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• 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.

• Anomalie #2788 : Critères optionnels et passage automatique de #ENV dans les modèles

  8 juillet 2012, par jluc -

  La question est donc "comment faire un critère conditionnel qui ne prenne que les arguments passés explicitement en paramètre lors de l’appel du modèle". Vu que ceux ci sont les seuls à pouvoir être récupérés également par #ENVarg/nomdelargument, la question est "comment boucler sur l’environnement (...)

• Installing faad library for ffmpeg through Homebrew on mac OS X Lion

  14 décembre 2011, par alex

  Following up with my previous question, I decided to give Ffmpeg a try and installed it on my Mac with Homebrew.

  I am now trying to follow this tutorial and use the linked script. But can't make/install the script. I first corrected a small bug (replaced CODEC_TYPE_AUDIO, CODEC_TYPE_VIDEO and PKT_FLAG_KEY with AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_VIDEO, and AV_PKT_FLAG_KEY respectively in live_segmenter.c). But now, when I run make in the unzipped folder, I get the following warning and error messages :

  gcc -Wall -g live_segmenter.c -o live_segmenter -lavformat -lavcodec -lavutil -lbz2 -lm -lz -lfaac -lmp3lame -lx264 -lfaad -lpthread
  
  live_segmenter.c: In function ‘main’:
  
  live_segmenter.c:149: warning: ‘av_open_input_file’ is deprecated (declared at /usr/local/include/libavformat/avformat.h:1093)
  
  live_segmenter.c:165: warning: implicit declaration of function ‘guess_format’
  
  live_segmenter.c:165: warning: initialization makes pointer from integer without a cast
  
  live_segmenter.c:208: warning: ‘av_set_parameters’ is deprecated (declared at /usr/local/include/libavformat/avformat.h:1407)
  
  live_segmenter.c:214: warning: ‘dump_format’ is deprecated (declared at /usr/local/include/libavformat/avformat.h:1535)
  
  live_segmenter.c:232: warning: ‘url_fopen’ is deprecated (declared at /usr/local/include/libavformat/avio.h:279)
  
  live_segmenter.c:238: warning: ‘av_write_header’ is deprecated (declared at /usr/local/include/libavformat/avformat.h:1465)
  
  live_segmenter.c:283: warning: ‘put_flush_packet’ is deprecated (declared at /usr/local/include/libavformat/avio.h:293)
  
  live_segmenter.c:284: warning: ‘url_fclose’ is deprecated (declared at /usr/local/include/libavformat/avio.h:280)
  
  live_segmenter.c:289: warning: ‘url_fopen’ is deprecated (declared at /usr/local/include/libavformat/avio.h:279)
  
  live_segmenter.c:326: warning: ‘url_fclose’ is deprecated (declared at /usr/local/include/libavformat/avio.h:280)
  
  ld: library not found for -lfaad
  
  collect2: ld returned 1 exit status
  
  make: *** [all] Error 1

  I also downloaded the faac/faad libraries from here. When I run make in faac, it says I have nothing to install, but I can't find out how to install faad...

  Would love any help you can offer !