Lately, when rendering my edits, every single video is getting a few black screen glitches in between the clips. I use after effects cc 2021 and have macOS big sur (macbook air 2017). I haven't changed anything with what I have been doing, but suddently every video get's these glitches. I have made sure that there are no space in between my clips and even have tried overlapping them to try and fix to problem but it still persists. I don't know if this is a problem with media encoder, but it ruins my videos. I am attatching a clip where it happens.
From framerate mismatches to hardware acceleration issues this could be anything. Start by checking your hardware acceleration settings and as a test switch to software-only rendering and encoding. Also verify that framerates of your comps and the MPEG presets match exactly.