What's the video connection? Component, HDMI, what?
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According to the (very reliable) HT dealer who did my install, 25 feet is just about the point where HDMI cabling gets iffy. Give it a try - my set up (HDMI to the projector at rear of the room from electronics app 25' linear feet away, near the screen) worked out well. If you have trouble, I understand that HDMI repeater/amplifiers are available, but can get expensive.
If you go the the Blue Jeans cable site: http://www.bluejeanscable.com/articles/how-long-can-hdmi-run.htm?hdmiinfo you'll find all the info you need about length limits on HDMI cables.
HDMI cable testing by the HDMI Authorized Testing Centers results in issuance of Compliance Testing Certificates, which are something of a guide to available cable lengths. The longest cable we have ever seen a compliance test certificate for is our own Series-1, which passed ATC testing at 45 feet under HDMI 1.3a (CTS 1.3b1);