No no, I was thinking about my PC, not my phone. My phone's also too old to be able to open or even receive any video data.
And no, I have no exckusions set in Avast, I like all my files scanned from time to time.
Well, nothing's wrong with simply scanning all the video files with Avast, but I still can't be sure, no AV has a 100% malware detection rate.
Thank you all for answers!