audiomixer - reason not-negotiated (-4)

[Marianna Smidth Buschle]

I would suggest debuging with 'GST_DEBUG=*:3,GST_CAPS:5'
In order to try and figure out which CAPS are failing.

Also a good suggestion is to try and simplify the pipeline in order to 
try to pin point which elements are incompatible.

Fx:

gst-launch-1.0.exe -v udpsrc address=127.0.0.1 port=63000 !
application/x-rtp,media=audio,payload=8,clock-rate=8000,encoding-name=PCMA
! rtppcmadepay ! alawdec ! audiomixer ! fakesink

And then add elements one by one.

Might also have something to do with (de)interleaving?

Best Regards

Marianna

On 23.04.2022 09.55, gstreamer-devel-request at lists.freedesktop.org wrote:
> I like to use the following pipeline (receving incoming stream and convert
> it to webm) but I get error reason not-negotiated:
>
> gst-launch-1.0.exe -v udpsrc address=127.0.0.1 port=63000 !
> application/x-rtp,media=audio,payload=8,clock-rate=8000,encoding-name=PCMA
> ! rtppcmadepay ! alawdec ! audiomixer ! audioconvert ! opusenc ! webmmux !
> filesink location=ab.webm
> Setting pipeline to PAUSED ...
> Pipeline is live and does not need PREROLL ...
> Pipeline is PREROLLED ...
> Setting pipeline to PLAYING ...
> New clock: GstSystemClock
> /GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps =
> application/x-rtp, media=(string)audio, payload=(int)8,
> clock-rate=(int)8000, encoding-name=(string)PCMA
> ERROR: from element /GstPipeline:pipeline0/GstUDPSrc:udpsrc0: Internal data
> stream error.
> /GstPipeline:pipeline0/GstRtpPcmaDepay:rtppcmadepay0.GstPad:src: caps =
> audio/x-alaw, channels=(int)1, rate=(int)8000
> Additional debug info:
> ../libs/gst/base/gstbasesrc.c(3070): gst_base_src_loop ():
> /GstPipeline:pipeline0/GstUDPSrc:udpsrc0:
> streaming stopped, reason not-negotiated (-4)
> /GstPipeline:pipeline0/GstALawDec:alawdec0.GstPad:sink: caps =
> audio/x-alaw, channels=(int)1, rate=(int)8000
> Execution ended after 0:00:00.043469200
> Setting pipeline to NULL ...
> Freeing pipeline ...
>
> I know there is no sense to use audiomixer for one channel but this is the
> minimize version where I can still reproduce the error. In real there are
> two channel mixing on audiomixer.
> If I use the same pipeline without audiomixer then it works ok.
>
> Where is the problem with audiomixer or if I need to set some caps?
> I tried also with that and audioconvert and audioresample before audiomixer
> but without success.
>
> I am testing this with gstreamer 1.17.2 because I should use this version.
>
> BR, Bojan

-- 
Best regards / Med venlig hilsen
“Marianna Smidth Buschle”