not specified
* 2021-06-20 efc22e63e5: lavfi/vf_vpp_qsv: fix the time_base for outlink
PSNR for following transcode operation:
{{{
$ ffmpeg -hwaccel qsv -qsv_device /dev/dri/renderD128 -c:v mpeg2_qsv -i
1920x1080i_29.97_20mb_mpeg2_high.mpv -c:v h264_qsv -b:v 6000K
-compression_level 7 -an -vframes 2400 -y 0024_HD17i7_1.0.h264
}}}
Has dropped by 32%, as measured by:
{{{
$ ffmpeg -i 1920x1080i_29.97_20mb_mpeg2_high.mpv -i 0024_HD17i7_1.0.h264
-an -vframes 1199 -filter_complex psnr -f null -
}}}
(I'm using fewer frames in PSNR check than for transcode, because there
were odd results if all frames are used for PSNR calcuation.)
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9377>
FFmpeg <https://ffmpeg.org>
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