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• Ffmpeg : Output a video made of several video chunks of the input video

  20 mai 2013, par mad

  I was wondering if it was possible to output a video made of several extracts of the input video.
  For example outputting a video made of the first 10s of each minute of the input.

  I know you can do it programmatically, calling several time ffmpeg with -ss and -t to make the chunks and then merge them, but is it possible to do it in one command using video filters ?

  Thanks !

• Why when creating video file with ffmpeg when playing the video file the video is moving very fast ?

  22 août 2013, par user2704319

  This is how I am using the ffmpeg arguments :

  public void Start(string pathFileName, int BitmapRate)
  
          {
  
              try
  
              {
  
                  string outPath = pathFileName;
  
                  Logger.Write("Output Video File Directory: " + outPath);
  
                  Logger.Write("Frame Rate: " + BitmapRate.ToString());
  
                  p = new NamedPipeServerStream(pipename, PipeDirection.Out, 1, PipeTransmissionMode.Byte);
  
                  b = new byte[1920 * 1080 * 3]; // some buffer for the r g and b of pixels of an image of size 720p
  
  
  
                  ProcessStartInfo psi = new ProcessStartInfo();
  
                  psi.WindowStyle = ProcessWindowStyle.Hidden;
  
                  psi.UseShellExecute = false;
  
                  psi.CreateNoWindow = true;
  
                  psi.FileName = ffmpegFileName; // the ffmpegFileName is the ffmpeg.exe !
  
                  Logger.Write("psi.FileName: " + psi.FileName);
  
                  psi.WorkingDirectory = workingDirectory;
  
                  Logger.Write("psi.WorkingDirectory: " + psi.WorkingDirectory);
  
                  psi.Arguments = @"-f rawvideo -pix_fmt bgr0 -video_size 1920x1080 -i \\.\pipe\mytestpipe -map 0 -c:v libx264 -r " + BitmapRate + " " + outPath;
  
                  Logger.Write("ProcessStartInfo Arguments" + @"-f rawvideo -pix_fmt bgr0 -video_size 1920x1080 -i \\.\pipe\mytestpipe -map 0 -c:v libx264 -r " + BitmapRate + " " + outPath);
  
                  //psi.RedirectStandardOutput = true;
  
                  process = Process.Start(psi);
  
                  process.EnableRaisingEvents = false;
  
                  p.WaitForConnection();
  
              }
  
              catch (Exception err)
  
              {
  
                  Logger.Write("Exception Error: " + err.ToString());
  
              }
  
          }

  I guess it is something with the arguments command, but I am not sure where the problem is.
  I tried to google and saw that you can use h264 or libx264 only with an mp4 output file ?

  How can I fix this ?

  When I am running the video file on any player I see everything moving very fast.

  This is a screenshot of the ffmpeg cmd window :

  

  And this is a link for the video file it created 1.37MB size and only 3 seconds length playing it with Media Player Classic :

  https://skydrive.live.com/redir?resid=EB1C71C44C3976D5 !295&authkey= !AJjCZ-zINYp7h4A

  https://skydrive.live.com/redir?resid=EB1C71C44C3976D5!295&authkey=!AJjCZ-zINYp7h4A

  The ffmpeg command from the cmd window :

  ffmpeg version N-53885-gf97e28e Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jun  7 2013 00:32:38 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 35.100 / 52. 35.100
  
    libavcodec     55. 15.100 / 55. 15.100
  
    libavformat    55.  8.102 / 55.  8.102
  
    libavdevice    55.  2.100 / 55.  2.100
  
    libavfilter     3. 75.101 /  3. 75.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100

  And this is when its working :

  ffmpeg version N-53885-gf97e28e Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jun  7 2013 00:32:38 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 35.100 / 52. 35.100
  
    libavcodec     55. 15.100 / 55. 15.100
  
    libavformat    55.  8.102 / 55.  8.102
  
    libavdevice    55.  2.100 / 55.  2.100
  
    libavfilter     3. 75.101 /  3. 75.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, rawvideo, from '\\.\pipe\mytestpipe':
  
    Duration: N/A, start: 0.000000, bitrate: 1658880 kb/s
  
      Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1920x1080, 1658880 k
  
  b/s, 25 tbr, 25 tbn, 25 tbc
  
  No pixel format specified, yuv444p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 003bc420] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  [libx264 @ 003bc420] profile High 4:4:4 Predictive, level 4.0, 4:4:4 8-bit
  
  Output #0, avi, to 'D:\okwow.avi':
  
    Metadata:
  
      ISFT            : Lavf55.8.102
  
      Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv444p, 1920x1080,
  
  q=-1--1, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> libx264)
  
  Press [q] to stop, [?] for help
  
  frame=   10 fps=1.9 q=0.0 size=       6kB time=00:00:00.00 bitrate=N/A

• How to convert fisheye-video into an equirectangular video to use with 360°-video viewers ?

  11 juin 2017, par P. Dee

  Actioncams like GoPro put a wider fov into a standard 1920 x 1080 or higher resolution at the expense of distortion.

  How do I use ffmpeg to convert this fov-encoded format into an equirectangular video to use with 360°-video viewers ?