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• FFmpeg massive data loss when writing large data and swapping segments

  25 avril 2023, par Bohdan Petrenko

  I have an ffmpeg process running which continiously writes audio data to two 30 seconds (for testing, I'm actually planning to use 5 minutes) segments. The problem is that when I write some audio data with length more than size of two segments (60 seconds), 8-17 seconds of audio is lost. Here is how I run FFmpeg and write data :

  


      _ffmpeg = Process.Start(new ProcessStartInfo
    {
        FileName = "ffmpeg",
        Arguments = 
            $"-y -f s16le -ar 48000 -ac {Channels} -i pipe:0 -c:a libmp3lame -f segment -segment_time {BufferDuration} -segment_format mp3 -segment_wrap 2 -reset_timestamps 1 -segment_list \"{_segmentListPath}\" \"{segmentName}\"",
        UseShellExecute = false,
        RedirectStandardInput = true
    })!;
    // Channels is usually 1, BufferDuration is 30


  


  And here is how I write data :

  


  public async Task WriteSilenceAsync(int amount)
{
    if (amount > _size) amount = _size; // _size is 48000 * 1 * 2 * 30 * 2 = 5760000 (size of 1 minute of audio)
    
    var silence = _silenceBuffer.AsMemory(0, amount);
    await _ffmpeg.StandardInput.BaseStream.WriteAsync(silence);
}


  


  I tried to change the ffmpeg parameters and ways I write data. But I haven't found the solution.

  


  I'm sure that the problem is caused by ffmpeg segments, because if I disable segmenting and write audio to a single file, there are no problems with data loss or audio missmatch. I also sure that amount of silence to add in WriteSilenceAsync() method is calculated right. I'm not sure if the problem appears with data length more than 30 seconds but less then 1 minute, but I think it doesn't.

  


  I don't know how to solve this problem and would be glad to see any suggestions or solutions.

  


• Create 4K video with Mjpeg codec in ffmpeg

  25 novembre 2018, par Sulli

  I’m trying to produce a simple 6 seconds video clip by zooming on an image (.mov output, mjpeg codec). I can get this command to work when I set the output to be 1920x1080 :

  ffmpeg -y -r 25 -nostdin -loop 1 -i input.jpg -vf "zoompan=z='min(zoom+0.0015,1.5)':d=700:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)'" -c:v mjpeg -qscale:v 1 -t 6 -s "1920x1080" "test/output.mov"

  but it’s not working anymore when I set the output to be 4K (3840x2160) : the command hangs, is killed or produces a corrupted output.

  My input.jpg resolution is 4240x2832.

  What am I missing ?

  Edit : here is the full log :

  ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --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-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --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-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [mjpeg @ 0x151da00] Changeing bps to 8
  
  Input #0, image2, from 'input.jpg':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: 760992 kb/s
  
      Stream #0:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 4240x2832, 25 tbr, 25 tbn, 25 tbc
  
  [swscaler @ 0x153cf80] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, mov, to 'test/output.mov':
  
    Metadata:
  
      encoder         : Lavf56.40.101
  
      Stream #0:0: Video: mjpeg (jpeg / 0x6765706A), yuvj444p(pc), 3840x2160, q=2-31, 200 kb/s, 25 fps, 12800 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc56.60.100 mjpeg
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
  
  [swscaler @ 0x43c82c0] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 0x43c82c0] Warning: data is not aligned! This can lead to a speedloss
  
  [swscaler @ 0x43c7dc0] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 0x444d0a0] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 0x444cdc0] deprecated pixel format used, make sure you did set range correctly
  
      Last message repeated 5 times
  
  [swscaler @ 0x4439e20] deprecated pixel format used, make sure you did set range correctly
  
      Last message repeated 6 times
  
  [swscaler @ 0x43df9c0] deprecated pixel format used, make sure you did set range correctly
  
      Last message repeated 83 times
  
  [output stream 0:0 @ 0x15240c0] 100 buffers queued in output stream 0:0, something may be wrong.
  
  [swscaler @ 0x43df9c0] deprecated pixel format used, make sure you did set range correctly
  
  creer_videos.sh: line 10:    18 Killed                  ffmpeg -y -r 25 -nostdin -loop 1 -i input.jpg -vf "zoompan=z='min(zoom+0.0015,1.5)':d=700:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)'" -c:v mjpeg -qscale:v 1 -t 6 -s "3840x2160" "test/output.mov"

• Create video from images, add audio and animation within images without FFMPEG in Android

  28 février 2017, par Vivek Bhatt

  I want to create a video from multiple images without using FFMPEG in Android. Also i have to multiple audios over it. And at last there should be some animation within each images. I have tried this using FFMPEG, but it is taking hell lot of time, let say , 4-5 min for 10 photos. Is there any other way for this or any efficient way ?

  There is 3 way process.

  1. First i create video from each image with audio and added text.
  2. Then i concatenate all the videos into a single video.
  3. At last, i add a background audio to the concatenated video.

  I am sharing the commands here :

  1.
  String[] cmds = "-y"
  , "-r", "1", "-vcodec", "mjpeg" ,"-loop", "1", "-t", "1"
  , "-i", image
  , "-i", audio
  , "-vf"
  , "zoompan=z=’if(lte(zoom,1),1.1,max(1.001,zoom-0.0015))’:d=125,drawbox=y=ih/PHI:color=black@0.4:width=iw:height=120:t=max,drawtext=fontfile=/storage/emulated/0/ffmpeg/font.ttf:text="+text+":fontcolor=white:fontsize=60:x=(w-tw)/2:y=(h/PHI)+th"
  , "-c:v", "libx264"
  , "-preset", "ultrafast", "-t", "5", "-c:a", "aac", "-b:a", "128k", "-pix_fmt", "yuv420p"
  , "video1.mp4" ;

  2.

  String cmd = "-y -i video1.mp4 -i video2.mp4 -i video3.mp4 -filter_complex concat=n=3:v=1:a=1 -preset ultrafast concat_video.mp4 ;

  3.

  cmd = "-y -i bg_audio.mp3 -i concat_video.mp4 -shortest -preset ultrafast -filter_complex [a1][a2]amerge,pan=stereo:c0