Locking assertion sounds a lot like one of the multitude of libxcb issues.
Look for:
"xvidcap hangs on starting a capture session. What can I do about it?"
here:
http://xvidcap.wiki.sourceforge.net/faq#usage

Or for one of the libxcb issues, e. g. here:
https://bugs.launchpad.net/xorg-server/+bug/185311

-- 
xvidcap crashes while creating a lengthy video
https://bugs.launchpad.net/bugs/66664
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