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• Ffmpeg hangs when -vcodec copy specified (called from Java via ProcessBuilder)

  24 juin 2015, par Inglonias

  I’m trying to use ffmpeg to export an array of bytes to a video file, but the people I work with insist that I use -vcodec copy in the arguments for it. This, however, causes the code to hang, whereas if I don’t use -vcodec copy, the code will not hang. I don’t know what the problem is, and I’ve been trying to debug this code for the past two hours.

  Here is the relevant section of code. I’ve added comments above and below the line where the code hangs. Can anybody help me ?

          // This is the tricky part. We need to build an ffmpeg process that
  
          // takes input from stdin, and then plug Java into that.
  
          ProcessBuilder ffmpegBuilder = new ProcessBuilder();
  
          String[] cmd = {"ffmpeg", "-i", "-","-vcodec", "copy", directory
  
                  + "/" + fileName};
  
          StringBuilder combinedCmd = new StringBuilder();
  
          for (String s : cmd) {
  
              combinedCmd.append(s);
  
              combinedCmd.append(" ");
  
          }
  
          mLogger.log(Level.INFO,"Final command is " + combinedCmd.toString());
  
          ffmpegBuilder.command(cmd);
  
          ffmpegBuilder.redirectErrorStream(true); // So that stdout and stderr go
  
                                                      // to the same stream.
  
          byte[] dataToWrite = new byte[data.size()];
  
          for (int i = 0; i < dataToWrite.length; i++) {
  
              dataToWrite[i] = data.get(i); // Is there really STILL no better way
  
                                              // to convert an ArrayList to an
  
                                              // array?!
  
          }
  
          try {
  
              Process ffmpeg = ffmpegBuilder.start();
  
              OutputStream stdin = ffmpeg.getOutputStream();
  
              BufferedReader stdout = new BufferedReader(new InputStreamReader(
  
                      ffmpeg.getInputStream()));
  
  //HANGS AT THIS LINE vvvvvvvvvvvvvvvv
  
              stdin.write(dataToWrite);
  
  //HANGS AT THIS LINE ^^^^^^^^^^^^^^^^
  
  
  
              String line = "I know a song that gets on everybody's nerves...";
  
              while ((line != null) && stdout.ready()) {
  
                  line = stdout.readLine();
  
                  mLogger.log(Level.INFO, line);
  
              }
  
              try {
  
                  ffmpeg.waitFor(2, TimeUnit.SECONDS);
  
                  ffmpeg.destroyForcibly();
  
              } catch (InterruptedException e) {
  
                  // TODO Auto-generated catch block
  
                  e.printStackTrace();
  
              }
  
          } catch (IOException e) {
  
              // TODO Auto-generated catch block
  
              e.printStackTrace();
  
          }

• Audio playing back at the wrong speed using FFmpeg on Android

  11 avril 2019, par Kyborg2011

  General problem in the following :
  I decode the audio as follows :

  ReSampleContext* rsc = av_audio_resample_init(
  
          1, aCodecCtx->channels,
  
          aCodecCtx->sample_rate, aCodecCtx->sample_rate,
  
          av_get_sample_fmt("u8"), aCodecCtx->sample_fmt,
  
          16, 10, 0, 1);
  
  
  
  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, pAudioBuffer, 
  
                   &data_size, &packet);
  
  
  
               //Сonvert audio to sample 8bit
  
               out_size = audio_resample(rsc, outBuffer, pAudioBuffer, len);
  
  
  
               jbyte *bytes = (*env)->GetByteArrayElements(env, array, NULL);
  
  
  
               memcpy(bytes, outBuffer, out_size);
  
               (*env)->ReleaseByteArrayElements(env, array, bytes, 0);
  
               (*env)->CallStaticVoidMethod(env, cls, mid, array, out_size, number);
  
  
  
               size -= len;
  
               number++;
  
           }
  
       }
  
   }

  Next release it AudioTrack. After that, I hear that song that was necessary, but with noise and speed of 2 times larger. In what may be the problem ?

  UPDATE :
  This is Java code :

  public static AudioTrack track;
  
  public static byte[] bytes;
  
  protected void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.main);
  
      int bufSize = 2048;
  
      track = new AudioTrack(AudioManager.STREAM_MUSIC, 44100, AudioFormat.CHANNEL_OUT_MONO, 
  
                  AudioFormat.ENCODING_PCM_8BIT, bufSize, AudioTrack.MODE_STREAM); 
  
  
  
      bytes = new byte[bufSize];
  
      Thread mAudioThread = new Thread(new Runnable() {
  
          public void run() {
  
              int res = main(2, "/sdcard/muzika_iz_reklami_bmw_5_series_-_bmw_5_series.mp3", bytes);
  
              System.out.println(res);
  
          } 
  
      });
  
      mAudioThread.setPriority(Thread.MAX_PRIORITY);
  
      mAudioThread.start(); 
  
  }
  
  
  
  private static void play(byte[] play, int length, int p) {
  
      if (p==0){
  
          track.play();
  
      }
  
      track.write(play, 0, length); 
  
  }

• Automatic encoder selection failed Default encoder for format mp3 is probably disabled. Please choose an encoder manually.Error selecting an encoder

  27 janvier 2018, par Parimal Desai

  using ffmpeg compressing song to low quality getting error for

  "Automatic encoder selection failed for output stream #0:1. Default encoder for format mp3 (codec mp3) is probably disabled. Please choose an encoder manually. Error selecting an encoder for stream 0:1"

  ffmpeg -i /home/smubu/public_html/uploads/tracks/47865540_1999341734_1027911481.mp3 -ab 64 /home/smubu/public_html/uploads/tracks/47865540_1999341734_1027911481_comp_96.mp3
  
  
  
  ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-18)
  
    configuration:
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
  [mp3 @ 0x218e380] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, mp3, from '/home/smubu/public_html/uploads/tracks/47865540_1999341734_1027911481.mp3':
  
    Metadata:
  
      encoder         : LAME 32bits version 3.98.2 (http://www.mp3dev.org/)
  
      title           : Dj.Senior'B Kantinti [Club Rmx
  
      track           : 2010
  
      comment         : Downloaded from Howwe Entertainment [ www.howwe.biz ]
  
      TEXT            : 2010
  
      TLEN            : 97391548
  
      artist          : Stecia Mayanja
  
      album_artist    : www.howwe.biz
  
      composer        : www.howwe.biz
  
      album           : Howwe Entertainment
  
      genre           : www.howwe.biz
  
      date            : 2010
  
    Duration: 00:03:46.34, start: 0.000000, bitrate: 81 kb/s
  
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 80 kb/s
  
      Stream #0:1: Video: png, rgba(pc), 600x600, 90k tbr, 90k tbn, 90k tbc
  
      Metadata:
  
        comment         : Other
  
  Automatic encoder selection failed for output stream #0:1. Default encoder for format mp3 (codec mp3) is probably disabled. Please choose an encoder manually.
  
  Error selecting an encoder for stream 0:1

  Help me regarding this issue