Multi wav channel with separate volume control.

[Ing.Marinangeli]

I tried this command line but nothing happens.....

gst-launch filesrc location="/media/sdb1/ALL_night_Long.wav" ! wavparse 
!  audioconvert ! deinterleave name=d  d.src0 ! adder name=a ! alsasink \
 > d.src1 ! queue ! audioconvert ! a.
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...

aught interrupt -- handling interrupt.
Interrupt: Stopping pipeline ...
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...


Can someone explain me why playback does not start?

Giorgio.









Il 29/05/2014 12:51, Ing.Marinangeli ha scritto:
> Hi everybody,
> I have a multi channel wav file ( 4 mono channel ) and need to 
> separate each channel, change the volume for each channel and send all 
> to alsa sink device.
>
> At the first, I tried to realize a gst-launch command line to build 
> that pipeline but without any good result.
>
> At the moment I am able only to select one channel to play with this 
> command line:
> gst-launch filesrc location="/media/sdb1/ALL_night_Long.wav" ! 
> wavparse ! deinterleave name=d d.src3 ! adder name=add !  alsasink
>
>
> May be, the right way to realize my goal,
> is to use deinterleave element to split the original stream to single 
> channel audio stream.
> Use 4 volume element to control the level for each single audio stream 
> and use an adder element to mix all stream before to send them to 
> alsasink.
> Is this correct?
>
> Someone could suggest me a example pipeline?
>
> I can't understand how I can connect single deinterleave source pad ( 
> d.src3 in my example) to Adder sink pad ( add.sink0 for example).
>
> Thanks,
> Giorgio.
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