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• FFmpeg massive data loss when writing large data and swapping segments

  25 avril 2023, par Bohdan Petrenko

  I have an ffmpeg process running which continiously writes audio data to two 30 seconds (for testing, I'm actually planning to use 5 minutes) segments. The problem is that when I write some audio data with length more than size of two segments (60 seconds), 8-17 seconds of audio is lost. Here is how I run FFmpeg and write data :

  


      _ffmpeg = Process.Start(new ProcessStartInfo
    {
        FileName = "ffmpeg",
        Arguments = 
            $"-y -f s16le -ar 48000 -ac {Channels} -i pipe:0 -c:a libmp3lame -f segment -segment_time {BufferDuration} -segment_format mp3 -segment_wrap 2 -reset_timestamps 1 -segment_list \"{_segmentListPath}\" \"{segmentName}\"",
        UseShellExecute = false,
        RedirectStandardInput = true
    })!;
    // Channels is usually 1, BufferDuration is 30


  


  And here is how I write data :

  


  public async Task WriteSilenceAsync(int amount)
{
    if (amount > _size) amount = _size; // _size is 48000 * 1 * 2 * 30 * 2 = 5760000 (size of 1 minute of audio)
    
    var silence = _silenceBuffer.AsMemory(0, amount);
    await _ffmpeg.StandardInput.BaseStream.WriteAsync(silence);
}


  


  I tried to change the ffmpeg parameters and ways I write data. But I haven't found the solution.

  


  I'm sure that the problem is caused by ffmpeg segments, because if I disable segmenting and write audio to a single file, there are no problems with data loss or audio missmatch. I also sure that amount of silence to add in WriteSilenceAsync() method is calculated right. I'm not sure if the problem appears with data length more than 30 seconds but less then 1 minute, but I think it doesn't.

  


  I don't know how to solve this problem and would be glad to see any suggestions or solutions.

  


• Filename in android rejected by ffmpeg command

  28 avril 2020, par ark1974

  Planning to use ffmpeg in Android for A/V conversion. Installed Android Studio 3.5.3. I am fairly new to Android development and the folder names, unlike in windows system, is fairly confusing to me. I am able to build the gradle without any error but the fetched pathname is rejected by ffmpeg commandline.

  



  Questions :

  



  1) Resulting path_name shows both pathname and filename which is cool. Is the resulting path_name correct or expected ? However, ffmpeg raised error flag citing that directory/file do not exist corresponding to the resulting path_name.

  



  2) Inside android properties, the path starts with "Device storage/..." but Android Studio command starts with "/document/". Why I see this variation ?

  



  3) onActivityResult() do not work with @override private prefix but works with @override public, is it expected ? Many examples on internet, however use private though.

  



  4) MediaStore.Audio.Media.DATA code do not work at all, is it deprecated in Android 3.5.5 ?

  



  Java code :

  



  @Override public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(requestCode == 7 &&  resultCode == RESULT_OK){    
                    path_name = data.getData().getPath();    
        }
    }


  



  Result :

  



  path_name = "/document/primary:WhatsApp/Media/WhatsApp Audio/AUD-20200402-WA0006.mp3" **strong text**


  


• Ffmpeg "no directory found" when passing in a path to the mp3 file

  21 février 2020, par Eugene Levinson

  How my code should work :

  Join the voice channel with the user who sent the command

  Download the video using the link

  Save it as random 16 digit number .mp3

  Then pass the path to the FFmpeg player to play

  My code :

  The random 16 digit number

  def get_digits(amount):
  
      st = ""
  
      for i in range(amount):
  
          n = random.randint(0,9)
  
          st = st + str(n)
  
  
  
      return int(st)

  Downloading the file

  def get_path(url):
  
  
  
      #checking if the directory exists
  
      os.makedirs('Music', exist_ok=True)
  
  
  
      title = YouTube(url).streams.get_highest_resolution().title
  
      current_directory = pathlib.Path(__file__).parent.absolute()
  
  
  
      print(str(current_directory))
  
  
  
      #name for the music
  
      name = str(get_digits(16))
  
  
  
      YouTube(url).streams.filter(only_audio=True).order_by("bitrate").desc().first().download("Music",name )
  
      return str(str(current_directory) + "/Music/" + name + ".mp3")

  This gets called on command play

  #function to connect to a voice chat
  
  async def join_auth(ctx):
  
      try:
  
          channel = ctx.author.voice.channel
  
          vc = await channel.connect()
  
          return vc
  
      except Exception as e:
  
          logg("Exception occured when joining a voice channel: " + str(e),"error",str(ctx.guild.name), str(ctx.guild.id))

  The error I get :
  C:\Users\Eugene\Desktop\Discord bot/Music/4343941300524002.mp3: No such file or directory
  But the directory C:\Users\Eugene\Desktop\Discord bot\Music exists and it does contain the 4343941300524002.mp3 file. Does anyone know why do I get the error ?