Jerky Motion of MP4 file

Problem: Jerky Motion of MP4 file
Adobe Production Suite CS4
Windows XP Pro SP3
I have the following composition:
Composition: 1280x720 HDV/HDTV 720 29.97 square pixel
Layer: 4288x2848 jpeg image
Duration: 15 seconds
I slowly rotate the image.
In AE, it plays smoothly using the space bar.
I render as
Container: MP4 file
Codec: H.264/MPEG-4 AVC
Size: 1280 x 720
kbps: 6176
Frames/s: 29.97
GSpot says the created MP4 file looks like the following:
Codec: avc1
Name: H.264/MPEG-4 AVC
Container: mp42: MP4 v2 [ISO 14496-14]; - mp41: MP4 v1 [ISO 14496-1:ch13]
Recommended Display Size: 1280 x 720
Size: 1280 x 720
kbps: 6176
Frames/s: 29.97
Pics/s: 29.97
I play the file in Adobe Media, QuickTime, and Real Players.
The motion is very jerky.
The time progression bar moves in stops and spurts.
I created a new MP4 file with kbps: 13,000.
It was also jerky.
I created an AVI file, it plays smoothly.
Any idea how to correct this?
Thanks in advance.

Thanks for the feedback about why H264 is jerky on my computer.
As you suggested,
I used the FLV preset to create two FLV files.
Codec: FLV4/VP62
Name: Flash/On2 VP6
kbps: 1699
kbps: 5409
Both files work much better than the H264 MP4 file.
The kbps:1699 file is a bit jerky.
The kbps:5409 file is more jerky.
Since the files are on my hard drive, I am not sure why the kbps:5409 is jerkier since that is the rate DVDs play 720x480 movies at. I would expect the kbps:1699 to be of poorer quality because of the lower bandwith.
Just so you know where I am heading. I want to place my 1280x720P HDV/HDTV 720 29.97 square pixel AE composition on Vimeo.
Vimeo recommends "using the H.264 codec at size 1280×720, bit rate 3000-5000 kbits/sec (optimized for “download”), key frame every 30 frames (frame reordering on), using whatever frame rate you shot in. For sound, use AAC at 128kbps in stereo."
By the way, there is a HD video on Vimeo called "FIA GT3 Video Battle" which GSpot says uses
Codec: avc1
Name: H.264/MPEG-4 AVC
Size: 1280 x 720
Frames/s: 23.976
kbps: 1803
I downloaded it to my hard drive. On my computer, it is a slightly jerky but not too bad. Why my video using the same settings is so much jerkier than this video is unclear. Of course, as you explained, I cannot expect a H.264 codec to keep up with my slower computer. It is also unclear if I should Set Key Frame Distance to 30.
Is there a white paper or book that explains in detail the tradeoffs and recommendations for both HD web based and Blue Ray situations like this? Thanks again for your help.

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