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[Nick <1037402@xxxxxxxxxxxxxxxxxx>]

Yes, I'm running Ubuntu 14.04 with recordMyDesktop v0.3.8.1 and I ran
into the same error message.

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https://bugs.launchpad.net/bugs/1037402

Title:
  JACK audio source: "Improper window specification" (exit status 2816)

Status in gtk-recordmydesktop:
  New
Status in “gtk-recordmydesktop” package in Ubuntu:
  Confirmed

Bug description:
  It seems that running rMD (v0.3.8) on Oneiric, using JACK as audio
  input is broken:

  *) If JACK is selected as audio input, clicking the "record" button immediately returns with the message:
  "exited with status: 2816. Description: Improper window specification."

  *) I've found a HowTo-website describing the exact same behavior:
  (http://angel-de-vicente.blogspot.co.at/2011_01_01_archive.html)

  "[...] you can click "Use jack for audio capture", but with this
  option enabled I always got errors like "... exited with status: 2816.
  Description: Improper window specification.", so I decided to record
  the sound (with Ardour) and the video (with recordMyDesktop)
  separately, and then mix it with Kdenlive."

  Unfortunately, I want to use rMD to record Ardour itself - so I can't
  easily use his workaround.

  *) With rMD set to record the regular "DEFAULT" device (without JACK),
  the video transcoding (after stopping the recording), shows the
  progress-bar - staying at 0% infinitely. Until I quit "qjackctl". Then
  the rMD transcoding window closes itself, and outputs a broken .ogv
  file.

  *) When restarting the rMD GTK-GUI with "JACK" enabled as audio source, clicking "record", returns the following error message:
  "exited with status: 4352. Description: Port registration/connection failure."

  *) rMD also does not show up as JACK client at all.

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