There is an outstanding bug where many videos don't play with Gem. Right now, this bug in Gem is the only thing holding back the final release of Pd-extended 0.43.1.
http://sourceforge.net/tracker/?func=detail&aid=3517368&group_id=643...
Is there a fix for it that I can include in the Gem version included in Pd-extended 0.43.1 (the most recent Gem release).
.hc