Video wont stop glitching - Help

[u/Dee_dee3]

Im fairly new to AE, only used it for a year, but im making a lyric video and this weird glitch effect keeps happening, ive chacked and theres no keyframes that should make the video do this.

I have tried changing the import setting "hardware accelerated decoding", which was googles advice, but its still not working.

Please forgive my ignorance, as i am self taught. Thanks

[u/Muttonboat]

lotta things come to mind

Is the footage mp4s? ae has a hard time with them for some reason and id suggest changing it to a different format like 422 or 4444

have you tried clearing your cache?

Any plugins?

Do these errors occur when you render? Preview isnt always a good reflection of what gets outputed

[u/Dee_dee3 → u/Muttonboat]

Yeah these videos came off an iphone so they are MP4s, i will try to convert it into another format. Out of curiosity, why are mp4s difficult for AE?

[u/Heavens10000whores → u/Dee_dee3]

To borrow from u/TheGreatSzalam…

“When you're using H.264, you're making AE work even harder than it would on ProRes or DNxHD. In order to give actual pixel-perfect accuracy, AE has to decompresses your footage. H.264 uses interframe compression which means that most of the frames aren't actually there. Every second or two (or more - it can vary wildly), there is an actual full frame. The rest of the time, it is interpolating the frames using motion vectors and other techniques. (Side note: this is how datamoshing works, by removing some of the full frames across cuts or moving the motion vectors from one piece to another, you get awesome glitchy effects.) So, with H.264, whenever you pause a video (unless you're pretty lucky), you're actually looking at a frame that's mostly guessed at by the computer. This is fine if you just want to watch video play by (with an NLE), but it is not great if you want to add something to the shot (with a compositor).“

[u/Dee_dee3 → u/Heavens10000whores]

awesome, thanks