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Interleave isolation problem

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Interleave isolation problem

William Salibrici

I am using the following simple pipeline to interleave two audio test sources. My development machine is windows 7 and I’m using GStreamer 1.10.4 with your windows pre-built binaries.

 

gst-launch-1.0 -e --gst-debug=*:3

 

interleave name=i ! directsoundsink

 

audiotestsrc wave=0 freq=200 !

 

"audio/x-raw,format=S16LE,rate=8000,channels=1,channel-mask=(bitmask)0x1" !

 

queue ! i.sink_0

 

audiotestsrc wave=8 freq=1000 !

 

"audio/x-raw,format=S16LE,rate=8000,channels=1,channel-mask=(bitmask)0x2" !

 

queue ! i.sink_1

 

The pipeline runs without errors. I used headphones to listen to the output. One side plays just the wave=0 signal which is correct. However, the other side plays the wave=8 signal mixed with an attenuated version of the wave=0 signal. Not good. Perhaps I am missing something. Can anyone help resolve this problem?

Thanks so much for your help,

Bill  

 


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Re: Interleave isolation problem

Antonio Ospite-2
On Fri, 28 Apr 2017 18:25:16 +0000
William Salibrici <[hidden email]> wrote:

> I am using the following simple pipeline to interleave two audio test
> sources. My development machine is windows 7 and I'm using GStreamer
> 1.10.4 with your windows pre-built binaries.
>
> gst-launch-1.0 -e --gst-debug=*:3
>   interleave name=i ! directsoundsink
>   audiotestsrc wave=0 freq=200 !
>     "audio/x-raw,format=S16LE,rate=8000,channels=1,channel-mask=(bitmask)0x1" !
>      queue ! i.sink_0
>   audiotestsrc wave=8 freq=1000 !
>     "audio/x-raw,format=S16LE,rate=8000,channels=1,channel-mask=(bitmask)0x2" !
>     queue ! i.sink_1
>
> The pipeline runs without errors. I used headphones to listen to the
> output. One side plays just the wave=0 signal which is correct.
> However, the other side plays the wave=8 signal mixed with an
> attenuated version of the wave=0 signal. Not good.
>

If you replace directsoundsink with "wavenc ! filesink
location=output.wav" and open the file in an audio editor (e.g.
Audacity) you can check if there is something wrong with interleave.

I tried your pipeline with 1.10.4 on linux and the produced audio
data seems to be OK here, so I don't think interleave is the problem.

It could be directsoundsink (try using the mixer to mute the right and
left channel maybe), or the problem could even be in the analog part of
the system.

When saying PEBCAC (Problem Exists Between Chair And Computer)
sometimes it is the user but sometimes it's just the cables. :)

Let us know if you figure out what is actually causing the issue.

Ciao,
   Antonio

--
Antonio Ospite
https://ao2.it
https://twitter.com/ao2it

A: Because it messes up the order in which people normally read text.
   See http://en.wikipedia.org/wiki/Posting_style
Q: Why is top-posting such a bad thing?
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