What is a .m4v file and what plays it?

I downloaded some video podcasts from iTunes Store and they do everything I would imagine they should, EXCEPT play through the Apple TV! They show up under "Podcasts" on the TV but when selected the Apple logo comes on the screen for a few seconds and then the system reverts back to the menu. When I go to Music > iTunes Music > Podcasts they are all there and have the .m4v, not .mp4, designation. I can use QT to convert, but... what gives here?

WC: Here's what the inspector says:
Source: /Users/Lancaster/Music/iTues/iTunes Music/Podcasts/The NewYorker Festival video/Steve Martin.m4v
Format: H.264 Decoder, 640 x 480 Millions, AAC, Stereo (L R), 48,000 kHz
FPS: 30
Playing FPS: (Available while Playing)
Data Size: 549.88 MB
Data Rate: 914.99 kbits/s
Current Time: 0:00:00:00:00
Duration: 0:01:22:49.20
Normal Size: 640 x 480 pixels
Current Size: 640 x 480 pixels (actual)
Appreciate your assistance. I would think this should play uneventfully, no?
LL

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