[FFmpeg-trac] #8078(ffmpeg:new): Closed captions removed when decoding with NVDEC

FFmpeg trac at avcodec.org
Mon Aug 12 18:47:37 EEST 2019


#8078: Closed captions removed when decoding with NVDEC
-------------------------------------+-------------------------------------
             Reporter:  Canta        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:  git-
             Keywords:  nvidia,      |  master
  nvdec, cc                          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 NVDEC seems to remove CEA-608/708 captions from stream.

 Related:
 https://devtalk.nvidia.com/default/topic/1025092/video-codec-and-optical-
 flow-sdk/nvenc-with-ffmpeg-for-transcoding-closed-caption-text-display-
 order-issue-while-using-quot-bf-2-quot-/
 http://trac.ffmpeg.org/ticket/6802
 http://trac.ffmpeg.org/ticket/6726

 Please note the difference between NVDEC (decoding) and NVENC (encoding).
 This ticket is about the DEcoding system, while the other tickets are
 ENcoding related.


 How to reproduce:

 {{{
 root at cdn1:/# nvidia-smi
 Fri Aug  9 21:18:57 2019
 +-----------------------------------------------------------------------------+
 | NVIDIA-SMI 430.40       Driver Version: 430.40       CUDA Version: 10.1
 |
 |-------------------------------+----------------------+----------------------+
 | GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr.
 ECC |
 | Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute
 M. |
 |===============================+======================+======================|
 |   0  Quadro M4000        Off  | 00000000:05:00.0 Off |
 N/A |
 | 55%   65C    P0    49W / 120W |   2640MiB /  8126MiB |     48%
 Default |
 +-------------------------------+----------------------+----------------------+

 +-----------------------------------------------------------------------------+
 | Processes:                                                       GPU
 Memory |
 |  GPU       PID   Type   Process name                             Usage
 |
 |=============================================================================|
 +-----------------------------------------------------------------------------+


 root at cdn1:/# wget "http://samples.ffmpeg.org/MPEG-
 VOB/ClosedCaptions/Starship_Troopers.vob"
 --2019-08-09 21:19:40--  http://samples.ffmpeg.org/MPEG-
 VOB/ClosedCaptions/Starship_Troopers.vob
 Resolving samples.ffmpeg.org (samples.ffmpeg.org)... 79.124.17.100
 Connecting to samples.ffmpeg.org (samples.ffmpeg.org)|79.124.17.100|:80...
 connected.
 HTTP request sent, awaiting response... 200 OK
 Length: 29618176 (28M)
 Saving to: 'Starship_Troopers.vob'

 Starship_Troopers.vob
 100%[=====================================================================================================>]
 28.25M  7.24MB/s    in 3.9s

 2019-08-09 21:19:45 (7.24 MB/s) - 'Starship_Troopers.vob' saved
 [29618176/29618176]



 root at cdn1:/# ffprobe Starship_Troopers.vob
 ffprobe version N-94476-gf12e662 Copyright (c) 2007-2019 the FFmpeg
 developers
   built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
   configuration: --prefix=./ --disable-shared --extra-
 cflags=-I/usr/local/include --extra-
 cflags=-I/usr/local/cuda-8.0/targets/x86_64-linux/include --extra-
 cflags=-I../nvidia/cudautils --extra-
 ldflags=-L/usr/local/cuda-8.0/targets/x86_64-linux/lib --extra-
 ldflags=-L../nvidia/cudautils --enable-nonfree --enable-gpl --enable-
 version3 --enable-avresample --enable-avisynth --enable-openal --enable-
 opencl --enable-opengl --enable-libnpp --enable-nvenc --enable-libxvid
 --enable-libxml2 --enable-cuda --enable-cuda-sdk --enable-vaapi --enable-
 vdpau --enable-libx264 --enable-libx265 --enable-libass --enable-
 libwavpack --enable-libsoxr --enable-libfdk-aac --enable-libfreetype
 --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis
 --enable-libvpx --enable-librtmp --enable-libssh --enable-openssl
 --enable-omx-rpi --enable-omx --enable-libsrt
   libavutil      56. 33.100 / 56. 33.100
   libavcodec     58. 55.100 / 58. 55.100
   libavformat    58. 30.100 / 58. 30.100
   libavdevice    58.  9.100 / 58.  9.100
   libavfilter     7. 58.100 /  7. 58.100
   libavresample   4.  0.  0 /  4.  0.  0
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
   libpostproc    55.  6.100 / 55.  6.100
 Input #0, mpeg, from 'Starship_Troopers.vob':
   Duration: 00:00:51.30, start: 1986.626100, bitrate: 4618 kb/s
     Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, top first),
 720x480 [SAR 32:27 DAR 16:9], Closed Captions, 29.97 fps, 59.94 tbr, 90k
 tbn, 59.94 tbc
     Stream #0:1[0x83]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
     Stream #0:2[0x82]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
     Stream #0:3[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
     Stream #0:4[0x81]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s
     Stream #0:5[0x20]: Subtitle: dvd_subtitle
     Stream #0:6[0x22]: Subtitle: dvd_subtitle



 root at cdn1:/# ffmpeg -y -i Starship_Troopers.vob -map 'i:0x1e0' -c:v
 h264_nvenc -f mpegts out1.mp4
 ffmpeg version N-94476-gf12e662 Copyright (c) 2000-2019 the FFmpeg
 developers
   built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
   configuration: --prefix=./ --disable-shared --extra-
 cflags=-I/usr/local/include --extra-
 cflags=-I/usr/local/cuda-8.0/targets/x86_64-linux/include --extra-
 cflags=-I../nvidia/cudautils --extra-
 ldflags=-L/usr/local/cuda-8.0/targets/x86_64-linux/lib --extra-
 ldflags=-L../nvidia/cudautils --enable-nonfree --enable-gpl --enable-
 version3 --enable-avresample --enable-avisynth --enable-openal --enable-
 opencl --enable-opengl --enable-libnpp --enable-nvenc --enable-libxvid
 --enable-libxml2 --enable-cuda --enable-cuda-sdk --enable-vaapi --enable-
 vdpau --enable-libx264 --enable-libx265 --enable-libass --enable-
 libwavpack --enable-libsoxr --enable-libfdk-aac --enable-libfreetype
 --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis
 --enable-libvpx --enable-librtmp --enable-libssh --enable-openssl
 --enable-omx-rpi --enable-omx --enable-libsrt
   libavutil      56. 33.100 / 56. 33.100
   libavcodec     58. 55.100 / 58. 55.100
   libavformat    58. 30.100 / 58. 30.100
   libavdevice    58.  9.100 / 58.  9.100
   libavfilter     7. 58.100 /  7. 58.100
   libavresample   4.  0.  0 /  4.  0.  0
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
   libpostproc    55.  6.100 / 55.  6.100
 Input #0, mpeg, from 'Starship_Troopers.vob':
   Duration: 00:00:51.30, start: 1986.626100, bitrate: 4618 kb/s
     Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, top first),
 720x480 [SAR 32:27 DAR 16:9], Closed Captions, 29.97 fps, 59.94 tbr, 90k
 tbn, 59.94 tbc
     Stream #0:1[0x83]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
     Stream #0:2[0x82]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
     Stream #0:3[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
     Stream #0:4[0x81]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s
     Stream #0:5[0x20]: Subtitle: dvd_subtitle
     Stream #0:6[0x22]: Subtitle: dvd_subtitle
 Stream mapping:
   Stream #0:0 -> #0:0 (mpeg2video (native) -> h264 (h264_nvenc))
 Press [q] to stop, [?] for help
 Output #0, mpegts, to 'out1.mp4':
   Metadata:
     encoder         : Lavf58.30.100
     Stream #0:0: Video: h264 (h264_nvenc) (Main), yuv420p, 720x480 [SAR
 32:27 DAR 16:9], q=-1--1, 2000 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
     Metadata:
       encoder         : Lavc58.55.100 h264_nvenc
     Side data:
       cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 4000000
 vbv_delay: -1
 [mpeg @ 0x5580626fca00] New subtitle stream 0:7 at pos:8497166 and
 DTS:1999.51s/s speed=17.9x
 [mpeg2video @ 0x55806273b080] ac-tex damaged at 3 270:47.48
 bitrate=1678.4kbits/s speed=23.7x
 [mpeg2video @ 0x55806273b080] Warning MVs not available
 [mpeg2video @ 0x55806273b080] concealing 135 DC, 135 AC, 135 MV errors in
 I frame
 Starship_Troopers.vob: corrupt decoded frame in stream 0
 frame= 1229 fps=575 q=23.0 Lsize=   10725kB time=00:00:51.28
 bitrate=1713.2kbits/s speed=  24x
 video:9811kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 9.312987%




 root at cdn1:/# ffprobe out1.mp4
 ffprobe version N-94476-gf12e662 Copyright (c) 2007-2019 the FFmpeg
 developers
   built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
   configuration: --prefix=./ --disable-shared --extra-
 cflags=-I/usr/local/include --extra-
 cflags=-I/usr/local/cuda-8.0/targets/x86_64-linux/include --extra-
 cflags=-I../nvidia/cudautils --extra-
 ldflags=-L/usr/local/cuda-8.0/targets/x86_64-linux/lib --extra-
 ldflags=-L../nvidia/cudautils --enable-nonfree --enable-gpl --enable-
 version3 --enable-avresample --enable-avisynth --enable-openal --enable-
 opencl --enable-opengl --enable-libnpp --enable-nvenc --enable-libxvid
 --enable-libxml2 --enable-cuda --enable-cuda-sdk --enable-vaapi --enable-
 vdpau --enable-libx264 --enable-libx265 --enable-libass --enable-
 libwavpack --enable-libsoxr --enable-libfdk-aac --enable-libfreetype
 --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis
 --enable-libvpx --enable-librtmp --enable-libssh --enable-openssl
 --enable-omx-rpi --enable-omx --enable-libsrt
   libavutil      56. 33.100 / 56. 33.100
   libavcodec     58. 55.100 / 58. 55.100
   libavformat    58. 30.100 / 58. 30.100
   libavdevice    58.  9.100 / 58.  9.100
   libavfilter     7. 58.100 /  7. 58.100
   libavresample   4.  0.  0 /  4.  0.  0
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
   libpostproc    55.  6.100 / 55.  6.100
 Input #0, mpegts, from 'out1.mp4':
   Duration: 00:00:51.32, start: 1.400000, bitrate: 1712 kb/s
   Program 1
     Metadata:
       service_name    : Service01
       service_provider: FFmpeg
     Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B),
 yuv420p(progressive), 720x480 [SAR 32:27 DAR 16:9], Closed Captions, 29.97
 fps, 29.97 tbr, 90k tbn, 59.94 tbc




 root at cdn1:/# ffmpeg -y -c:v mpeg2_cuvid -i Starship_Troopers.vob -map
 'i:0x1e0' -c:v h264_nvenc -f mpegts out2.mp4
 ffmpeg version N-94476-gf12e662 Copyright (c) 2000-2019 the FFmpeg
 developers
   built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
   configuration: --prefix=./ --disable-shared --extra-
 cflags=-I/usr/local/include --extra-
 cflags=-I/usr/local/cuda-8.0/targets/x86_64-linux/include --extra-
 cflags=-I../nvidia/cudautils --extra-
 ldflags=-L/usr/local/cuda-8.0/targets/x86_64-linux/lib --extra-
 ldflags=-L../nvidia/cudautils --enable-nonfree --enable-gpl --enable-
 version3 --enable-avresample --enable-avisynth --enable-openal --enable-
 opencl --enable-opengl --enable-libnpp --enable-nvenc --enable-libxvid
 --enable-libxml2 --enable-cuda --enable-cuda-sdk --enable-vaapi --enable-
 vdpau --enable-libx264 --enable-libx265 --enable-libass --enable-
 libwavpack --enable-libsoxr --enable-libfdk-aac --enable-libfreetype
 --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis
 --enable-libvpx --enable-librtmp --enable-libssh --enable-openssl
 --enable-omx-rpi --enable-omx --enable-libsrt
   libavutil      56. 33.100 / 56. 33.100
   libavcodec     58. 55.100 / 58. 55.100
   libavformat    58. 30.100 / 58. 30.100
   libavdevice    58.  9.100 / 58.  9.100
   libavfilter     7. 58.100 /  7. 58.100
   libavresample   4.  0.  0 /  4.  0.  0
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
   libpostproc    55.  6.100 / 55.  6.100
 Input #0, mpeg, from 'Starship_Troopers.vob':
   Duration: 00:00:51.30, start: 1986.626100, bitrate: 4618 kb/s
     Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, top first),
 720x480 [SAR 32:27 DAR 16:9], Closed Captions, 29.97 fps, 59.94 tbr, 90k
 tbn, 59.94 tbc
     Stream #0:1[0x83]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
     Stream #0:2[0x82]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
     Stream #0:3[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
     Stream #0:4[0x81]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s
     Stream #0:5[0x20]: Subtitle: dvd_subtitle
     Stream #0:6[0x22]: Subtitle: dvd_subtitle
 Stream mapping:
   Stream #0:0 -> #0:0 (mpeg2video (mpeg2_cuvid) -> h264 (h264_nvenc))
 Press [q] to stop, [?] for help
 Output #0, mpegts, to 'out2.mp4':
   Metadata:
     encoder         : Lavf58.30.100
     Stream #0:0: Video: h264 (h264_nvenc) (Main), nv12, 720x480 [SAR 32:27
 DAR 16:9], q=-1--1, 2000 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
     Metadata:
       encoder         : Lavc58.55.100 h264_nvenc
     Side data:
       cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 4000000
 vbv_delay: -1
 [mpeg @ 0x55621a00fa40] New subtitle stream 0:7 at pos:8497166 and
 DTS:1999.51s/s speed=10.4x
 frame= 1229 fps=371 q=23.0 Lsize=   10718kB time=00:00:51.35
 bitrate=1709.8kbits/s speed=15.5x
 video:9806kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 9.301291%




 root at cdn1:/# ffprobe out2.mp4
 ffprobe version N-94476-gf12e662 Copyright (c) 2007-2019 the FFmpeg
 developers
   built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
   configuration: --prefix=./ --disable-shared --extra-
 cflags=-I/usr/local/include --extra-
 cflags=-I/usr/local/cuda-8.0/targets/x86_64-linux/include --extra-
 cflags=-I../nvidia/cudautils --extra-
 ldflags=-L/usr/local/cuda-8.0/targets/x86_64-linux/lib --extra-
 ldflags=-L../nvidia/cudautils --enable-nonfree --enable-gpl --enable-
 version3 --enable-avresample --enable-avisynth --enable-openal --enable-
 opencl --enable-opengl --enable-libnpp --enable-nvenc --enable-libxvid
 --enable-libxml2 --enable-cuda --enable-cuda-sdk --enable-vaapi --enable-
 vdpau --enable-libx264 --enable-libx265 --enable-libass --enable-
 libwavpack --enable-libsoxr --enable-libfdk-aac --enable-libfreetype
 --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis
 --enable-libvpx --enable-librtmp --enable-libssh --enable-openssl
 --enable-omx-rpi --enable-omx --enable-libsrt
   libavutil      56. 33.100 / 56. 33.100
   libavcodec     58. 55.100 / 58. 55.100
   libavformat    58. 30.100 / 58. 30.100
   libavdevice    58.  9.100 / 58.  9.100
   libavfilter     7. 58.100 /  7. 58.100
   libavresample   4.  0.  0 /  4.  0.  0
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
   libpostproc    55.  6.100 / 55.  6.100
 Input #0, mpegts, from 'out2.mp4':
   Duration: 00:00:51.38, start: 1.400000, bitrate: 1708 kb/s
   Program 1
     Metadata:
       service_name    : Service01
       service_provider: FFmpeg
     Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B),
 yuv420p(progressive), 720x480 [SAR 32:27 DAR 16:9], 29.97 fps, 29.97 tbr,
 90k tbn, 59.94 tbc



 root at cdn1:/# ffmpeg -y -c:v h264_cuvid -i out1.mp4 -map 'i:0x100' -c:v
 h264_nvenc -f mpegts out3.mp4
 ffmpeg version N-94476-gf12e662 Copyright (c) 2000-2019 the FFmpeg
 developers
   built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
   configuration: --prefix=./ --disable-shared --extra-
 cflags=-I/usr/local/include --extra-
 cflags=-I/usr/local/cuda-8.0/targets/x86_64-linux/include --extra-
 cflags=-I../nvidia/cudautils --extra-
 ldflags=-L/usr/local/cuda-8.0/targets/x86_64-linux/lib --extra-
 ldflags=-L../nvidia/cudautils --enable-nonfree --enable-gpl --enable-
 version3 --enable-avresample --enable-avisynth --enable-openal --enable-
 opencl --enable-opengl --enable-libnpp --enable-nvenc --enable-libxvid
 --enable-libxml2 --enable-cuda --enable-cuda-sdk --enable-vaapi --enable-
 vdpau --enable-libx264 --enable-libx265 --enable-libass --enable-
 libwavpack --enable-libsoxr --enable-libfdk-aac --enable-libfreetype
 --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis
 --enable-libvpx --enable-librtmp --enable-libssh --enable-openssl
 --enable-omx-rpi --enable-omx --enable-libsrt
   libavutil      56. 33.100 / 56. 33.100
   libavcodec     58. 55.100 / 58. 55.100
   libavformat    58. 30.100 / 58. 30.100
   libavdevice    58.  9.100 / 58.  9.100
   libavfilter     7. 58.100 /  7. 58.100
   libavresample   4.  0.  0 /  4.  0.  0
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
   libpostproc    55.  6.100 / 55.  6.100
 Input #0, mpegts, from 'out1.mp4':
   Duration: 00:00:51.32, start: 1.400000, bitrate: 1712 kb/s
   Program 1
     Metadata:
       service_name    : Service01
       service_provider: FFmpeg
     Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B),
 yuv420p(progressive), 720x480 [SAR 32:27 DAR 16:9], Closed Captions, 29.97
 fps, 29.97 tbr, 90k tbn, 59.94 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 (h264_cuvid) -> h264 (h264_nvenc))
 Press [q] to stop, [?] for help
 Output #0, mpegts, to 'out3.mp4':
   Metadata:
     encoder         : Lavf58.30.100
     Stream #0:0: Video: h264 (h264_nvenc) (Main), nv12, 720x480 [SAR 32:27
 DAR 16:9], q=-1--1, 2000 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
     Metadata:
       encoder         : Lavc58.55.100 h264_nvenc
     Side data:
       cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 4000000
 vbv_delay: -1
 frame= 1229 fps=427 q=21.0 Lsize=   10752kB time=00:00:51.41
 bitrate=1713.0kbits/s speed=17.9x
 video:9834kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 9.330894%




 root at cdn1:/# ffprobe out3.mp4
 ffprobe version N-94476-gf12e662 Copyright (c) 2007-2019 the FFmpeg
 developers
   built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
   configuration: --prefix=./ --disable-shared --extra-
 cflags=-I/usr/local/include --extra-
 cflags=-I/usr/local/cuda-8.0/targets/x86_64-linux/include --extra-
 cflags=-I../nvidia/cudautils --extra-
 ldflags=-L/usr/local/cuda-8.0/targets/x86_64-linux/lib --extra-
 ldflags=-L../nvidia/cudautils --enable-nonfree --enable-gpl --enable-
 version3 --enable-avresample --enable-avisynth --enable-openal --enable-
 opencl --enable-opengl --enable-libnpp --enable-nvenc --enable-libxvid
 --enable-libxml2 --enable-cuda --enable-cuda-sdk --enable-vaapi --enable-
 vdpau --enable-libx264 --enable-libx265 --enable-libass --enable-
 libwavpack --enable-libsoxr --enable-libfdk-aac --enable-libfreetype
 --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis
 --enable-libvpx --enable-librtmp --enable-libssh --enable-openssl
 --enable-omx-rpi --enable-omx --enable-libsrt
   libavutil      56. 33.100 / 56. 33.100
   libavcodec     58. 55.100 / 58. 55.100
   libavformat    58. 30.100 / 58. 30.100
   libavdevice    58.  9.100 / 58.  9.100
   libavfilter     7. 58.100 /  7. 58.100
   libavresample   4.  0.  0 /  4.  0.  0
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
   libpostproc    55.  6.100 / 55.  6.100
 Input #0, mpegts, from 'out3.mp4':
   Duration: 00:00:51.45, start: 1.400000, bitrate: 1711 kb/s
   Program 1
     Metadata:
       service_name    : Service01
       service_provider: FFmpeg
     Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B),
 yuv420p(progressive), 720x480 [SAR 32:27 DAR 16:9], 29.97 fps, 29.97 tbr,
 90k tbn, 59.94 tbc

 }}}

 Those steps should be reproducible on a machine with nvidia card by just
 copying and pasting the commands. Please note the ffprobe output after
 each test: with software DEcoding, even when using hardware ENcoding, the
 stream deails say "Closed Captions". With hardware DEcoding, closed
 captions are never detected again, no matter the input stream codec (in
 the example, I've tested mpeg2 and h264).

 I believe this was fixed in another (now closed) issue, but only for
 ENcoding.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8078>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker


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