Hi,
I am using Pulseaudio to send data from an application to 3 different outputs
simultaneously: HDMI, analog output and a G.722 RTP stream. To accomplish
this, I set up a null sink call g722 using the following setting in be
default.pa:
load-module module-null-sink sink_name=g722
sink_properties=device.description=“g722”
load-module module-combine-sink sink_name=combined
slaves=alsa_output.pci-0000_00_03.0.hdmi-stereo-extra1,alsa_output.pci-0000_00_1b.0.analog-stereo,g722
It actually works pretty great. I use ffmpeg to pull data from the g722
monitor and transcode it and send it out via multicast to the phones/speakers.
/usr/bin/ffmpeg -re -f pulse -i g722.monitor -filter_complex
aresample=16000,asetnsamples=n=160 -vn -ac 1 -acodec g722 -f rtp
udp://224.0.2.60:50000 <udp://224.0.2.60:50000>
The issue I am having is that ffmpeg underruns most of the time UNTIL I start
pavucontrol. Starting pavucontrol makes things behave beautifully. ffmpeg
gets a constant stream of data and the audio sounds great. What I cannot
figure out is what pavucontrol is doing to make things better. It must be
setting up something for the VU meters, but I am not sure that would actually
improve things, or why it would.
Thanks,
Travis
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