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• ffmpeg.exe freezes

  31 octobre 2017, par Ayhan Dorman

  I’m using Asp.Net C# Framework 4 and currently developing a video conversion application. I’m also using ffmpeg to convert from all uploaded formats to flv. I’m first converting uploaded file to mpg and after to flv due to problems I encountered while trying conversion directly to flv from mp4 sometimes. But ffmpeg freezes as soon as it’s done with conversion process to mpg file. When I run task manager and check the processes list, it just stands there using no CPU resource. When I end the ffmpeg process directly from task manager, other process take place which converts from mpg to flv and preview file (jpg) and works smoothly. Due to freezing of first process, the second process cannot start when I try to upload from my web page’s file upload form. I appreciate any response from now. Here is my code :

          string duration = "00:00:00";
  
  
  
          //converting video
  
          Process ffmpeg;
  
          ffmpeg = new Process();
  
  
  
          // convert to mpg 1st
  
          ffmpeg.StartInfo.Arguments = " -i \"" + Server.MapPath("static/user/vid/") + videolink + "\" -f mpeg -b 300k -ac 2 -ab 128k -ar 44K \"" + Server.MapPath("static/user/vid/") + mpglink + "\"";
  
          ffmpeg.StartInfo.FileName = Page.MapPath("bin/ffmpeg.exe");
  
          ffmpeg.StartInfo.CreateNoWindow = true;
  
          ffmpeg.StartInfo.UseShellExecute = false;
  
          ffmpeg.StartInfo.RedirectStandardOutput = true;
  
          ffmpeg.StartInfo.RedirectStandardError = true;
  
          ffmpeg.Start();
  
  
  
          ffmpeg.WaitForExit();
  
          ffmpeg.Close();
  
  
  
  
  
          // mpg 2 flv
  
          ffmpeg = new Process();
  
          ffmpeg.StartInfo.Arguments = " -i \"" + Server.MapPath("static/user/vid/") + mpglink + "\" -f flv -s 624x352 \"" + Server.MapPath("static/user/vid/") + flvlink + "\"";
  
          ffmpeg.StartInfo.FileName = Page.MapPath("bin/ffmpeg.exe");
  
          ffmpeg.StartInfo.CreateNoWindow = true;
  
          ffmpeg.StartInfo.UseShellExecute = false;
  
          ffmpeg.StartInfo.RedirectStandardOutput = true;
  
          ffmpeg.StartInfo.RedirectStandardError = true;
  
          ffmpeg.Start();
  
  
  
          ffmpeg.BeginOutputReadLine();
  
          string error = ffmpeg.StandardError.ReadToEnd();
  
          ffmpeg.WaitForExit();
  
  
  
          try
  
          {
  
              duration = error.Substring(error.IndexOf("Duration: ") + 10, 8);
  
          }
  
          catch
  
          {
  
          }
  
  
  
          if (ffmpeg.ExitCode != 0)
  
          {
  
              ltrUpload.Text = "<div class="\&quot;resultbox-negative\&quot;">Problem occured during upload process. Error code: " + error + "<br />" + "</div>";
  
              return;
  
          }
  
          ffmpeg.Close();
  
  
  
  
  
          // generate preview image
  
          ffmpeg.StartInfo.Arguments = " -i \"" + Server.MapPath("static/user/vid/") + flvlink + "\" -s 624x352 -ss 00:00:03 -an -vframes 1 -f image2 -vcodec mjpeg \"" + Server.MapPath("static/user/vid/") + flvlink.Replace(".flv", ".jpg") + "\"";
  
          ffmpeg.StartInfo.FileName = Page.MapPath("bin/ffmpeg.exe");
  
          ffmpeg.StartInfo.CreateNoWindow = true;
  
          ffmpeg.StartInfo.UseShellExecute = false;
  
          ffmpeg.StartInfo.RedirectStandardOutput = true;
  
          ffmpeg.StartInfo.RedirectStandardError = true;
  
          ffmpeg.Start();
  
          ffmpeg.WaitForExit();
  
          ffmpeg.Close();
  
  
  
          // deleting original file and mpg
  
          FileInfo fi = new FileInfo(Server.MapPath("static/user/vid/") + videolink);
  
          if (fi.Exists) fi.Delete();
  
          fi = new FileInfo(Server.MapPath("static/user/vid/") + mpglink);
  
          if (fi.Exists) fi.Delete();

• How to import and use FFmpegInteropX.FFmpegUWP ?

  14 janvier, par Boris

  I am writing a WinUI3 app. I need it to play a .mkv video file using MediaPlayerElement control. Out of box, .mkv file types are not supported. So I came upon a package FFmpegInteropX.FFmpegUWP (current v5.1.100) and installed it to the solution via Visual Studio NuGet Package Manager. The installation went fine and the package is definitely part of the project :

  


  <packagereference include="FFmpegInteropX.FFmpegUWP" version="5.1.100"></packagereference>

  


  The problem I have is that when I type using FFmpegInteropX; it is not recognized and I cannot use it. I've noticed there is also a FFmpegInteropX package (so without the ".FFmpegUWP" part) and I tried installing that one too, as I was trying to make the using statement work. However, it appears that that package is not intended for WinUI3 projects and NuGet removed it.

  


  Now, I am clueless on how to use the FFmpegInteropX.FFmpegUWP in the project. Could anyone please explain why I might be experiencing this problem ?

  


• libvpx 0.9.1 and FFmpeg 0.6

  18 juin 2010, par Multimedia Mike — VP8

  Great news : Hot on the heels of FFmpeg’s 0.6 release, the WebM project released version 0.9.1 of their libvpx. I can finally obsolete my last set of instructions on getting FFmpeg-svn working with libvpx 0.9.

  Building libvpx 0.9.1
  Do this to build libvpx 0.9.1 on Unix-like systems :

  • Download libvpx 0.9.1 from http://code.google.com/p/webm/downloads/list
  • Unpack, chdir to the source dir, ’./configure && make && make install’

  libvpx’s build system has been firmed up a bit since version 0.9. It’s now smart enough to install when said target is invoked and it also builds the assembly language optimizations. Be advised that on 32- and 64-bit x86 machines, Yasm must be present (install either from source or through your package manager).

  Building FFmpeg 0.6
  To build the newly-released FFmpeg 0.6 :

  • Install Vorbis through your package manager if you care to encode WebM files with audio ; e.g., ’libvorbis-dev’ is the package you want on Ubuntu
  • Download FFmpeg 0.6 from the project’s download page
  • Configure FFmpeg with at least these options : ./configure --enable-libvpx --enable-libvorbis --enable-pthreads ; the final link step still seems to fail on Linux if the pthreads option is disabled
  • ’make’

  Verifying
  Check this out :

  $ ./ffmpeg -formats 2> /dev/null | grep WebM
    E webm            WebM file format
  $ ./ffmpeg -codecs 2> /dev/null | grep libvpx
  
   DEV    libvpx          libvpx VP8
  

  That means that this FFmpeg binary can mux a WebM file and can both decode and encode VP8 video via libvpx. If you’re wondering why the WebM format does not list a ’D’ indicating the ability to demux a WebM file, that’s because demuxing WebM is handled by the general Matroska demuxer.

  Doing Work
  Encode a WebM file :

  ffmpeg -i <input_file> <output_file.webm>

  FFmpeg just does the right thing when it seems that .webm extension on the output file. It’s almost magical.

  For instant gratification that the encoded file is valid, you can view it immediately using ’ffplay’, if that binary was built (done by default if the right support libraries are present). If ffplay is not present, you can always execute this command line to see some decode operation :

  ffmpeg -i <output_file.webm> -f framecrc -