API question: How to get current volume level (detect silence in video)?

[AqlaSolutions]

I wish to control video playback speed depending on if there is a voice or silence in video. Is it possible to detect silent moments with vlcdotnet?

[mfkl]

I don't think so.

You could use the SetAudioCallbacks from LVS, and do some processing on the raw buffers to find that out though it doesn't seem ideal.

[jeremyVignelles]

I'm replying here for Vlc.DotNet, but that's true for all libvlc bindings.

The only way I can think of is highly theoretical : Using audio callbacks to get the raw audio data and analyze that to see if it there is audio. If you're doing that "on-the-fly", I'm not sure how you could sync it with the video afterwards.

Another way in libvlc would be to create an audio filter plugin (probably in C or C++) that detects silence/audio, but that's quite hard to do.

Otherwise, look into ffmpeg or NAudio to see if something is doable there.

[AqlaSolutions]

Are there any examples on using SetAudioCallbacks to analyze raw audio data?

[mfkl]

https://code.videolan.org/mfkl/libvlcsharp-samples/tree/master/AudioCallbacks

[AqlaSolutions]

But I don't see a way to access SetAudioCallbacks from VLC DotNet

[mfkl]

that's why I mentioned libvlcsharp.

[AqlaSolutions]

It seems that NAudio with this code perfectly fit my intentions. Syncing timestamps with VLC is very doable.