./ffmpeg -re -hwaccel cuvid -c:v hevc_cuvid -i /data/public/media/HEVC4K60.ts -ac 2 -ar 48000 -f decklink -vf hwdownload -pix_fmt uyvy422 'DeckLink 8K Pro (1)' -v verbose
ffmpeg version N-94012-ge62f625 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 4.6.4 (crosstool-NG 1.18.0) 20130102 (prerelease)
  configuration: --prefix=/usr/local/ffmpeg --enable-shared --enable-libfdk-aac --enable-librtmp --disable-libvorbis --disable-encoder=vorbis --disable-decoder=vorbis --enable-libmp3lame --disable-debug --enable-nonfree --enable-gpl --disable-ffplay --enable-pthreads --enable-ffmpeg --enable-avresample --disable-vdpau --disable-vaapi --disable-libmfx --enable-libx264 --enable-openssl --enable-decklink --enable-nvdec --enable-nvenc --enable-libnpp --enable-cuda --extra-cflags=-I/root/X/tmp/cuda_dev/include --extra-ldflags=-L/root/X/tmp/cuda_dev/lib
  libavutil      56. 28.100 / 56. 28.100
  libavcodec     58. 52.102 / 58. 52.102
  libavformat    58. 27.103 / 58. 27.103
  libavdevice    58.  7.100 / 58.  7.100
  libavfilter     7. 55.100 /  7. 55.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  4.101 /  5.  4.101
  libswresample   3.  4.100 /  3.  4.100
  libpostproc    55.  4.100 / 55.  4.100
Input #0, mpegts, from '/data/public/media/HEVC4K60.ts':
  Duration: 00:10:30.40, start: 0.602033, bitrate: 12384 kb/s
  Program 1
    Metadata:
      service_name    : Big Buck Bunny, Sunflower version
      service_provider: FFmpeg
    Stream #0:0[0x100]: Video: hevc (Main), 1 reference frame ([36][0][0][0] / 0x0024), yuv420p(tv), 3840x2160 [SAR 1:1 DAR 16:9], 60 fps, 60 tbr, 90k tbn, 60 tbc
    Stream #0:1[0x101](und): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 201 kb/s
[hevc_cuvid @ 0x6a1d80] Initializing cuvid hwaccel
[AVBSFContext @ 0x1076d80] The input looks like it is Annex B already
[hevc_cuvid @ 0x6a1d80] CUVID capabilities for hevc_cuvid:
[hevc_cuvid @ 0x6a1d80] 8 bit: supported: 1, min_width: 144, max_width: 8192, min_height: 144, max_height: 8192
[hevc_cuvid @ 0x6a1d80] 10 bit: supported: 1, min_width: 144, max_width: 8192, min_height: 144, max_height: 8192
[hevc_cuvid @ 0x6a1d80] 12 bit: supported: 1, min_width: 144, max_width: 8192, min_height: 144, max_height: 8192
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (hevc_cuvid) -> wrapped_avframe (native))
  Stream #0:1 -> #0:1 (aac (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
[hevc_cuvid @ 0x6a1d80] Initializing cuvid hwaccel
[hevc_cuvid @ 0x6a1d80] Formats: Original: cuda | HW: cuda | SW: nv12
[graph 0 input from stream 0:0 @ 0x16d19c0] w:3840 h:2160 pixfmt:cuda tb:1/90000 fr:60/1 sar:1/1 sws_param:flags=2
[hwdownload @ 0x112d880] Invalid output format uyvy422 for hwframe download.
[Parsed_hwdownload_0 @ 0x16d14c0] Failed to configure output pad on Parsed_hwdownload_0
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
[AVIOContext @ 0x6a4700] Statistics: 6549936 bytes read, 3 seeks
Conversion failed!