it entirely depends on the capabilities of the device. USB by itself means nothing. some TVs and blu-ray players can play 1080p MKV files over a flash drive, while some (most) TV's have USB strictly for JPEG and firmware updates.
everything your TV or player can do is listed in the manual or on the website. the "u" in USB stands for universal, so just because a device like a phone, printer, dvd player or cable box has USB, it really doesn't tell you about what it's there for.
Last edited by alyarb; 02-12-2010 at 01:20 PM.