use turbowarp: https://turbowarp.org/1290254934?turbo import the video.txt from this converter into the video list. https://scratch.mit.edu/discuss/topic/871733/ 80p video is playable at ~30 fps IN SCRATCH 960p can play but only at ~10 fps in turbowarp for some reason colors are corrupted now and I did not change the converter. the included video was made before the random corruption. videos files are very large due to it being raw video data. 239 blocks.
even a 2016 Chromebook can run 480p at 17 fps changelog: V2: released V2.1: added skipping and repeating to speed up and save on costly operations. V2.2: added more optimizing.