I am using new Windows 10 Photo app.
Having this issue:
Go to albums, select an album
Select "watch" under the pregenerated video at top of page
Select "export or share" on right had side, pick any option (small, medium, large...)
The video is generated and placed in a folder.
PROBLEM is: every video I generate for export has a grainy transition corruption that makes the video pretty useless
Note: the video in the app ( prior to generation for export) plays just fine.
I have tried this on multiple albums and selections same issue
Here's an example of grainy garbage all over an other wise clear snapshot