As much as I'd like to, the max width I can create a mpeg video is 1920. I've looked and am unable to find a program that can create one wider.
Are you using a Eyefinity / 3DVS set up or a TripleHead2Go?
Another option is to create one at the same aspect ratio that you run, just at a lower resolution. 1920 X 360 would be doable and it's 16:3 ratio like the 5760x1080 that your using.
I run a dual monitor setup at 3840 x 1080 and I've got a few that work really well with that res. I've been running my "Rough Seas" dream in a streached setting and it works really great. A few others that work great in the "fill monitors" settings is "Matrix", "Squigly", "Squiglier", and "Particle Race" just to name a few.
