Stanley,
I remember seeing your comment in an earlier post that h.264 + AC3 is not a valid combination but I just converted a .mov file with mono audio to AVI using H.264 + AC3. Only problem audio is a bit out of sync with the picture. Fixed bitrate produces a large offset while both 2 pass and 3 pass pruduce the same amount of delayed audio. Less delayed than that of Fixed bitrate.
Vijay
AVI with h.264 + AC3
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