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I occasionally switch audio output from the ubuntu default pulse-audio to jack. this has created several problems that I haven't managed to fix in the past (no sound from firefox ever again, then switched to chromium which was fine), but now I am using google-chrome and whenever I switch on jack, I get no sound from the application. mind you, audio works fine from , say jukebox.

The steps I take to switch on jack are the following:

- run qjackctl
- start the audio server. 

Note: usually the PA tp jack source and sink modules haven't been started (why, oh why?) so I fire up a console and type in :

pactl load-module module-jack-sink channels=2; pactl load-module module-jack-source channels=2; pactl set-default-sink jack_out; pactl set-default-source jack_in

there, now jackd is up and running.

Now, I fire google-chrome from command line, and see the following when I visit a page in youtube to see a video:

[22624:22645:1119/] Not implemented reached in virtual std::string media::AudioManagerBase::GetDefaultOutputDeviceID()

Argh! any ideas?

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I fought with a similar problem using ALSA. For that, it was a question of creating a "default" alsa device (pcm.!default). Perhaps something similar with an alsa loopback device would work (see: – jwernerny Dec 13 '13 at 16:28

I had/have the same problems.

At the moment I have a workaround for it.

  • stop jack
  • start the player (youtube, webradio...)
  • start jack
  • in pavucontrol you can adjust the output of the app to the Jack Sink.

tried many possibilities. even the Cadence (from kxstudio) - "solution" didn't bring the suggested results...

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