I have issues with h265 files and I've reduced the bug to just demuxing and muxing an mp4. The input file plays fine in QuickTime, but the output plays with stutters. It does play fine in another player like IINA. See here for a simple demux/mux pipeline: https://gist.github.com/Doerge/903243abde51bda3468f20ca27fc966f QuickTime is a piece of garbage, but it's the default player for Mac users, so I can't get around it. Anyone experienced this, and resolved it somehow? Files below are input and output file respectively.