First, I have tried to find a solution to this problem on the forums, but haven't been successful.
My imported footage: gopro, 1080 60fps
exported: 1080 60fps quicktime
the issue I am having is 2 fold, one the export quality is very low and 2 the audio is badly out of sync and seems to become worse as the video progresses.
audio speed is fine, video speed seems to be slow.
everything works fine if I don't compress the export, but then I have a 100gb file for a 4minute video.