Apple's DVD Player: audio in-sync. External DVD Player: audio out of sync

I exported my Sequence from FCP to QT, used compressor to make m2v and ac3 (Dolby) files, then used DVD SP to burn a DVD.
When I play the DVD on my Mac Pro using Apple's DVD Player, MPEG Streamclip or VLC, the audio is in sync with respect to the images, FCP's Canvas and FCP's QT export.
But when I play the DVD using any of three different external DVD players, the audio momentarily drifts out of sync by 30 to 40 frames, near the end of my 30-minute program, but is back in sync after about a minute, when the shot at hand ends and the next shot begins.
More specifically, it's as if the video lags by about 30 to 40 frames, but there is no stuttering or other obvious visual sign that this is happening.
Why would Apple's DVD Player, MPEG Streamclip or VLC play the audio in sync while these external DVD Players play it out of sync?
I should add that in order to verify that the TVs to which the external DVD players are attached are not the source of the problem, I monitored the audio using headphones connected directly to the audio outputs of the DVD Players as well as connected to the headphone jacks of the TVs, and there was no difference, i.e. in both cases, the audio drifts out of sync momentarily, as I describe above.
I can only think that DVD SP is muxing the m2v and ac3 file in such a way that software DVD players can demux it without difficulty, but hardware DVD players cannot.
Does anyone know how to fix this problem?
Thanks.

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