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• android ffmpeg command lines

  10 avril 2014, par user3509984

  pls provide some tutorial to compile tat command in ffmpeg (sorry for my english) thanks in advance

  i am new android develop.i need to change video color like vintage ,sepia etc .i google many hours at last i found FFMPEG to achieve tat.i had command line for ffmpeg to convert video color ffmpeg -y -i /sdcard/videokit/in.mp4 -strict experimental -vf transpose=1 -s 160x120 -r 30 -aspect 4:3 -ab 48000 -ac 2 -ar 22050 -b 2097k /sdcard/videokit/out.mp4

  i need to know how to compile tat in android. pls provide some tutorial to achieve tat.

  i found one link tat command will work..but it give oly trai version... tat link is http://androidwarzone.blogspot.in/2011/12/ffmpeg4android.html

• FFMPEG and Mencoder building screenshot returns 0 size images

  12 avril 2014, par Genus

  I have a script and it used to work fine but suddenly it stopped working and giving me zero size images as screenshot after video convert.

  here is the command for video screenshot.

  $cmd = $GLOBALS["paths"]["ffmpeg"]." -y -i ".$file." -f mjpeg -r 1 -ss ".$time." -vframes 1 -an ".$tmpdir."/00000001.jpg 2>&1";
  
      exec($cmd,$results);

  Debug :

  -----------------------------------------------------
  
  
  
  ------------mencoder_and_fmpeg.php SCREENSHOT -------
  
  
  
  -----------------------------------------------------
  
  
  
    COMMAND: ffmpeg -y -i /home/TESTING/public_html/vid/6d/ad/29/6dad2946a2ba102.flv -f mjpeg -r 1 -ss 14.48 -vframes 1 -an /home/TESTING/public_html/scr/42/3a/92/00000001.jpg 2>&1
  
  
  
    FFmpeg version SVN-r16244, Copyright (c) 2000-2008 Fabrice Bellard, et al.
  
  
  
    configuration: --disable-mmx --enable-shared --enable-libvorbis --enable-gpl --enable-swscale --enable-pthreads --disable-static --disable-demuxer=v4l --disable-demuxer=v4l2 --enable-libtheora --enable-gpl --enable-libspeex --enable-libmp3lame --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libamr-nb --enable-libamr-wb --enable-nonfree --enable-libxvid
  
    libavutil     49.12. 0 / 49.12. 0
  
    libavcodec    52. 7. 0 / 52.108. 0
  
    libavformat   52.23. 1 / 52.92. 0
  
    libavdevice   52. 1. 0 / 52. 2. 3
  
    libswscale     0. 6. 1 /  0.12. 0
  
  
  
    built on Apr  9 2011 22:48:41, gcc: 4.1.2 20080704 (Red Hat 4.1.2-50)
  
    built by Admin-Ahead Server Technologies FFmpeg installer v5.0.6b
  
    Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 10.92 (131/12)
  
    Stream mapping:
  
    Stream #0.0 -> #0.0
  
  
  
    Press [q] to stop encoding
  
    ffmpeg: symbol lookup error: ffmpeg: undefined symbol: frame_hook_process

• System.Diagnostics.Process pipe (vertical bar) not accepted as argument

  15 avril 2014, par emp

  I'm trying to execute following code (source : http://geekswithblogs.net/PearlFactory/archive/2011/11/23/convert-mp3-to-aacflac-to-aac-or-any-other-combination.aspx) using System.Diagnostics.Process. It works fine in command line. But in C# it's failing on the | character.

  var myProcess = new Process();
  
          var p = new ProcessStartInfo();
  
          var sArgs = " -i emp.mp3 -f wav - | neroAacEnc -ignorelength -q 0.5 -if - -of emp.mp4";
  
          p.FileName = "ffmpeg.exe";
  
          p.CreateNoWindow = false;
  
          p.RedirectStandardOutput = false;
  
          p.UseShellExecute = false;
  
          p.Arguments = sArgs;
  
          myProcess.StartInfo = p;
  
          myProcess.Start();
  
          myProcess.WaitForExit();

  It gives the following error :

  Unable to find a suitable output format for '|' : Invalid argument

  I've looked around on stackoverflow and found the following hint but it is also not working :

  var psi = new ProcessStartInfo("ffmpeg.exe");
  
          psi.Arguments = "\"-i emp.mp3 -f wav -\" | \"neroAacEnc -ignorelength -q 0.5 -if - -of emp.mp4\"";
  
          psi.CreateNoWindow = false;
  
          psi.UseShellExecute = false;
  
          var process = new Process { StartInfo = psi };
  
          process.Start();
  
          process.WaitForExit();

  gives the following error :

  Unrecognized option 'i emp.mp3 -f wav -'
  Failed to set value '|' for option 'i emp.mp3 -f wav -'