Recherche avancée

Sur d’autres sites (8868)

• ffmpeg, how to add new audio (not mixing) in video

  15 février 2016, par Vetalll

  I used a command like :

  ffmpeg -i video.avi -i audio.mp3 -vcodec codec -acodec codec output_video.avi -newaudio

  in latest version for adding new audio track to video (not mix). But i updated the ffmpeg to newest version

  ffmpeg version git-2012-06-16-809d71d

  And now in this version the parameter "-newaudio" doesn’t work.

  Tell me please how i can add new audio to my video(not mix) using ffmpeg.

  p.s. sorry my English

• 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.

• ffmpeg video-concatenation - audio-/videotrack Synchronisation

  29 avril 2013, par user1739223

  I'm want to concatenate different video-files of random format. First I convert them to flv, adapt the framerate of each video to lowest of the involved videos. Next step is to decode them and remove the header (but not the header of the first video in the sequence, then I concatenate them with cat and finally I encode the resultsequence.

  But the video- and audio-track are going more and more out of sync from sequence-part to sequence-part.

  Would be glad for any idea.