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999,999
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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The Slip - Artworks
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Texte
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Demon seed (wav version)
26 septembre 2011, par
Mis à jour : Avril 2013
Langue : English
Type : Audio
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The four of us are dying (wav version)
26 septembre 2011, par
Mis à jour : Avril 2013
Langue : English
Type : Audio
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Corona radiata (wav version)
26 septembre 2011, par
Mis à jour : Avril 2013
Langue : English
Type : Audio
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Lights in the sky (wav version)
26 septembre 2011, par
Mis à jour : Avril 2013
Langue : English
Type : Audio
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Sur d’autres sites (11785)
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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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Revision 11e3ac62a5 : Fixing display size setting problem. Fix of https://code.google.com/p/webm/issu
23 août 2013, par Dmitry KovalevChanged Paths :
Modify /vp9/decoder/vp9_decodframe.c
Fixing display size setting problem.Fix of https://code.google.com/p/webm/issues/detail?id=608. We could have
used invalid display size equal to the previous frame size (not to the
current frame size).Change-Id : I91b576be5032e47084214052a1990dc51213e2f0
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Control noise and duration values while extracting silences of a video using FFMPEG
15 avril 2017, par Jitender KumarI have a requirement where I need to cut the video in chunk size of 10 mints. For that I need to detect silences first . I know the command, which is given below :
-i "C:\tmp\Test1.mp4" -af silencedetect=noise=-20dB:d=.2-f null -But I am really struggling to set the value of duration and noise in proportion that it can detect the silence near about 10 mints.
I need a help to set it out and also little bit of more information how both together work ?I have found link https://ffmpeg.org/ffmpeg-filters.html and under this section 6.60 silencedetect they have tried to explain about them. I see there that duration, we need to provide in seconds but I am completely fail to understand the purpose of noise.
Also I am executing this command on Window.
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