Silent channel detection

DvdKhl · 30th March 2009, 00:30

Hi,

Is there any way to detect silent audio channels (maybe with the use of AviSynth)?

I have some bogus video/audio files (avi, mkv, ogm, etc) which have mostly AC3 audio streams with 6 channels.
The problem ist they only have 2 channels which contain actual audio data,
the other channels are just silent.

I need a way to detect that.

Blue_MiSfit · 30th March 2009, 02:31

If you load the files into AviSynth, SoundOut is very handy. It has an analysis tool that will break down each channel and show you the levels.

Give it a whirl

~MiSfit

DvdKhl · 30th March 2009, 03:41

Looks promissing but I can't get it to work like I want it to:

I've installed AviSynth & AudioOut.

I create a script to get the 5. channel

DirectShowSource("{Multichannelfile}")
GetChannel(5)
SoundOut()

But an error message which tells me there isn't one.
I guess it is because DirectShow converts it to stereo before AviSynth gets hold of the audiostream.

Anyway to get all 6 channels?

30th March 2009, 00:30	#1 \| Link
DvdKhl Registered User Join Date: Dec 2002 Location: Germany Posts: 82	Silent channel detection Hi, Is there any way to detect silent audio channels (maybe with the use of AviSynth)? I have some bogus video/audio files (avi, mkv, ogm, etc) which have mostly AC3 audio streams with 6 channels. The problem ist they only have 2 channels which contain actual audio data, the other channels are just silent. I need a way to detect that.

30th March 2009, 02:31	#2 \| Link
Blue_MiSfit Derek Prestegard IRL Join Date: Nov 2003 Location: Los Angeles Posts: 5,989	If you load the files into AviSynth, SoundOut is very handy. It has an analysis tool that will break down each channel and show you the levels. Give it a whirl ~MiSfit __________________ These are all my personal statements, not those of my employer :)

30th March 2009, 03:41	#3 \| Link
DvdKhl Registered User Join Date: Dec 2002 Location: Germany Posts: 82	Looks promissing but I can't get it to work like I want it to: I've installed AviSynth & AudioOut. I create a script to get the 5. channel DirectShowSource("{Multichannelfile}") GetChannel(5) SoundOut() But an error message which tells me there isn't one. I guess it is because DirectShow converts it to stereo before AviSynth gets hold of the audiostream. Anyway to get all 6 channels?