Help with Audio and Video sync issues

MarcN

New Member
Hi,

We created a trailer for our upcoming film using Davinci Resolve Studio 2.0 v 20.3.1 Build 6. The mp4 (and mov) file plays perfectly on my computer (no out of sync issues). We upload the file to our YouTube channel, and that uploaded video plays fine as well on my Windows computer using Edge browser. It even plays perfectly on my projector using a YouTube app on an Amazon Fire TV Stick.

However, if we try to play the video on my mobile (Android), my colleague's iPhone and TV (LG OLED25), we have audio out of sync in various places throughout the video.

You can see the video here -

The conversation after "HER BOSS" goes out of sync.
The conversation on the bench after "WHO WILL TAKE HER HEART" goes out of sync.
The conversation after "COMING THIS SUMMER" goes out of sync.
But the comment "WOW" never seems to.

Anybody got any ideas?
We have played the video at the different quality levels on the devices it works on and it works fine.
We have tried various settings in Davinci for rendering the video, and none seem to make any difference.
Things we've read online seem to point toward the specific devices being the issue, but I can't understand that.

Desperate for help....
 
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