Difficulty playing large MPG file in Quicktime

I recently built a large (3 hour, 4.2GB) MPEG file with a Diamond PVR660 which plays fine on Windows Media Player but when I play it on my iMac (I bought the Apple MPEG-2 Playback Component) the file plays fine for a while then at 1h30m the image and sound stop (but the time index continues to advance in the player). About 2h32m the file begins to play again through to the end. Are there size limits on the MPEG-2 playback component? My intention is to use MPEG Streamclip to build a DV file for editing in iMovie. Any suggestions on how to proceed?
Thanks in advance for any assistance or sharing of similar experiences,
Scott

Apologies in advance for my ignorance, but I'm unclear on what you mean by "file container" in this context.
The file container is the type of file into which you placed the MPEG-2 data. Elementary streams normally use an M2V file container whose audio resource reference points to a separate AIFF audio file. Multiplexed data (normally MPEG-2 video with MPEG-1 layer 1, 2, or 3 audio) would normally be contained in an MPEG file container which is usually limited to 4 GBs or 2 GBs depending on how the disk was formatted. On the other hand, multiplexed VOB files (usually MPEG-2 video with either AIFF or AC3 audio) are normally limited to 1 GB for DVD use but can be longer.
Any suggestions how to split an MPG into pieces?
Normally I would recommend splitting them at the source -- i.e. on the computer where you say they were created and were playback supported. Failing that and since you already have the MPEG-2 Playback component, I would probably see if I could segment them in MPEG Streamclip.

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