So it appears my alsa configuration was messing things up a bit I think, and as I have only one app using audio, there is only little interest in not using the default pulse config... A parallel thread regarding AEC points out to time scheduling issues on raspberry pi.
So I could make AEC work by: - removing my alsa config and just keeping the default pulse device - loading module-alsa-sink with tsched=off - defining my echo-cancel sink and source as default
Now the autoload creates an additional sink for the alsa device alsa_output.platform-bcm2835_audio.stereo-fallback and sets it by as the default sink, overwritting the default sink i defined in the configuration.
How can i force pulse autoload to either not add that input device, or not set it as default sink?
thanks Monkey
On Tue, 2020-05-19 at 13:00 +0200, Monkey Bizness wrote: Hi,
I'm hoping someone here can help me figure out how to setup my configuration properly.
I'm trying to output sound through the echo-cancel module but by going through the alsa device. Unfortunately, the application doesn't support pulseaudio for the playback.
configuration: raspberry pi 4ubuntu 20.04 ffmpeg : 4.2.2-1ubuntu1 pulseaudio : 13.99.1-1ubuntu3.2
In order to do that, i've defined the echo-cancel configuration in /etc/pulse/default.pa:load-module module-echo-cancel use_master_format=1 aec_method=webrtc aec_args="analog_gain_control=0\ digital_gain_control=1" source_name="echoCancel_source" sink_name="echoCancel_sink"
It works. I can test it with : ffmpeg -i recording.wav -f pulse -device echoCancel_sink test
Now in order to playback through alsa, i've defined a pcm device: cat /etc/alsa/conf.d/90-echocancel.conf pcm.pulse-echo-cancel {
type pulse
device "echoCancel_sink"
}
ctl.pulse-echo-cancel {
type pulse
sink "echoCancel_sink"
}
When I try this configuration with: ffmpeg -i recording.wav -f alsa pulse-echo-cancel
Sound is scrambled and super slow.
Does anyone know how to make this configuration work? Any pointer would be appreciated.
I feel I got the correct overall approach but i am missing something about the rate convertion or specification.
Best regards
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