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["David M." <n36078@xxxxxxxxx>]

I can confirm that the bug still exists.  Late May download of 12.04 and
install of MythTV from packages.  Card was CA0106 but problem also
happened with internal sound card and usb X-Fi.  Symptom was no sound on
recordings and bad parameter message in mythbackend.log.

Adding PULSE_INTERNAL=1 to startup script fixed it.

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https://bugs.launchpad.net/bugs/633452

Title:
  MythTV Backend fails to record audio, due to PulseAudio

Status in “mythtv” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: mythtv

  I have my MythTV backend set up to record audio directly from an ALSA
  device provided by my capture card. Most attempts to record produce
  the following errors in mythbackend.log:

  2010-09-08 11:42:36.208 AudioInALSA(tuner) Error: pcm open failed: Device or resource busy
  2010-09-08 11:42:36.401 NVR(/dev/tuner/video) Error: Failed to open audio device ALSA:tuner
  2010-09-08 11:42:36.459 NVR(/dev/tuner/video) Error: Failed to init audio input device

  I have determined that this is due pulse's support for re-routing ALSA
  access to the pulseaudio daemon. This behavior doesn't make much sense
  for the MythTV backend, since pulseaudio is a user-level daemon by
  default and mythbackend is system-wide and should work even when no
  users are logged in. Therefore it's best to bypass pulseaudio in
  mythbackend. The environment variable PULSE_INTERNAL can do that.

  If mythbackend is started with PULSE_INTERNAL=1 in its environment,
  the problem goes away and it records sound successfully every time.

  What I'm doing right now is I edited /etc/init/mythtv-backend.conf and replaced
    exec /usr/bin/mythbackend --logfile /var/log/mythtv/mythbackend.log --user mythtv
  with
    script
        PULSE_INTERNAL=1 exec /usr/bin/mythbackend --logfile /var/log/mythtv/mythbackend.log --user mythtv
    end script

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