Can't convert 16x9 to 4x3

I created a 39min 16x9 video using iMovie HD 6 with 16x9 footage from an HD video camera combined with still images and music. I have shared this with iDVD successfully to create a widescreen video. My in-laws do not have a widescreen TV so I am trying to share the movie from iMovie to QuickTime, converting it to NTSC 720x480, retaining proportions, using Letterbox. No errors get reported and the first 16 minutes of the video look great. However, after the first 16 minutes, the video image freezes while the rest of the audio track keeps playing for the full 39 minutes. The finished file is 629MB in size and the codec that quicktime uses was Integer H.264. My understanding was that QuickTime pro can handle up to 6GB...
Does anyone have any idea what is preventing the rest of the video portion from being converted? Is there a size limit? Would a different CODEC work? I have plenty of available disc space since I have a 1.5TB RAID (3 x 500GB with the largest sector sizes possible) so it can't be that. I also have 4GB RAM on this MacBook Pro so it can't be a lack of RAM.

It read direct from the DVD I had generated with iDVD and I chose the option to convert to 720x480 NTSC DV
Oh, I thought your input was from a HD source. I'm not sure if MPEG Streamclip handles HD aspect ratios automatically.
Anyway, with SD iDVD-generated input you can just follow the instructions in the previous link.
The 4x3 DV files generated are squished to that size horizontally rather than being letterboxed
Did you follow the instructions to the letter?
Notice that .dv uses rectangular pixels so some apps may display a weird aspect ratio although everything is OK. iMovie and a TV should automatically scale it to the correct proportions. Where are your evaluating the aspect ratio?

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Can't convert 16x9 to 4x3

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