MSAQTPlayer is a Mega Super Awesome (& mega super simple), fullscreen / multiple output Quicktime player with fast, greater-than-4096-pixels support (for Mac OSX).
It exists for a simple reason: There are no applications that can play large quicktime files across multiple outputs of your graphics card, with good performance.
I wrote this app for an installation because I needed to play a 4,800 x 600 Quicktime file across 2 outputs on my graphics card, each feeding 3 triple heads to go into 6 projectors, and I couldn’t find a single application that could do it.
Most video applications which can output across multiple video-outs cannot play files larger than the maximum size of a texture (usually 4096 pixels at time of writing). And even if the movie resolution fits in a texture, they are very slow because they convert each frame to a texture and upload to the graphics card. The only application I found which could play a large file is Quicktime Pro, but that cannot output across multiple video-outs. MSAQTPlayer is a native Cocoa app which can do all of this.
Judging by the ‘thank you’ emails I’m getting, it is being used by many video artists around the world.