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• Revision b0ef621f84 : Merge "Allow large tx_size in lossless coding with transform skipping" into next

  28 décembre 2014, par punksu

  Changed Paths :
   Modify /vp9/decoder/vp9_decodeframe.c

  
   Modify /vp9/decoder/vp9_decodemv.c

  
   Modify /vp9/encoder/vp9_bitstream.c

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Merge "Allow large tx_size in lossless coding with transform skipping" into
  nextgen

• Ffmpeg : Concat multiple videos and an audio file. Videos may or may not have audio and I cant know it before runnign the command

  28 juillet 2023, par AtActionPark

  I have a list of mp4 and an aac audio file. I have a concat.txt file with all the mp4s that need to be concatenated.
I need to concat all the mp4s and merge the aac on top.

  


  As said in the title, the mp4s individually may or may not have an audio track, and I can not check the mp4s with no audio, add a dummy sound track as it will be an automated process with thousands of commands executed daily.

  


  The sound of the mp4, if present, must be preserved and merged with the aac

  


  Here is a working command for the case where at least the first of my mp4s has an audiotrack :

  


  ffmpeg -f concat -safe 0 -i concat.txt -i audio.aac  -c:v copy -filter_complex "[0:a][1:a] amix=inputs=2:duration=shortest [audio_out]" -map 0:v -map "[audio_out]" -y result.mp4


  


  However that breaks if my mp4s dont have audio

  


  


  Stream specifier ':a' in filtergraph description [0:a][1:a]
amix=inputs=2:duration=shortest [audio_out] matches no streams.

  


  


  I've been reading about anullsrc, and would like to take [0:a] if it exists, or a generated empty audio channel, and merge it with my aac, but I'm not getting there.

  


  Any help would be appreciated

  


  Thanks

  


• How to stop ffmpeg process after it has finished processing in C# ?

  7 janvier 2018, par alan samuel

  I am trying to stop the ffmpeg process once it has finished doing what I want it do, but I am not able to find a way.

  Here is what I have done.

  //Process for running ffmpeg
  
  Process process = new Process();
  
  process.StartInfo.RedirectStandardOutput = true;
  
  process.StartInfo.RedirectStandardError = true;
  
  process.StartInfo.FileName = ffmpegfile;
  
  process.StartInfo.Arguments = commandtorun;
  
  process.StartInfo.UseShellExecute = false;
  
  process.StartInfo.CreateNoWindow = true;
  
  
  
  
  
  process.Start();
  
  process.WaitForExit();
  
  
  
  process.Close();

  The problem is ffmpeg does not tell the process to stop after it has finished executing, so I cant use WaitForExit() call.

  What i tried doing is

  commandtorun = commandtorun+ " && exit";

  to force ffmpeg to close after it finishes executing. Now this works when I try in cmd.

  But when I do the same thing in C#, ffmpeg closes down as soon as the command is executed.

  Is there any way to force ffmpeg or the process to close after the processing is done ?