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• FFMPEG with python : Only audio is playing when trying to replace the audio in video

  5 mai 2021, par Danny

  Hey guys I am a noob with ffmpeg and trying to replace the audio with a new audio, I have gone through some SO questions and still having trouble solving the problem. As of now, I am getting only the audio with the specified duration and only able to play it in vlc player. The video is not showing.

  


  Can someone tell me how to properly do it ?

  


  This is the command.

  


  process = subprocess.call([settings.VIDEO_ENCODING_FFMPEG_PATH, 
                "-probesize", "10M", "-i", input_file_path, "-i", input_audio_path, "-crf", "28",
                "-ss", 0, "-t", 50, "-vcodec", "libx264", "-b:v", "4M", "-preset", "medium",
                "-map", '0:v', "-map", "1:a", "-b:a", "64k", output_file_path])


  


  Thanks in advance.

  


• 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); 
  
  }

• How to prevent ffmpeg lib from printing in a command line when playing audio with a discord bot ?

  26 janvier 2021, par ICookieI

  I have a question about ffmpeg. I wrote a discord bot with discord.py lib, which plays audio when somebody joins a channel. I wanted the program to run on my computer in the background, so no console log will appear. Therefore I start the python script using a .bat and a .vbs file, so the process runs in the background. This works fine so far. The problem is that the ffmpeg lib (I assume it's the ffmpeg lib...) prints out a line ("[mp3 @ 0000020168869040] Estimating duration from bitrate, this may be inaccurate") in the command prompt when it plays audio, so everytime somebody joins a channel a command prompt appear on my desktop for 1 sec only to show this line, afterwards it closes, but it's really annoying that it shows up everytime. I was wondering if there is a way to prevent the ffmpeg lib to print out this line, but i couldnt find out how so far.
Can someone help me with that ?
Thanks Cookie

  


  my Code :

  


  def getAudioSource(source):

    audio_source = discord.FFmpegPCMAudio(executable="E:/PythonPrograms/DiscordBotHallo/Dateien/ffmpeg-win64-v4.2.2.exe", source=source)
    return audio_source


def getRandomGreeting():

    list = os.listdir("E:/PythonPrograms/DiscordBotHallo/Begrüßungen")
    Greeting = list[random.randrange(len(list))]
    Greeting = "Begrüßungen/" + Greeting
    return Greeting


@client.event
async def on_voice_state_update(member, before, after):

    if before.channel == None and member.id != 801800464756768768:
        greetingPath = getRandomGreeting()
        audio_source = getAudioSource(greetingPath)
        vc = await after.channel.connect()
        vc.play(audio_source)
        while vc.is_playing():
            await asyncio.sleep(1)
        vc.stop()
        await vc.disconnect()