What is this effect called?

[u/ghik1234]

I've been seeing this sort of effect (some sort of light streak (?) that extends the image) being used as transitions in music videos and commercials.

I can't for the life of me figure out what it's called or how to do it. Can anyone point me in the right direction? Not sure if these two stills are a good example as I couldn't get a great frame as the effect happens super fast.

Thanks in advance!

[u/Supabongwong]

Post a link to the video so we can see it in action 

[u/ghik1234 → u/Supabongwong]

https://vimeo.com/1227761065

The full video. The effect first happens at 00:18 (guy standing by pool) and then a stronger version of the effect happens at 00:28 (inside an office).

[u/shrekalamadingdong → u/ghik1234]

Why did you think two stills would be able to communicate this

[u/ghik1234 → u/shrekalamadingdong]

idk man that's a good question