qt-faststart gets into infinite loops, for various reasons, based on various kind of bad input files. We fixed up the code at my company, and have submitted the patch upstream today. I'm submittied an updated ebuild with the patch here, too. Reproducible: Always
Created attachment 174340 [details] media-video/qt-faststart-0.2 ebuild
Created attachment 174341 [details, diff] diff to correct various bugs
fixed and bumped, thanks for the report.