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• ffprobe json output not working in exec, but works in CMD

  26 November 2015, by Nicholas Walker

  I’ve installed ffmpeg on my windows 2008 server.

  I use this string in CMD and i get what i want to get in my

  PHP file:

   ffprobe -v quiet -print_format json -show_format -show_streams "C:\wamp\www\uploads\fc30e528b500b26a391ed4f5ed484310.mp4" 

  This is my PHP function i found on another stackoverflow question, it had great feedback so i tested it.

  $file_name = 'fc30e528b500b26a391ed4f5ed484310';
  
  $file_ext = 'mp4';
  
  $ffprobe = 'C:\\ffmpeg\\bin\\ffprobe.exe';
  
  $videoFile = 'C:\\wamp\\www\\uploads\\'.$file_name.'.'.$file_ext;
  
  
  
  $cmd = shell_exec($ffprobe .' ffprobe -v quiet -print_format json -show_format -show_streams "'.$videoFile.'"');
  
  $parsed = json_decode($cmd, true);
  
  print_r($parsed);

  What is get back is nothing. I also tried using the same function i used with ffmpeg(which i got working for ffmpeg).

  $cmd = $ffprobe.' ffprobe -v quiet -print_format json -show_format -show_streams "'.$videoFile.'" 2>&1';
  
  echo shell_exec($cmd);

  This also brings back nothing.

  Any ideas?

• convert char buffer (with pcm audio data) to short buffer

  15 December 2012, by testCoder

  I have char pAudioBuffer buffer which i got from function ffmpeg:

  int len = avcodec_decode_audio3(av_codec_context,
  
              (int16_t *) pAudioBuffer, &out_size, &packet);

  I know that audio format is two bytes per sample, i need to convert every two bytes to short value, i have tried to use code snippet below, but i often got zero instead of short value:

  int shortBufIndex = 0;
  
  for (int i = 0; i < (out_size); i += 2) {
  
      char b1 = pAudioBuffer[i];
  
      char b2 = pAudioBuffer[i + 1];
  
      short sample = atoi(&b1) + atoi(&b2);
  
      shortBuffer[shortBufIndex] = sample;
  
      shortBufIndex++;
  
      LOGI("BUFFER_ITEM='%d'", sample);
  
  }

  What i'm doing wrong, how to convert every two bytes in char buffer to short and and back.

  UPDATE:

  system's byte order is LITTLE_ENDIAN i have test it like this: Endianness of Android NDK

  How can i convert every two bytes in buffer to sample of short type and back. Please can you provide any code sample.

• Catch "Unfortunately 'app' has stopped working" Error

  2 July 2015, by cadesalaberry

  I am using a very unstable library on Android that crashes sporadically. I start it using the startActivity() in my code.

  The unstable part of the code is doing a lot of video processing and uploading the result to a server. I do not really mind if the activity crashes, but I need to signal the server that it did.

  The crash comes from a memory leak (no time to solve it yet). Is there a way I can catch the error a display a more friendly/funny message instead?

  try {
  
      context.startActivity(intent);
  
  } catch (ApplicationCrashedException e) {
  
      server.notifyServerOfCrash();
  
      toast("I really disliked your face...");
  
  }

  Edit: Here is the Error:

  java.lang.OutOfMemoryError
  
    at dalvik.system.VMRuntime.newNonMovableArray(Native Method)
  
    at java.nio.MemoryBlock.allocate(MemoryBlock.java:125)
  
    at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:72)
  
    at io.cine.android.streaming.FFmpegMuxer.writeSampleData(FFmpegMuxer.java:151)
  
    at io.cine.android.streaming.AndroidEncoder.drainEncoder(AndroidEncoder.java:128)
  
    at io.cine.android.streaming.TextureMovieEncoder.handleFrameAvailable(TextureMovieEncoder.java:264)
  
    at io.cine.android.streaming.TextureMovieEncoder$EncoderHandler.handleMessage(TextureMovieEncoder.java:409)
  
    at android.os.Handler.dispatchMessage(Handler.java:102)
  
    at android.os.Looper.loop(Looper.java:136)
  
    at io.cine.android.streaming.TextureMovieEncoder.run(TextureMovieEncoder.java:219)
  
    at java.lang.Thread.run(Thread.java:841)

  For some reason once the BroadcastActivity runs out of memory, the Activity gets killed and comes back to the previous one. It then displays the ’app’ has stopped working Dialog. If I press OK, it kills the entire application and comes back to the home screen.

  Ideally I would just have it come back to the previous activity notifying the server silently. (Not killing the application)