I've compiled the most recent snapshot of ffmpeg with vaapi enabled
$ ffmpeg -hwaccesls
ffmpeg version N-98129-g0b182ff Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
configuration: --disable-debug --disable-doc --disable-ffplay --enable-shared --enable-avresample --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-gpl --enable-libass --enable-fontconfig --enable-libfreetype --enable-libvidstab --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxvid --enable-libx264 --enable-nonfree --enable-openssl --enable-libfdk_aac --enable-postproc --enable-small --enable-version3 --enable-libzmq --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-libopenjpeg --enable-libkvazaar --enable-libaom --extra-libs=-lpthread --enable-libsrt --enable-vaapi --extra-cflags=-I/opt/ffmpeg/include --extra-ldflags=-L/opt/ffmpeg/lib
libavutil 56. 54.100 / 56. 54.100
libavcodec 58. 92.100 / 58. 92.100
libavformat 58. 46.101 / 58. 46.101
libavdevice 58. 11.100 / 58. 11.100
libavfilter 7. 86.100 / 7. 86.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100
Hardware acceleration methods:
vaapi
I know that vaapi is working because I can use it for hardware decoding and encoding of h264 videos. I can see some vaapi filters as well
$ ffmpeg -filters | grep vaapi
... deinterlace_vaapi V->V (null)
... denoise_vaapi V->V (null)
... procamp_vaapi V->V (null)
... scale_vaapi V->V (null)
... sharpness_vaapi V->V (null)
However, I notice that this list is missing the filter that I'm specifically looking for, namely , transpose_vaapi. If you look in the libavfilter source code you'll see the following
This shows the transpose_vaapi filter defined in the allfilters.c file
https://github.com/FFmpeg/FFmpeg/blob/master/libavfilter/allfilters.c#L414
This shows the transpose_vaapi filter source code
https://github.com/FFmpeg/FFmpeg/blob/master/libavfilter/vf_transpose_vaapi.c
If the filter is defined in source code, it's defined in allfilters.c, and I've compiled ffmpeg from this source with vaapi enabled, why can I not use this filter with ffmpeg?
$ ffmpeg -y -hide_banner -nostats -loglevel error \
-hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi \
-i ./test_video.mp4 \
-vf 'format=nv12,transpose_vaapi=2' \
-c:v h264_vaapi \
/tmp/rotated_video.mp4
[AVFilterGraph @ 0xf14000] No such filter: 'transpose_vaapi'
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
EDIT -
Looking through the source code for vf_transpose_vaapi.c I see the following logic
if (!pipeline_caps.rotation_flags) {
av_log(avctx, AV_LOG_ERROR, "VAAPI driver doesn't support transpose\n");
return AVERROR(EINVAL);
}
that's inside of the transpose_vaapi_build_filter_params function which is part of the filter initialization process. I guess it's possible that, if that call failed, the filter would fail to be built and it would not be registered as a valid filter? This seems like something that would happen at runtime when I attempt to run the filter rather than something that would happen at compile time when setting which filters are defined.
