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Message: <blockquote data-quote="edb49" data-source="post: 755028" data-attributes="member: 113639">Yeah, it's definitely caused by the file not being quite right. I've tried loads of different codecs now, and they all exhibit various artefacts.Looking on the Video Redo forums, they point the finger at the h264 standard being really complex. They try to avoid doing a big re-encode of the whole file, just doing small ones around the cuts, but the failsafe way of avoiding the artefacts is a full re-encode. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown    :(" loading="lazy" data-shortname=":(" />Obviously that comes with the problems of introducing more loss, 2-3 hours of CPU time, and bigger file sizes if you want to maintain most of the quality.</blockquote>