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• I have a problem withInvalid file index 1 in filtergraph description

  17 avril 2019, par Davide

  This is my code :

  ffmpeg -i wireframe-spendo.mov palette.png -filter_complex fps=25,scale=800:600:flags=lanczos[x],[x][1:v]paletteuse wireframe-spendo.gif

  but after then :

  ffmpeg -i wireframe-spendo.mov palette.png -filter_complex fps=25,scale=800:600:flags=lanczos[x],[x][1:v]paletteuse wireframe-spendo.gif
  
  ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'wireframe-spendo.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      creation_time   : 2019-04-17T09:38:24.000000Z
  
      com.apple.quicktime.make: Apple
  
      com.apple.quicktime.model: iMac12,2
  
      com.apple.quicktime.software: Mac OS X 10.13.6 (17G6029)
  
      com.apple.quicktime.creationdate: 2019-04-17T11:37:00+0200
  
    Duration: 00:00:16.42, start: 0.000000, bitrate: 3170 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1476x1074 [SAR 1:1 DAR 246:179], 3163 kb/s, 60 fps, 60 tbr, 6k tbn, 12k tbc (default)
  
      Metadata:
  
        creation_time   : 2019-04-17T09:38:24.000000Z
  
        handler_name    : Core Media Video
  
        encoder         : H.264

  output terminal says :

  Invalid file index 1 in filtergraph description fps=25,scale=800:600:flags=lanczos[x],[x][1:v]paletteuse.

• streaming an mkv file while processing with ffmpeg

  2 avril 2019, par Phani Rithvij

  What I want to do :

  • I want to play an mkv video in Firefox.
  • But Firefox doesn’t support the mkv format.

  So I’ve searched a lot and found that,
  I could stream instead of playing the video following these steps.

  • mkv can be converted to an m3u8 using FFmpeg
  • The m3u8 points towards ts segment files
  • then use hls.js on the browser side to play the video

  But the catch is I want to do this programmatically.

  What I actually want to do :

  Steps

  • the client uploads a huge (>1 GB) mkv file to the client’s server (server is the client’s machine itself)

  • after the upload is done,

  • client requests to play the video.

  • the server starts transcoding and sends the client the m3u8 stream immediately instead of making the client wait for the transcoding to complete.

  • the client should be able to seek the video. (the most IMPORTANT part)

  It is possible as Emby and Plex both have implemented it.

  I was able to get this to work in chrome as it supports playing some mkv files.
  I wrote a node js server that accepts Range header and pseudo-streams the video.

  A gist

  But as I’ve mentioned Firefox says NO to mkv.

  So I tried the hls thing but I couldn’t quite get the command to generate the stream and also play on the fly.

  I started this on a command line

  ffmpeg -i ../stream.mkv -hls_list_size 0 -acodec copy -vcodec copy file.m3u8

  and a simple http-server on another shell instance

  My index.html file

      
  
      
  
          <code class="echappe-js">&lt;script src='http://stackoverflow.com/feeds/tag/hls.js'&gt;&lt;/script&gt;
          
  
  &lt;script&gt;<br />
  
              var video = document.getElementById('video');<br />
  
              if(Hls.isSupported()) {<br />
  
                  var hls = new Hls();<br />
  
                  hls.loadSource('file.m3u8');<br />
  
                  hls.attachMedia(video);<br />
  
                  hls.on(Hls.Events.MANIFEST_PARSED,function() {<br />
  
                      video.play();<br />
  
                  });<br />
  
              } else if (video.canPlayType('application/vnd.apple.mpegurl')) {<br />
  
                  video.src = 'file.m3u8';<br />
  
                  video.addEventListener('loadedmetadata',function() {<br />
  
                      video.play();<br />
  
                  });<br />
  
              }<br />
  
          &lt;/script&gt;
  

  and while it was running I went ahead and requested the server.

  I was able to get the video but It only seeks as far it’s converted into the ts files.

  And it’s random and the video length keeps increasing. It won’t play sometimes and after the FFmpeg is done converting to m3u8 the video plays if I refresh the webpage.

  I think this has to do with the continuous overwriting of the m3u8 file.
  is there a way to predetermine the file contents of m3u8 and fill it up ?

  I want to be able to seek even further and somehow spawn another FFmpeg process
  to start from that timestamp of the video ? How could I approach the seeking part ?

  So what I’d like to do again is

  • I want to request the server to play a video file
  • It spawns a child process FFmpeg that does the transcoding
  • Sends the client the stream
  • The client should be able to seek to the end and it should play the thing.

• Subtitles in ffmpeg/libavfilter

  15 juin 2021, par Captain Jack

  I have a C program to read video/audio with libav/ffmpeg libraries and decode it.

  



  I am playing with some filters and most work just fine. I can draw text, overlay logos, flip and invert video colours. However, I am having big issues overlaying subtitles.

  



  My filter is very simple.

  



  const char *vfilter_descr = "[in]subtitles=subs.srt[out]";


  



  On the console I get this :

  



  [Parsed_subtitles_0 @ 0x7fe76c703240] Shaper: FriBidi 0.19.7 (SIMPLE) HarfBuzz-ng 2.4.0 (COMPLEX)
[Parsed_subtitles_0 @ 0x7fe76c703240] Using font provider coretext
[Parsed_subtitles_0 @ 0x7fe76c703240] fontselect: (Arial, 400, 0) -> /Library/Fonts/Microsoft/Arial.ttf, -1, ArialMT
[Parsed_subtitles_0 @ 0x7fe76c703240] fontselect: (Arial, 400, 100) -> /Library/Fonts/Microsoft/Arial Italic.ttf, -1, Arial-ItalicMT


  



  ...which somewhat confirms that subtitles are loading, though I am not sure why there are two fonts being loaded ?

  



  However, they are not showing at all - almost as if they never loaded. I tried several different files, including ASS ones but no luck.

  



  ffmpeg version is the latest one.

  



  $ ffmpeg -v
ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3_1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100


  



  Any ideas ?