The other day I watched an animated movie (Monsters, Inc.), ripped to my hard drive, the format is .mkv. Oddly the video looked like it was "stuttering", kind of like viewing with a rapid strobe light. The audio seemed fine: smooth, no drop-outs, and synced with the video. I've posted about trouble with some Roadrunner cartoons I downloaded from archive.org and was educated about different frame rates, but this "artifact" was different in that frames weren't being skipped, nor did the "action" jump. That's the "Why Does MC Hate the Roadrunner" thread (I think in the MC29 forum).
I verified I am using MC28 and when I looked at my video settings I was surprised to find I'd selected JRVR Red October. I don't remember switching from JRVR. Even stranger, when I switched back to JRVR, the stuttering video went away and the video played normally.
Does anyone have a thought about what's going on? Do the renderer improvements in MC31 address different frame rates automatically (I never did figure out how to change my settings to get a 24 f/s video to play correctly)?