Video Audio Lose Sync in Hitfilm
I shoot mpg2 video with ACC audio 48000.
For editing I convert to Prores. Video and audio still in sync all the way thru. (20 minute clip)
I edit in Hitfilm Pro. Everything in sync on timeline playback.
Final render starts drifting out of sync half way thru timeline and is a good 3 seconds out of sync by the end.
AMD Architecture 8 cores, Radeon RX-480 Graphics (8 gb mem onboard), 16 gig system memory.