why wud u want to do that? for what app?

Try a different YouTube player.

i do not think that has to do with hardware/software acceleration.
hardware acceleration improves the video processing, better with it than w/o.
it is app specific, i.e. some apps under settings, u can disable or choose some other.

tx3mini is 4k30hz; if u play 4k60hz or some unconventional videos on youtube, u will get likely that.
it also depends on the youtube version u use; vanced, i dunno but i hv seen this with smart youtube.
suggest u select lower/auto; or try other youtube versions.
yr tv too... it must be able to handle 4k.

Download Latest official unmodded Youtube mobile and play the same clip, and it will play fine. If you insist on using YouTube Vanced, then try the latest version of Vanced. If still doesn't work, change to 360p, guarantee it will be fine at 360p on Vanced or Smart YT TV.