[FFmpeg-user] Green line with vaapi scaling

[Dennis Mungai]

Can you retest with git head?

Build FFmpeg from source and retest.

At the moment, you're using FFmpeg 3.3.1-1.

On 13 June 2018 at 21:22, André Hänsel <andre at webkr.de> wrote:

> 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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