[FFmpeg-trac] #8174(avcodec:new): External wrapper decoder doesn't perform a capability check on YUV subsampling

[FFmpeg]

#8174: External wrapper decoder doesn't perform a capability check on YUV
subsampling
---------------------------------+--------------------------------------
             Reporter:  HolyWu   |                     Type:  defect
               Status:  new      |                 Priority:  normal
            Component:  avcodec  |                  Version:  git-master
             Keywords:           |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
---------------------------------+--------------------------------------
 Summary of the bug:
 When using external wrapper decoder such as hevc_cuvid on a video stream
 whose YUV subsampling is not supported by the device, for example my GTX
 1060 doesn't support HEVC 4:4:4 hardware decoding, FFmpeg CLI keeps
 printing error messages endlessly before I press [q] to stop.

 How to reproduce:
 {{{
 % ffmpeg -c:v hevc_cuvid -i test.265 -f null -
 ffmpeg version N-94953-gef50cf7b32 Copyright (c) 2000-2019 the FFmpeg
 developers
   built with gcc 9.1.1 (GCC) 20190807
   configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-
 fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-
 libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame
 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
 --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr
 --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack
 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2
 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-
 libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa
 --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx
 --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc
 --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
 --enable-amf
   libavutil      56. 35.100 / 56. 35.100
   libavcodec     58. 57.100 / 58. 57.100
   libavformat    58. 32.104 / 58. 32.104
   libavdevice    58.  9.100 / 58.  9.100
   libavfilter     7. 58.102 /  7. 58.102
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
   libpostproc    55.  6.100 / 55.  6.100
 Input #0, hevc, from 'test.265':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: hevc (Rext), yuv444p(tv), 1920x1080, 25 fps, 25
 tbr, 1200k tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (hevc (hevc_cuvid) -> wrapped_avframe (native))
 Press [q] to stop, [?] for help
 [hevc_cuvid @ 000002a1631dc380]
 ctx->cvdl->cuvidCreateDecoder(&ctx->cudecoder, &cuinfo) failed ->
 CUDA_ERROR_NO_DEVICE: no CUDA-capable device is detected
 [hevc_cuvid @ 000002a1631dc380] cuvid decode callback error
 Error while decoding stream #0:0: Generic error in an external library
 [hevc_cuvid @ 000002a1631dc380] cuvid decode callback error
 Error while decoding stream #0:0: Generic error in an external library
 [hevc_cuvid @ 000002a1631dc380] cuvid decode callback error
 Error while decoding stream #0:0: Generic error in an external library
 .
 .
 .
 [hevc_cuvid @ 000002a1631dc380] cuvid decode callback error
 Error while decoding stream #0:0: Generic error in an external library
 [hevc_cuvid @ 000002a1631dc380] cuvid decode callback error
 Error while decoding stream #0:0: Generic error in an external library
 [hevc_cuvid @ 000002a1631dc380] cuvid decode callback error
 Error while decoding stream #0:0: Generic error in an external library
 Finishing stream 0:0 without any data written to it.
 Output #0, null, to 'pipe:':
   Metadata:
     encoder         : Lavf58.32.104
     Stream #0:0: Video: wrapped_avframe, yuv444p, 1920x1080, q=2-31, 200
 kb/s, 25 fps, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc58.57.100 wrapped_avframe
 frame=    0 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed=
 0x
 video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 Output file is empty, nothing was encoded (check -ss / -t / -frames
 parameters if used)
 Conversion failed!
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8174>
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