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@dacvideos, I had found the same. I didn't have a problem with H264 MP4 HD, until I upgraded to PD18. It looks, on a quick look, as though the audio is in front of the video, sync wise.

As has been said, exporting to m2ts instead of MP4 fixes it. Going back to the previous version of PD and the produced MP4 file is OK. Reinstalled 18 and sync problems again. The only problem I've found with PD18's m2ts is, MediaInfo reports PD's m2ts files as being the wrong extension, which does not happen to files produced on an old version of PD.

Also noted that the MP4 files produced by the old version are GOP M=2, N=29, sync perfect. Whereas PD18 is producing MP4 with GOP M=3, N=13 and the sync is out.
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