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• C# The specified executable is not a valid application for this OS platform

  22 avril 2015, par Mihai Ciully

  I’m making a Video sharing application(the likes of youtube) for my bachelor degree(the project is done in asp.net web forms)
  And i want to convert any video the user uploads to mp4.For this i’m using the Nreco ffmpeg wrapper for asp.

  I’m doing all this locally and this project is not going live.

  The video conversion is done in a separate thread.

  protected void Upload_Click(object sender, EventArgs e)
  
  {
  
  //File Uploads to Server
  
  Thread t1 = new Thread(
  
  unused => compressVideo(Video_Path, Final_Path,User_id)
  
  );
  
  t1.Start();
  
  }
  
  
  
  public static void compressVideo(string Video_Path, string Final_Path,string UID)
  
  {
  
      var ffMpeg = new NReco.VideoConverter.FFMpegConverter();
  
      ffMpeg2.ConvertProgress += (o, args) =>
  
          {
  
              //SignalR calls.Doing this to update the ui
  
          };
  
  
  
      ffMpeg.ConvertMedia(Video_Path, Final_Path, NReco.VideoConverter.Format.mp4);
  
  }

  First time i did this it all worked fine,not a single problem.
  Two weeks late,after not modifying this page,i try it again and the application throws this exception :

  An unhandled exception of type ’System.ComponentModel.Win32Exception’
  occurred in NReco.VideoConverter.dll

  Additional information : The specified executable is not a valid
  application for this OS platform.

  on the line :

  ffMpeg.ConvertMedia(Video_Path, Final_Path, NReco.VideoConverter.Format.mp4);

  If i call the ffMpeg.ConvertMedia(),the exception is not thrown and the code works as expected.So im guessing it has something to do with threads.But that’s not all.
  After messing around with the code trying to solve this and not succeeding i revert back to the original code.In a last attempt i try it again(with the original code) and the application gave the build error.

  attempted to access an unloaded appdomain.

  Any modification i did to the code was ignored and i was always getting that error when compiling.
  After taking a five minutes break to calm down, i try it again.It magically fixed its self.The build error was gone and even the conversion was working.

  But the dream didn’t last long.After a few minutes the conversion thread started throwing the same exception again.
  I was not able to replicate the same result.

  My experience and knowledge with asp.net web forms and web design in general are fairly low,so please keep the answers as simple as possible.

• avutil/common : add av_rint64_clip

  1er novembre 2015, par Ganesh Ajjanagadde

  avutil/common : add av_rint64_clip
  The rationale for this function is reflected in the documentation for
  
  it, and is copied here :
  Clip a double value into the long long amin-amax range.
  
  This function is needed because conversion of floating point to integers when
  
  it does not fit in the integer’s representation does not necessarily saturate
  
  correctly (usually converted to a cvttsd2si on x86) which saturates numbers
  
  > INT64_MAX to INT64_MIN. The standard marks such conversions as undefined
  
  behavior, allowing this sort of mathematically bogus conversions. This provides
  
  a safe alternative that is slower obviously but assures safety and better
  
  mathematical behavior.
  
  API :
  
  @param a value to clip
  
  @param amin minimum value of the clip range
  
  @param amax maximum value of the clip range
  
  @return clipped value
  Note that a priori if one can guarantee from the calling side that the
  
  double is in range, it is safe to simply do an explicit/implicit cast,
  
  and that will be far faster. However, otherwise this function should be
  
  used.
  avutil minor version is bumped.
  Reviewed-by : Ronald S. Bultje <rsbultje@gmail.com>
  
  Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
  

  • [DH] libavutil/common.h
  • [DH] libavutil/version.h

• lavfi : make request_frame() non-recursive.

  30 septembre 2015, par Nicolas George

  lavfi : make request_frame() non-recursive.
  Instead of calling the input filter request_frame() method,
  
  ff_request_frame() now marks the link and returns immediately.
  
  buffersink is changed to activate the marked filters until
  
  a frame is obtained.
  

  • [DH] libavfilter/avfilter.c
  • [DH] libavfilter/avfilter.h
  • [DH] libavfilter/avfiltergraph.c
  • [DH] libavfilter/buffersink.c
  • [DH] libavfilter/internal.h