Exported video not smooth

yangsqr

The video is smooth when viewed in the app, but not smooth when exported. I didn't find any export video option in RC. How to solve it？
4K 50fps 8:7 video from gopro, iphone12 pro, RC 8.0.9

yangsqr

Exported video only 12.5 fps

aol_of_RaceChrono

Hi, yes there is an intermittent problem with the iOS video export frame rate, will be fixed in next version.