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#3 The Safest Place
16 octobre 2011, par
Mis à jour : Février 2013
Langue : English
Type : Audio
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#4 Emo Creates
15 octobre 2011, par
Mis à jour : Février 2013
Langue : English
Type : Audio
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#2 Typewriter Dance
15 octobre 2011, par
Mis à jour : Février 2013
Langue : English
Type : Audio
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#1 The Wires
11 octobre 2011, par
Mis à jour : Février 2013
Langue : English
Type : Audio
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ED-ME-5 1-DVD
11 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Audio
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Revolution of Open-source and film making towards open film making
6 octobre 2011, par
Mis à jour : Juillet 2013
Langue : English
Type : Texte
Autres articles (87)
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Sur d’autres sites (11684)
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tests/tiny_psnr : do not ignore errors from run_psnr
23 avril 2015, par Michael Niedermayer -
Problem with calculating and writing silence
3 mars 2023, par Bohdan PetrenkoBecause Discord sends no audio if user isn't talking, I need to calculate time after their latest voice data received and write some amout of silence to the buffer. I have this code for handling audio data :


private async Task OnVoiceReceived(VoiceNextConnection sender, VoiceReceiveEventArgs e)
{
 try
 {
 if (!_isRecording) return;
 
 if (e.User is null) return;

 if (!_circularBuffers.TryGetValue(e.User.Id, out var circularBuffer))
 {
 circularBuffer = new CircularBuffer(e.AudioFormat.SampleRate * e.AudioFormat.ChannelCount * 2 * _bufferDurationSeconds, 
 e.AudioFormat.ChannelCount);
 _circularBuffers[e.User.Id] = circularBuffer;
 }

 TimeSpan delay;

 if (!_lastVoiceActivity.TryGetValue(e.User.Id, out var lastData))
 {
 // If we don't have any data for this user, we assume that last data from this user was received at the same time as recording started
 delay = DateTimeOffset.Now - _recordingStartedAt;
 }
 else delay = DateTimeOffset.Now - lastData;

 // calculate how much silence we need to add to the buffer
 var silence = new byte[e.AudioFormat.SampleRate * e.AudioFormat.ChannelCount * 2 * (int)Math.Round(delay.TotalSeconds)];
 
 await circularBuffer.WriteAsync(silence);

 _lastVoiceActivity[e.User.Id] = DateTimeOffset.Now;
 
 
 await circularBuffer.WriteAsync(e.PcmData);
 }
 catch (Exception exception)
 {
 Log.Error(exception, "Error while receiving voice data");
 }
}


After the recording finishes, with ffmpeg I write buffers to .wav files and then mix audios.


I have a problem that sometimes amount of silence is wrong and espacially this can be heard after mixing audios of multiple users. Sometimes amount of silence is not enough and somtimes it's too long. For example, In conversation recording user 1 can respond to user 2 even before user 2 asks him or vice-versa, user 1 can respond too late. Also I found that the problem appears often after some data of the buffer was removed due to overfilling.


I tried to change formula to calculate silence, and add data duration when setting new value of
_lastVoiceActivitybut that just made the problem worse. Also I tried to add silence only if delay is more than 100ms but this also didn't help. For testing I use circular buffers which can contain 30 seconds of audio.

I use DSharpPlus for Discord and ffmpeg for mixing audios.


UPD : I found that if I don't remove data from buffers due to overfilling, the probles becomes almost invisible. So here is my CircularBuffer implementation :


public class CircularBuffer
{
 private readonly ConcurrentQueue<byte> _buffer;
 
 private readonly object _lockObject;
 private readonly int _bufferSize;

 public int Channels { get; private set; }

 public int Count
 {
 get
 {
 lock (_lockObject)
 {
 return _buffer.Count;
 }
 }
 }

 public CircularBuffer(int size, int channels)
 {
 _buffer = new ConcurrentQueue<byte>();
 _bufferSize = size;
 Channels = channels;
 _lockObject = new object();
 }

 public async Task WriteAsync(ReadOnlyMemory<byte> data)
 {
 lock (_lockObject)
 {
 if (data.Length > _bufferSize) data = data[^_bufferSize..];

 if (_buffer.Count + data.Length > _bufferSize)
 {
 var bytesToRemove = _buffer.Count + data.Length - _bufferSize;
 
 for (var i = 0; i < bytesToRemove; i++)
 {
 _buffer.TryDequeue(out _);
 }
 }
 
 for (var index = 0; index < data.Span.Length; index++)
 {
 var b = data.Span[index];
 _buffer.Enqueue(b);
 }
 }
 
 await Task.CompletedTask;
 }
 
 public async Task ReadAsync(Memory<byte> data)
 {
 lock (_lockObject)
 {
 if (data.Length > _buffer.Count)
 {
 data = data[.._buffer.Count];
 }
 
 for (var index = 0; index < data.Span.Length; index++)
 {
 _buffer.TryDequeue(out var b);
 data.Span[index] = b;
 }
 }

 await Task.CompletedTask;
 }

 public void Clear()
 {
 lock (_lockObject)
 {
 _buffer.Clear();
 }
 }
}
</byte></byte></byte></byte>

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avcodec/libtheora : fix setting keyframe_mask
7 février, par James Almeravcodec/libtheora : fix setting keyframe_mask
t_info.keyframe_granule_shift is set to the library default of 6, which is ok
for gop sizes up to 63. Since there's apparently no way to query the updated
value after having forced a gop value with TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE,
calculate it manually instead.Fixes ticket #11454.
Signed-off-by : James Almer <jamrial@gmail.com>
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