Does not look like an libav bug to me.
** Package changed: libav (Ubuntu) = apt (Ubuntu)
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https://bugs.launchpad.net/bugs/1074241
Title:
package libavutil51 6:0.8.3-6ubuntu2 failed to
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: libav (Ubuntu)
Status: New = Confirmed
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Title:
** Tags removed: need-duplicate-check
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Title:
package libavutil51 6:0.8.3-6ubuntu2 failed to install/upgrade: no
package named `libavutil51'