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    21 juin 2013, par

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    16 avril 2011, par

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    Si vous souhaitez utiliser cette archive pour une installation en mode ferme, il vous faudra également procéder à d’autres modifications (...)

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    31 janvier 2010, par

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Sur d’autres sites (7366)

  • How to play two videos side by side using FFmpeg ?

    29 juin 2020, par user1hjgjhgjhggjhg

    Hello I want to create a duet video feature like tiktok. I am using FFmpeg. I have tried this code

    


    ffmpeg \
  -i movie_output.mp4 \
  -i movie_output.mp4 \
  -filter_complex  \
    "nullsrc=size=360x480[base]; 
     [0:v] setpts=PTS-STARTPTS, scale=360x480, crop=180:480:90:0[left];
     [1:v] setpts=PTS-STARTPTS, scale=360x480, crop=180:480:90:0 [right];
     [base][left] overlay=x=0:y=0[base1];
     [base1][right] overlay=shortest=1:x=180:y=0" \
  -c:v libx264 \
  -y result.mp4


    


    It gives me this error :

    


    No such filter: ' '
Error initializing complex filters.
Invalid argument


    


    Whole output

    


    ubuntu@ip-171-xx-xx-xxx: ffmpeg -i movie_output.mp4 -i movie_output.mp4 -filter_complex  "nullsrc=size=360x480[base]; \ [0:v] setpts=PTS-STARTPTS, scale=360x480, crop=180:480:90:0[left]; \ [1:v] setpts=PTS-STARTPTS, scale=360x480, crop=180:480:90:0 [right]; \ [base][left] overlay=x=0:y=0[base1]; \ [base1][right] overlay=shortest=1:x=180:y=0" -c:v libx264 -y result.mp4


ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --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-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --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-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'movie_output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    comment         : vid:v090440c0000brppph37mt2vmmsj1dig
  Duration: 00:00:08.04, start: 0.000000, bitrate: 1135 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 540x960 [SAR 1:1 DAR 9:16], 996 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'movie_output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    comment         : vid:v090440c0000brppph37mt2vmmsj1dig
  Duration: 00:00:08.04, start: 0.000000, bitrate: 1135 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 540x960 [SAR 1:1 DAR 9:16], 996 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[AVFilterGraph @ 0x560fd395e2e0] No such filter: ' '
Error initializing complex filters.
Invalid argument


    


    I have tried this as well

    


    ffmpeg \
  -report \
  -i "movie_output.mp4" \
  -i "movie_output.mp4" \
  -an \
  -filter_complex \
     "[0:v]trim=start=0:end=9,setpts=PTS-STARTPTS[firstclip];
      [1:v]trim=start=1,setpts=PTS-STARTPTS[secondclip];
      [0:v]trim=start=9:end=10,setpts=PTS-STARTPTS[fadeoutsrc];
      [1:v]trim=start=0:end=1,setpts=PTS-STARTPTS[fadeinsrc];
      [fadeinsrc]format=pix_fmts=yuva420p,fade=t=in:st=0:d=1:alpha=1[fadein];
      [fadeoutsrc]format=pix_fmts=yuva420p,fade=t=out:st=0:d=1:alpha=1[fadeout];
      [fadein]fifo[fadeinfifo];
      [fadeout]fifo[fadeoutfifo];
      [fadeoutfifo][fadeinfifo]overlay[crossfade];
      [firstclip][crossfade][secondclip]concat=n=3" \
  outputname.mp4


    


    Output :

    


    ffmpeg started on 2020-06-27 at 10:11:41
Report written to "ffmpeg-20200627-101141.log"
ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --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-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --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-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'movie_output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    comment         : vid:v090440c0000brppph37mt2vmmsj1dig
  Duration: 00:00:08.04, start: 0.000000, bitrate: 1135 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 540x960 [SAR 1:1 DAR 9:16], 996 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'movie_output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    comment         : vid:v090440c0000brppph37mt2vmmsj1dig
  Duration: 00:00:08.04, start: 0.000000, bitrate: 1135 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 540x960 [SAR 1:1 DAR 9:16], 996 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[NULL @ 0x562dea344220] Unable to find a suitable output format for ' -filter_complex'
 -filter_complex: Invalid argument


    


    This code gives this error

    


    Unable to find a suitable output format for ' -filter_complex'
     -filter_complex: Invalid argument


    


    Anyone can help ?

    


  • Make a duet video like tiktok

    27 juin 2020, par user1hjgjhgjhggjhg

    Hello I want to create a duet video feature like tiktok. I am using FFmepg. I have tried this code

    


    ffmpeg -i movie_output.mp4 -i movie_output.mp4 -filter_complex  "nullsrc=size=360x480[base]; \ [0:v] setpts=PTS-STARTPTS, scale=360x480, crop=180:480:90:0[left]; \ [1:v] setpts=PTS-STARTPTS, scale=360x480, crop=180:480:90:0 [right]; \ [base][left] overlay=x=0:y=0[base1]; \ [base1][right] overlay=shortest=1:x=180:y=0" -c:v libx264 -y result.mp4


    


    It gives me this error

    


    No such filter: ' '
Error initializing complex filters.
Invalid argument


    


    Whole output

    


    ubuntu@ip-171-xx-xx-xxx: ffmpeg -i movie_output.mp4 -i movie_output.mp4 -filter_complex  "nullsrc=size=360x480[base]; \ [0:v] setpts=PTS-STARTPTS, scale=360x480, crop=180:480:90:0[left]; \ [1:v] setpts=PTS-STARTPTS, scale=360x480, crop=180:480:90:0 [right]; \ [base][left] overlay=x=0:y=0[base1]; \ [base1][right] overlay=shortest=1:x=180:y=0" -c:v libx264 -y result.mp4


ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --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-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --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-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'movie_output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    comment         : vid:v090440c0000brppph37mt2vmmsj1dig
  Duration: 00:00:08.04, start: 0.000000, bitrate: 1135 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 540x960 [SAR 1:1 DAR 9:16], 996 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'movie_output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    comment         : vid:v090440c0000brppph37mt2vmmsj1dig
  Duration: 00:00:08.04, start: 0.000000, bitrate: 1135 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 540x960 [SAR 1:1 DAR 9:16], 996 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[AVFilterGraph @ 0x560fd395e2e0] No such filter: ' '
Error initializing complex filters.
Invalid argument


    


    I have tried this as well

    


    ffmpeg -report -i "movie_output.mp4" -i "movie_output.mp4" -an \ -filter_complex \ "[0:v]trim=start=0:end=9,setpts=PTS-STARTPTS[firstclip]; \ [1:v]trim=start=1,setpts=PTS-STARTPTS[secondclip]; \ [0:v]trim=start=9:end=10,setpts=PTS-STARTPTS[fadeoutsrc]; \ [1:v]trim=start=0:end=1,setpts=PTS-STARTPTS[fadeinsrc]; \ [fadeinsrc]format=pix_fmts=yuva420p,fade=t=in:st=0:d=1:alpha=1[fadein]; \ [fadeoutsrc]format=pix_fmts=yuva420p,fade=t=out:st=0:d=1:alpha=1[fadeout]; \ [fadein]fifo[fadeinfifo]; \ [fadeout]fifo[fadeoutfifo]; \ [fadeoutfifo][fadeinfifo]overlay[crossfade]; \ [firstclip][crossfade][secondclip]concat=n=3" \ outputname.mp4
ffmpeg started on 2020-06-27 at 10:11:41
Report written to "ffmpeg-20200627-101141.log"
ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --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-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --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-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'movie_output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    comment         : vid:v090440c0000brppph37mt2vmmsj1dig
  Duration: 00:00:08.04, start: 0.000000, bitrate: 1135 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 540x960 [SAR 1:1 DAR 9:16], 996 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'movie_output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    comment         : vid:v090440c0000brppph37mt2vmmsj1dig
  Duration: 00:00:08.04, start: 0.000000, bitrate: 1135 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 540x960 [SAR 1:1 DAR 9:16], 996 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[NULL @ 0x562dea344220] Unable to find a suitable output format for ' -filter_complex'
 -filter_complex: Invalid argument


    


    This code gives this error

    


    Unable to find a suitable output format for ' -filter_complex'
     -filter_complex: Invalid argument


    


    Anyone can help ?

    


  • ffmpeg nvdec not available when adding subtitles to mp4

    17 février 2019, par whatdoineed2do

    I have a mp4 video that I want to BURN-IN subtitles (from a .ass file and via -vf ass=/tmp/conf-notes.ass) with ffmpeg on a machine with a GTX1060 card however ffmpeg reports that it fails to create the NVDEC decoder.

    [h264 @ 0xcb9380] Error creating a NVDEC decoder: 1
    [h264 @ 0xcb9380] Failed setup for format cuda: hwaccel initialisation returned error.

    The output file is generated ok but during the creation the CPU is used heavily (I assume for decode) - if I drop the -vf ass=/tmp/conf-notes.ass and perform an mp4->mp4 reencode there are no problems.

    I want to know what I am missing from my command to allow the GPU to perform the decode when an .ass file is added to the chain.

    $ ffmpeg -hwaccel cuvid -i 2019-01-conferance.mp4 -vf ass=/tmp/conf-notes.ass -c:a copy -preset llhq -rc vbr_hq -vb 2M -minrate 500k -maxrate 12M -c:v h264_nvenc export.mp4
    ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
     built with gcc 8 (GCC)
     configuration: --arch=x86_64 --bindir=/usr/bin --datadir=/usr/share/ffmpeg --disable-debug --disable-static --disable-stripping --enable-alsa --enable-avfilter --enable-avresample --enable-bzlib --enable-decklink --enable-doc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gpl --enable-iconv --enable-libass --enable-libbluray --enable-libcdio --enable-libdc1394 --enable-libdrm --enable-libfdk-aac --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc --enable-libkvazaar --enable-libmfx --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librsvg --enable-librtmp --enable-librubberband --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtesseract --enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxcb-shm --enable-libxcb-xfixes --enable-libxcb-shape --enable-libxml2 --enable-libxvid --enable-libzvbi --enable-lv2 --enable-lzma --enable-libndi_newtek --enable-nonfree --enable-openal --enable-opencl --enable-opengl --enable-postproc --enable-pthreads --enable-sdl2 --enable-shared --enable-version3 --enable-xlib --enable-zlib --extra-cflags=-I/usr/include/cuda --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --optflags='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection' --prefix=/usr --shlibdir=/usr/lib64 --enable-cuda --enable-cuvid --enable-libnpp --enable-nvdec --enable-nvenc --enable-runtime-cpudetect
     libavutil      56. 14.100 / 56. 14.100
     libavcodec     58. 18.100 / 58. 18.100
     libavformat    58. 12.100 / 58. 12.100
     libavdevice    58.  3.100 / 58.  3.100
     libavfilter     7. 16.100 /  7. 16.100
     libavresample   4.  0.  0 /  4.  0.  0
     libswscale      5.  1.100 /  5.  1.100
     libswresample   3.  1.100 /  3.  1.100
     libpostproc    55.  1.100 / 55.  1.100
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2019-01-conferance.mp4':
     Metadata:
       major_brand     : mp42
       minor_version   : 0
       compatible_brands: isommp42
       creation_time   : 2019-01-12T00:00:06.000000Z
     Duration: 00:00:24.07, start: 0.000000, bitrate: 11542 kb/s
       Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 11350 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
       Metadata:
         creation_time   : 2019-01-12T00:00:07.000000Z
         handler_name    : Mainconcept MP4 Video Media Handler
         encoder         : AVC Coding
       Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
       Metadata:
         creation_time   : 2019-01-12T00:00:07.000000Z
         handler_name    : Mainconcept MP4 Sound Media Handler
    Stream mapping:
     Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_nvenc))
     Stream #0:1 -> #0:1 (copy)
    Press [q] to stop, [?] for help
    [h264 @ 0xcb9380] Error creating a NVDEC decoder: 1
    [h264 @ 0xcb9380] Failed setup for format cuda: hwaccel initialisation returned error.
    [Parsed_ass_0 @ 0x1241c00] Shaper: FriBidi 1.0.2 (SIMPLE) HarfBuzz-ng 1.7.5 (COMPLEX)
    [Parsed_ass_0 @ 0x1241c00] Using font provider fontconfig
    [Parsed_ass_0 @ 0x1241c00] Added subtitle file: '/tmp/conf-notes.ass' (2 styles, 101 events)

    The .ass file has been generated from a .srt file via ffmpeg -i foo.srt foo.ass