Sync Issues with Mark 3 Footage and Audio

[Jason Morehouse]

Hello,

My friend shot a film on the Mark 3 at 24fps. The audio is at 23.976 separately. The footage and audio are in sync on the timeline, but when I export to Quicktime 720p, the audio is off sync by a couple frames. I already tried changing the timeline setting to both 24fps and 23.976. Also exporting at both frame rates. What could be the problem? Thanks in advance.

[Richard Herd]

Try slowing down the audio to .999 ( 23.976/24).