mix two audio streams

[Farzan Shojaee]

Hi
Yea, I have enabled the verbose mode and the negotiated caps seems to be ok, but nothing heard, these are the negotiated caps :

Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
/GstPipeline:pipeline0/GstUDPSrc:udpsrc0.GstPad:src: caps = "application/x-rtp\,\ media\=\(string\)audio\,\ payload\=\(int\)0\,\ clock-rate\=\(int\)8000"
/GstPipeline:pipeline0/GstQueue:queue0.GstPad:sink: caps = "application/x-rtp\,\ media\=\(string\)audio\,\ payload\=\(int\)0\,\ clock-rate\=\(int\)8000"
/GstPipeline:pipeline0/GstQueue:queue0.GstPad:src: caps = "application/x-rtp\,\ media\=\(string\)audio\,\ payload\=\(int\)0\,\ clock-rate\=\(int\)8000"
/GstPipeline:pipeline0/GstRtpPcmuDepay:rtppcmudepay0.GstPad:src: caps = "audio/x-mulaw\,\ channels\=\(int\)1\,\ rate\=\(int\)8000"
/GstPipeline:pipeline0/GstMuLawDec:mulawdec0.GstPad:sink: caps = "audio/x-mulaw\,\ channels\=\(int\)1\,\ rate\=\(int\)8000"
/GstPipeline:pipeline0/GstRtpPcmuDepay:rtppcmudepay0.GstPad:sink: caps = "application/x-rtp\,\ media\=\(string\)audio\,\ payload\=\(int\)0\,\ clock-rate\=\(int\)8000"
/GstPipeline:pipeline0/GstUDPSrc:udpsrc1.GstPad:src: caps = "application/x-rtp\,\ media\=\(string\)audio\,\ payload\=\(int\)0\,\ clock-rate\=\(int\)8000"
Setting pipeline to PLAYING ...
/GstPipeline:pipeline0/GstQueue:queue1.GstPad:src: caps = "application/x-rtp\,\ media\=\(string\)audio\,\ payload\=\(int\)0\,\ clock-rate\=\(int\)8000"
/GstPipeline:pipeline0/GstQueue:queue1.GstPad:sink: caps = "application/x-rtp\,\ media\=\(string\)audio\,\ payload\=\(int\)0\,\ clock-rate\=\(int\)8000"
/GstPipeline:pipeline0/GstQueue:queue1.GstPad:sink: caps = "application/x-rtp\,\ media\=\(string\)audio\,\ payload\=\(int\)0\,\ clock-rate\=\(int\)8000"
New clock: GstSystemClock
/GstPipeline:pipeline0/GstMuLawDec:mulawdec0.GstPad:src: caps = "audio/x-raw\,\ format\=\(string\)S16LE\,\ layout\=\(string\)interleaved\,\ rate\=\(int\)8000\,\ channels\=\(int\)1"
/GstPipeline:pipeline0/GstAudioMixer:mix.GstAudioMixerPad:sink_0: caps = "audio/x-raw\,\ format\=\(string\)S16LE\,\ layout\=\(string\)interleaved\,\ rate\=\(int\)8000\,\ channels\=\(int\)1"

I have checked the audiomixer as alone, by the following format :
gst-launch-1.0 audiotestsrc freq=100 ! audiomixer name=mix ! audioconvert ! alsasink audiotestsrc freq=500 ! mix.

Its ok and two mixed audio heard from headphone.

And when try to receive one audio stream by using the following format, everything is ok so :
gst-launch-1.0 -v udpsrc port=5001 caps="application/x-rtp" ! queue ! rtppcmudepay ! mulawdec ! audioconvert ! alsasink device=hw:0,0

I really don't know how can I debug the issue and why it's not working, even I changed the command format to the following but still no audio heard : 

gst-launch-1.0 -v udpsrc port=5001 caps="application/x-rtp" ! queue ! rtppcmudepay ! mulawdec ! audiomixer name=mix ! alsasink device=hw:0,0 udpsrc port=5002 caps="application/x-rtp" ! queue ! rtppcmudepay ! mulawdec ! mix.

Thanks for your response.

-----Original Message-----
From: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org] On Behalf Of Baby Octopus
Sent: Thursday, August 10, 2017 4:57 PM
To: gstreamer-devel at lists.freedesktop.org
Subject: Re: mix two audio streams

Can you enable verbose mode (-v) and see what caps are negotiated? 
Also, check which device you are writing into when you use alsasink. 
Add 'level' element right before alsasink to see if the audio is actually silent or has valid samples(You need enable -m to see the message posted by
level)



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