Quicktime always reports MPEG-1 as a single frame movie, so that's unlikely to change.  Are videos other than MPEG-1 not playing?  

On Fri, Sep 21, 2012 at 11:40 AM, Hans-Christoph Steiner <hans@at.or.at> wrote:

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=64325&atid=507079

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
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