Mic recording and video recording seem to be out of sync

[TiborUdvari]

The audio input seems to cut off after the video input resulting in my video having the last frame repeated while still playing the extra audio recording at the end.

I'm using iOS 11 on an iPhone SE, running some semi-intensive OpenCV calculations.

[TiborUdvari]

Update: it seems to be working when not setting the FPS on the videowriter