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• How to salvage a gigantic, possibly corrupt, AIFF file ?

  12 février 2012, par Ross Duncan

  Due to a Sound Track Pro glitch, I have a problematic AIF file. It plays fine in QuickTime Player, and is about 1 hour 50 mins long. However :

  • It's 3.81GB in size, whereas (I believe) AIF files are only supposed to be 2GB or smaller.
  • iTunes refuses to play it.
  • Logic Pro gives the error message "party-mix.aif is empty!" when I try to import it.
  • VLC will open and play the file, but it ends after an 1 hour (I guess this is the 2GB point).

  • Attempting to transcode using ffmpeg to Ogg gives the errors,

    [aiff @ 0x102051000] max_analyze_duration 5000000 reached at 5001333

    ....

    [pcm_s16be @ 0x10205a200] invalid PCM packet

    but the resulting file plays in VLC up till 1 hour, when it ends.

  • Attempting to transcode using ffmpeg to MP3 gives similar results as Ogg, except that the number of channels must reduced from 6 to 2. This is odd because it was a stereo project - where the extra 4 channels came from I have no idea.
  • There are a few places where the audio has been very noticeably sped up.

  My question : how can I transcode this frankenstein monster to MP3 without losing the second half ? I am running Mac OS 10.6.8.

• FFMPEG never stops processing

  23 décembre 2011, par aamiri

  I have a perl script that issues a command to run ffmpeg. this is the ffmpeg command issued by the script :

  ffmpeg -y -i /path/to/video/input.mp4 -y -an -pass 1 -passlogfile x264-2pass-2763-log -threads 2 -vcodec libx264 -b 512k -flags +loop+mv4 -cmp 256 -partitions +parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 -me_method hex -subq 7 -trellis 1 -refs 5 -bf 3 -flags2 +bpyramid+wpred+mixed_refs+dct8x8 -coder 1 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -qmin 10 -qmax 51 -qdiff 4 -s 608x406 -analyzeduration 2000M -vf [in] pad=720:406:56:0:black [out] /path/to/output/video/output.mp4

  the file i am running it on, 'input.mp4' was an m4v that converted to mp4 by changing the extension to mp4. It plays as both mp4 and m4v. I noticed an issue in my script, where on m4v files it takes a long time to process. I thought converting it mp4 would help but it didn't. This ffmpeg command is to resize the video to fit in a custom made media player. I am currently running the script that issues that command, and it's stuck on the ffmpeg command. right now output.mp4 has exceded the filesize of input.mp4 and the file is still processing. This seems odd because for this particular video it should be shrinking the content. I fear that if i don't manually kill the ffmpeg command, output.mp4 is going to keep growing. What am i doing wrong here ?

• FFmpeg and types of samples

  23 juillet 2015, par Kyborg2011

  Decoded audio using FFmpeg (function avcodec_decode_audio3) and try to reproduce it through Audiotrack in Android. When playing I hear some growling. No music. On the forums advised that the problem with the samples. Question : how to solve this problem, if it is associated with a mismatch of types of samples ? Code decoding :

          while (av_read_frame(pFormatCtx, &packet)>= 0) {
  
              if (aCodecCtx->codec_type == AVMEDIA_TYPE_AUDIO) {
  
                          int data_size = AVCODEC_MAX_AUDIO_FRAME_SIZE * 2;
  
                          int size=packet.size;
  
   int decoded = 0;
  
                          while(size > 0) {
  
                                  int len = avcodec_decode_audio3(aCodecCtx, (uint16_t *) pAudioBuffer, &data_size, &packet);
  
  
  
  
  
                                  jbyte *bytes = (*env)->GetByteArrayElements(env, array, NULL);
  
                                  memcpy(bytes + decoded, (uint16_t *) pAudioBuffer, len);
  
                                  (*env)->ReleaseByteArrayElements(env, array, bytes, 0);
  
  
  
                                  (*env)->CallStaticVoidMethod(env, cls, mid, array);
  
  
  
  
  
                                  size -= len;
  
                                  decoded += len;
  
                                  }
  
              }
  
  
  
       }

  Java code :

      protected void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          setContentView(R.layout.main);
  
  
  
           int bufSize = AudioTrack.getMinBufferSize(44100,                                AudioFormat.CHANNEL_CONFIGURATION_MONO, 
  
                          AudioFormat.ENCODING_PCM_16BIT);
  
          track = new AudioTrack(AudioManager.STREAM_MUSIC, 44100, AudioFormat.CHANNEL_CONFIGURATION_MONO, 
  
                      AudioFormat.ENCODING_PCM_16BIT, bufSize, AudioTrack.MODE_STREAM);
  
          track.play();
  
  
  
              bytes = new byte[bufSize];
  
              int res = main(2, "/sdcard/muzika_iz_reklami_bmw_5_series_-_bmw_5_series.mp3", bytes);
  
  
  
  
  
              System.out.println(res);
  
      }
  
      private static void play(byte[] play) {
  
  
  
          track.write(play, 0, play.length);
  
      }

  How to solve this problem ?
  P.S. The file itself is checked - the standard player plays. Format : mp3.