Comment 7 for bug 921287

This was posted on the forum and I thought it might shed some light on the problem.

Here minitube, either the 1.6 in repo or 1.7 from site doesn't crash but both have significant issues. Seems they'll play some video's, usually music ones, but for most nothing or just sound.

What does work very well is the 1.7 version, (pre-built binary) with phonon-backend-gstreamer removed & phonon-backend-vlc installed instead

So at least here the issue is with gstreamer, not minitube

This is also confirmed here by extracting the repo minitube_1.6-1_i386 package, taking the minitube binary (1.6) out & running it.
It also works just fine with phonon-backend-vlc