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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 ?

• Why does x264 keep giving me "command not found" error on my Mac ? [closed]

  2 juillet 2021, par hd-dvd

  I just installed x264 via Homebrew on my Mac running MacOS 11.4 Big Sur. I'm trying to encode a video but I can't get x264 to run properly.

  


  This is the command I am running in the Terminal :

  


  x264 --bitrate 25000 --preset veryslow --bluray-compat --tune film --vbv-maxrate 40000 --vbv-bufsize 30000 --level 4.1 --keyint 30 --open-gop --slices 4 --fake-interlaced --colorprim "bt709" --transfer "bt709" --colormatrix "bt709" --sar 1:1 --pass 1 -o out.264 in.mp4

  


  and this is what it outputs :

  


  bash: x264 --bitrate 25000 --preset veryslow: command not found

  


  If I delete the --preset part then it just gets hung up on some other part, like --tune.

  


  I have tried brew doctor and there are no errors.

  


  If I just run x264 then it gives me x264 [error]: No input file. Run x264 --help for a list of options. so it seems as if x264 is installed. I don't know where to begin troubleshooting this but I'd like to get it to work.

  


  If I simplify the command way down to x264 -o out.264 in.mp4 then I get :

  


  avs [error]: failed to load avisynth
raw [error]: raw input requires a resolution.
x264 [error]: could not open input file `in.mp4' via any method!


  


  I would greatly appreciate some pointers on how to get this working.