According the iTunes specifications for Apple TV (HD) could be any of these formats: (Apple TV is very high quality and will display on any computer with a high speed connection. Apple TV is a box that Apple sells for delivering podcasts on your TV. The product is not that popular and is becoming obsolete with many other methods of delivering podcasts becoming available.)
Input Output
640x480, 30fps 640x480, 30fps, 3mbps*
1280x720 24fps 1280x720, 24p 5mbps*
1280x720, 30fps 960x540, 30fps 4mbps*
1920x1080, 24fps 1280x720, 24fps 5mbps*
1920x1080, 30fps 960x540, 30fps 4mbps*
1080i up to 60fps 960x540, 30fps 4mbps*
iPod and iPhone can play the following video formats (These will work on your computer low resolution or on other smart phones as well):
H.264 video, up to 1.5 Mbps, 640 x 480, 30 frames per sec., Low-Complexity version of the Baseline Profile with AAC-LC audio up to 160 kbps, 48 Khz, stereo audio in .m4v, .mp4, and .mov file formats
H.264 video, up to 768 kbps, 320 x 240, 30 frames per sec., Baseline Profile up to Level 1.3 with AAC-LC audio up to 160 kbps, 48 Khz, stereo audio in .m4v, .mp4, and .mov file formats
MPEG-4 video, up to 2.5 Mbps, 640 x 480, 30 frames per sec., Simple Profile with AAC-LC audio up to 160 kbps, 48 Khz, stereo audio in .m4v, .mp4, and .mov file formats
The compression format H.264 is highly recommended so use that format whenever possible.
If you are working on an Macintosh and have the "Compressor" software that comes with Final Cut Pro, there are presets for these formats.
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