HD mp4's on apple TV

Hey all,
I've downloaded HDTV episodes off my TiVo HD, and converted them into mp4 using VisualHub at 1280x720 at 24fps. These files will play fine in iTunes, but do not show on my tv.
What format do these HD files need to be in to play on my Tv?
Excuse me if I missed a search on the topic, please advise if I missed it.
Thanks!

So I've managed to get the files to show on the TV, but the framerate, at 24fps (ish) stutters too much. I suppose it was the high bitrate of the first batch of 24fps files that wouldn't show.
But, let me start from the beginning, if it helps.
I've downloaded episodes of a show (720p) off of my TiVoHD and converted them using VisualHub to:
Format: H.264, 1280 x 720, Millions, AAC, Stereo (L R), 48.000kHz
FPS: 29.97
Data Rate: 6042.31 kbits/s
Normal Size: 1280 x 720 pixels
Current Size: 1280 x 720 pixels (Actual)
These play great on my PS3, but I recently acquired an TV, and would much rather use that to stream media. Unfortunately, I trashed the original MPG2s, and deleted them from the TiVo, to free up disk space once they were converted to MP4. So I understand the quality is going to drop by converting them again. But at the moment I'm not concerned with quality as much as smooth video playback. If I can figure out how to convert 30fps 720p video for the TV without stutter, then I'll be re-recording the shows and starting from scratch when possible. Anyways, I converted these files to 24fps, and a bitrate under 3000, as per Apples specs on 720p video:
Format: H.264, 1280 x 720, Millions, AAC, Stereo (L R), 48.000kHz
FPS: 23.98
Data Rate: 2594.18 kbits/s
Normal Size: 1280 x 720 pixels
Current Size: 1280 x 720 pixels (Actual)
They show on the TV, but video playback stutters (due most likely to the 30fps > 24fps conversion) but...
I have a few episodes that I've downloaded from another source (and who knows who that is) and are 1280x720 @ 24fps and play beautifully on the TV, no stuttering:
Format: H.264, 1280 x 720, Millions, AAC, Stereo (L R), 48.000kHz
FPS: 23.98
Data Rate: 2436.09 kbits/s
Normal Size: 1280 x 720 pixels
Current Size: 1280 x 720 pixels (Actual)
So I guess my new question would be; How do I convert 1280x720 HD source files at 30fps, into 1280x720 HD files at 24fps that will play on the TV, and still keep smooth motion?
Have I thoroughly confused anyone? I much appreciate all your time taken and patience to help.

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