Help question about video format, recording, playback and HDMI out


Android Enthusiast
Ok guys have some questions. first off i tried playing some videos i had coverted for the droid at 854x480 MP4. the files play great on the phone and look great but when i output them to my tv at either 720p or 480p they look like dog shit.
what is the best format for outputing to HDMI 720p

second question is the camera records stuff in 1280x720 and will play that file back, but when i try and encode an MP4 to 1280x720, the phone cannot play it. why is this?