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• Running ffmpeg command through python script

  18 février 2015, par user2408159

  I am trying to execute ffmpeg commands in python.
  When the following command was executed from command line in windows cmd it worked :

  C:\FFmpeg\bin\ffmpeg -rtbufsize 100000k -r 65535/2733 -f dshow -i audio="virtual-audio-capturer":video="screen-capture-recorder" output100.avi

  However when I try to run the this command in python in this way :

  cmd='C:\FFmpeg\bin\ffmpeg -rtbufsize 100000k -r 65535/2733 -f dshow -i audio="virtual-audio-capturer":video="screen-capture-recorder" output100.avi'
  
  subprocess.call(cmd, shell=true)

  it doesn’t work

  I also tried this way

  cmd='C:\FFmpeg\bin\ffmpeg -rtbufsize 100000k -r 65535/2733 -f dshow -i audio="virtual-audio-capturer":video="screen-capture-recorder" output100.avi'
  
  subprocess.check_call(cmd) 

  But it didn’t work as well

  I would like to know what am I doing wrong.I using python 2.76.Thanks.

• Batch : Looping through folders and subfolders and get them into a script

  2 janvier 2017, par arielbeje

  I want to convert .flac files from X:\Music\flac\flacfolder\name.flac to X:\Music\mp3\flacfolder\name.mp3 using ffmpeg, but I couldn’t find how to loop through while passing the directory to a different command and manipulating it.

• Powershell script finishes after the first ffmpeg call

  25 mars 2014, par sk904861

  The following Powershell script only executes the first ffmpeg call, no matter which one is first. Both the ffmpeg and the powershell processes never finish. Stopping the server, however, leads to the processes finishing and suddenly the second picture also appears.

  Param($InputFile, $OutputFile, $Thumbnail, $Sprites)
  
  
  
  $ThumbnailWidth = 120
  
  $ThumbnailHeight = 120
  
  
  
  # Thumbnail
  
  ffmpeg -i $InputFile -f image2 -vframes 1 -filter:v "crop=min(iw\,ih):min(iw\,ih), scale=$($ThumbnailWidth):$($ThumbnailHeight)" -crf 18 "$($Thumbnail)\150x150.png"
  
  
  
  # Poster
  
  ffmpeg -i $InputFile -f image2 -vframes 1 -filter:v "crop=min(iw\,ih):min(iw\,ih), scale=$($PosterWidth):$($PosterHeight)" -crf 18 "$($Thumbnail)\1000x1000.png"

  The script gets called within an ASP.NET application as follows :

  ProcessStartInfo startInfo = new ProcessStartInfo();
  
  startInfo.FileName = "powershell.exe";
  
  startInfo.Arguments = String.Format("-executionpolicy RemoteSigned -file \"{0}\" \"{1}\" \"{2}\" \"{3}\" \"{4}\"", scriptPath, fullPath, videoPath, thumbnailPath, sprites);
  
  startInfo.RedirectStandardOutput = true;
  
  startInfo.RedirectStandardError = true;
  
  startInfo.UseShellExecute = false;
  
  startInfo.CreateNoWindow = true;
  
  Process process = new Process();
  
  process.StartInfo = startInfo;
  
  
  
  process.EnableRaisingEvents = true;
  
  process.Exited += delegate
  
  {
  
       // Do some cleaning up
  
  };
  
  
  
  process.Start();

  Does anyone have a clue, why only the first the two ffmpeg calls is working, while each call seems to be correct ?

  Adding process.StandardError.ReadToEnd(); makes the script finish as expected, but also makes it block, which is not acceptable.