#10598: vaapi_hevc outputs extremely low quality if global quality option set
-------------------------------------+-------------------------------------
Reporter: Ace | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
If the `-q` option is set at all when encoding with hevc_vaapi, the
resulting stream output will be very low - regardless of the quality
factor set. Additionally, when running without the `-q` option, a warning
is presented:
`[hevc_vaapi @ 0x555f0574f640] No quality level set; using default (25).`
however the video quality is substantially higher.
Command used for capture:
{{{
ffmpeg \
-f x11grab -thread_queue_size 1024 -probesize 64M -framerate 60
-video_size ${w}x${h} -i $DISPLAY+$x,$y \
-thread_queue_size 1024 -f pulse -i $audio_source \
-t 00:01:00 \
-vaapi_device /dev/dri/renderD128 \
-vf 'format=nv12,hwupload' \
-c:v hevc_vaapi -maxrate 120M -q 25 -compression_level 2 \
-c:a flac \
~/test.mp4
}}}
FFmpeg version info:
{{{
$ ffmpeg -version
ffmpeg version 6.0 Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 13 (GCC)
configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg
--docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg
--libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2
-flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe
-Wall -Werror=format-security -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3
-Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
-fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1
-m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection
-fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer'
--extra-ldflags='-Wl,-z,relro -Wl,--as-needed -Wl,-z,now
-specs=/usr/lib/rpm/redhat/redhat-hardened-ld -specs=/usr/lib/rpm/redhat
/redhat-annobin-cc1 -Wl,--build-id=sha1 ' --extra-cflags='
-I/usr/include/rav1e' --enable-libopencore-amrnb --enable-libopencore-
amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --enable-
chromaprint --disable-crystalhd --enable-fontconfig --enable-frei0r
--enable-gcrypt --enable-gnutls --enable-ladspa --enable-libaom --enable-
libdav1d --enable-libass --enable-libbluray --enable-libbs2b --enable-
libcdio --enable-libdrm --enable-libjack --enable-libjxl --enable-
libfreetype --enable-libfribidi --enable-libgsm --enable-libilbc --enable-
libmp3lame --enable-libmysofa --enable-nvenc --enable-openal --enable-
opencl --enable-opengl --enable-libopenh264 --enable-libopenjpeg --enable-
libopenmpt --enable-libopus --enable-libpulse --enable-libplacebo
--enable-librsvg --enable-librav1e --enable-librubberband --enable-
libsmbclient --enable-version3 --enable-libsnappy --enable-libsoxr
--enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1
--enable-libtesseract --enable-libtheora --enable-libtwolame --enable-
libvorbis --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-
version3 --enable-vapoursynth --enable-libvpx --enable-vulkan --enable-
libshaderc --enable-libwebp --enable-libx264 --enable-libx265 --enable-
libxvid --enable-libxml2 --enable-libzimg --enable-libzmq --enable-libzvbi
--enable-lv2 --enable-avfilter --enable-libmodplug --enable-postproc
--enable-pthreads --disable-static --enable-shared --enable-gpl --disable-
debug --disable-stripping --shlibdir=/usr/lib64 --enable-lto --enable-
libvpl --enable-runtime-cpudetect
libavutil 58. 2.100 / 58. 2.100
libavcodec 60. 3.100 / 60. 3.100
libavformat 60. 3.100 / 60. 3.100
libavdevice 60. 1.100 / 60. 1.100
libavfilter 9. 3.100 / 9. 3.100
libswscale 7. 1.100 / 7. 1.100
libswresample 4. 10.100 / 4. 10.100
libpostproc 57. 1.100 / 57. 1.100
}}}
Running on Fedora Linux 38, and the GPU is an Radeon RX 6900XT
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10598>
FFmpeg <https://ffmpeg.org>
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