Playlist deadlock / infinite loop

This QuickTime playlist causes the playlist to crash: http://science.education.nih.gov/supplements/nih1/Cancer/videos/act2/CB5_MSTR.mov

Most often, the playlist thread seems to deadlock. Sometimes, I also got assertions failures or segmentation faults, so there must be some races. This happens even without the Qt4 UI. So there are really two bugs: VLC does not handle infinitely recursive MPEG4 files (this will be filed separately), and the playlist thread is not robust.

Note: as the MP4 demuxer has been blacklisted for HTTP, you need to fetch the file locally first, then open the local file. Otherwise, you won't be able to reproduce the issue.

Forwarded from http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=517462

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