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• PHP - How to get Shell errors echoed out to screen

  26 février 2013, par Ash

  I am in the process of using shell_exec() for the first time. I am trying to convert some video files on my server using the ffmpeg shell script.

  When I the below code in the browser, it returns NULL :

  var_dump(shell_exec("ffmpeg -i /var/www/html/sitedomain/httpdocs/tmp/ebev1177.mp4"));

  However when I run the equivalent code in my terminal :

  > ffmpeg -i /var/www/html/sitedomain/httpdocs/tmp/ebev1177.mp4

  I get back a whole load of useful information which ends in an error "At least one output file must be specified"

  Why is this info not being passed back to my PHP script so I can echo it out ?

• Splitting single 32-channel audio file into 32 mono audio files using ffmpeg

  16 janvier 2015, par user1066157

  I am trying to split a single 32-channel audio file in .caf format to 32 mono audio files in signed 16 bit little endian .wav format using ffmpeg, but I can’t figure out how to accomplish this exactly. I have tried to do :

  ffmpeg -i myAudio.caf -acodec pcm_s16le -map 0:0 channel_01.wav -map 0:1 channel_02.wav ...

  But this returns a "Stream map ’0:1’ matches no streams" error. Surely I am missing something entirely obvious here... Most likely I am confused about how to reference each individual channel in my single, multi-channel audio file. Could someone show me the right way of doing this perhaps ?

• Error while capturing video via RTSP from a network camera using OpenCV and FFMPEG

  29 octobre 2012, par Dídac Pérez

  I am using OpenCV and FFMPEG to capture frames from a network camera using RTSP. The point is that OpenCV successfully loads the FFMPEG .dll but icvCreateFileCapture_FFMPEG_p returns false in the following code of cap_ffmpeg.cpp :

  virtual bool open( const char* filename )
  
  {
  
      close();
  
  
  
      icvInitFFMPEG();
  
      if( !icvCreateFileCapture_FFMPEG_p )
  
          return false;
  
      ffmpegCapture = icvCreateFileCapture_FFMPEG_p( filename );
  
      return ffmpegCapture != 0;
  
  }