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• avformat/segafilmenc : Remove redundant checks

  14 janvier 2020, par Andreas Rheinhardt

  avformat/segafilmenc : Remove redundant checks
  If an audio stream is present, the Sega FILM muxer checks for its
  
  compability with the container during init, so that the very same check
  
  needn't be repeated during writing the trailer.
  Essentially the same is true for the presence of a video stream : It has
  
  already been checked during init. Furthermore, after the check for the
  
  presence of a video stream succeeded, a pointer is set to point to the
  
  video stream. Yet said pointer (which was NULL before) will be
  
  derefenced anyway regardless of the result of the check. Coverity thus
  
  complained about this in CID 1434155 and removing this pointless check
  
  will also fix this issue.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/segafilmenc.c

• create thumbnail from video URL in C#

  23 mai 2016, par Hashem Aboonajmi

  I want to generate thumbnail from a video URL in C#. I have searched a lot to find a neat way but no success. I have used Nreco and MediaToolKit but none of them extract thumbnail image. using ffmpeg also has mumbo jumbos which didn’t worked !

  using NReco :

  var ffMpeg = new NReco.VideoConverter.FFMpegConverter();
  
  string thumbnailJPEGpath = "http://localhost:81882/content/hashem.jpeg";
  
  ffMpeg.GetVideoThumbnail(videoUrl,thumbnailJPEGpath);

  using ffmpeg :

  try
  
          {
  
              System.Diagnostics.Process ffmpeg;
  
  
  
              string video;
  
              string thumb;
  
  
  
              video = Server.MapPath("~/Content/Movies/bye.mp4");
  
              thumb = Server.MapPath("~/Content/frame.jpg");
  
  
  
              ffmpeg = new System.Diagnostics.Process();
  
  
  
              ffmpeg.StartInfo.Arguments = " -i " + video + " -ss 00:00:07 -vframes 1 -f image2 -vcodec mjpeg " + thumb;
  
              ffmpeg.StartInfo.FileName = Server.MapPath("~/Content/ffmpeg.exe");
  
              ffmpeg.Start();
  
              ffmpeg.WaitForExit();
  
              ffmpeg.Close();
  
          }
  
          catch (Exception ex)
  
          {
  
              Response.Write("Error: " + ex.Message);
  
          }

  to consider video files are not local and I have only a direct link to the file :
  e.g. :http://phytonord.com/Film-Series/hana/26.mp4

  does anyone has any solution ? any sample code that works ?

• Matching loudness of commentary track with FFmpeg

  9 mai 2017, par Jon Sangster

  I am using FFmpeg to mix a MP3 file containing a commentary track into the soundtrack of multimedia file. So far I have had great success using FFmpeg’s sidechaincompress filter to auto-duck the soundtrack stream before mixing in the commentary. You can hear the commentary clearly, even when there’s loud music or explosions going on in the film.

  Awesome.

  However, the issue I have now is during the very quiet scenes. When the soundtrack is very quiet, the commentary seems far too loud. If I adjust the volume of the entire commentary track so that it sounds right during the quiet scenes, it’s too heard to hear during the loud scenes.

  My current idea is to somehow use the sidechaincompress filter to duck the commentary track as well, before finally mixing it into the soundtrack. The problem though is that sidechaincompress compresses the target’s volume when the source is loud, but I need the volume to be compressed when the source is quiet.

  I have to admit that I am a quiet the newbie in this domain, so I may coming at this entirely wrong. I’m happy for any advice you can provide !