When I scale with scale_vaapi, it results in a green line at the bottom of the image, see attachment.
Command line: ffmpeg -hwaccel vaapi -vaapi_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i bbb.mp4 -vf "scale_vaapi=w=240:h=135:format=yuv420p,hwdownload,format=yuv420p" -frames 1 out.png It probably matters that I'm scaling to a height that is not divisible by 2 or 16. The input video here is Big Buck Bunny 1080p. Extra question: Why do I need the second "format=yuv420p" after the hwdownload filter? If I omit it, FFmpeg just gets stuck. For completeness, the console output of above conversion: # ffmpeg -hwaccel vaapi -vaapi_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i bbb.mp4 -vf "scale_vaapi=w=240:h=135:format=yuv420p,hwdownload,format=yuv420p" -frames 1 out.png ffmpeg version 3.3.1-1~16.04.york0 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609 configuration: --prefix=/usr --extra-version='1~16.04.york0' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared libavutil 55. 58.100 / 55. 58.100 libavcodec 57. 89.100 / 57. 89.100 libavformat 57. 71.100 / 57. 71.100 libavdevice 57. 6.100 / 57. 6.100 libavfilter 6. 82.100 / 6. 82.100 libavresample 3. 5. 0 / 3. 5. 0 libswscale 4. 6.100 / 4. 6.100 libswresample 2. 7.100 / 2. 7.100 libpostproc 54. 5.100 / 54. 5.100 libva info: VA-API version 0.39.4 libva info: va_getDriverName() returns 0 libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so libva info: Found init function __vaDriverInit_0_39 libva info: va_openDriver() returns 0 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bbb.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.16.100 Duration: 00:00:09.25, start: 0.000000, bitrate: 11411 kb/s Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 11408 kb/s, 24 fps, 24 tbr, 19200 tbn, 38400 tbc (default) Metadata: rotate : 0 handler_name : VideoHandler Side data: displaymatrix: rotation of -0.00 degrees Stream mapping: Stream #0:0 -> #0:0 (h264 (native) -> png (native)) Press [q] to stop, [?] for help Output #0, image2, to 'out.png': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf57.71.100 Stream #0:0(und): Video: png, rgb24, 240x135, q=2-31, 200 kb/s, 24 fps, 24 tbn, 24 tbc (default) Metadata: encoder : Lavc57.89.100 png handler_name : VideoHandler Side data: displaymatrix: rotation of -0.00 degrees frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=0.883x video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
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