someone … descending on a keyboard while the tune goes higher is some sort of voodoo
Not quite the same thing... but when I watch a piano/keyboardist recorded from the front with the whole keyboard showing, treble on the left end and low notes on the right, I have a hard time with the mental flip to follow the fingers and maybe learn some fingering or chords. What I do (when watching on my iPad) is lock the auto screen rotation and turn the screen upside down. Now it makes more sense when watching the hands!
As for video: while I’m not familiar with the screen mirroring in the youtube app or other flipping problems, there is a free solution for nearly all video woes: the Black Magic’s DaVinci Resolve professional video editor:
Professional video editing, color correction, visual effects and audio post production all in a single application. Free and paid versions for Mac, Windows and Linux.
www.blackmagicdesign.com
My video pro son turned me on to this video editing software a couple of years ago. I have been editing on other platforms for years (mostly Premiere, SpeedRazor) but Resolve puts them all to shame. This is a high-end package used by many professionals. The free version gets you almost all of the functionality but I paid a pittance for the Studio version upgrade. Resolve does like a healthy computer with plenty of storage space, a good GPU, and dual monitors make editing easier. The learning curve is not for wimps or the impatient but IMO well worth the effort for a serious videographer.
You can easily flip, squish, color correct, adjust speed, do motion tracking, and so much more. Work in just about any format known to man. There are zillions of on-line tutorials and fanatics who live to help.
(BTW, I have no stock in their company nor get a penny for pushing it! I'm simply a much impressed user.)
If anyone here is the least interested, this is a shortened version of the first video I did with Resolve, part of a demo for a woodworking club. It's 4 minutes long, actually a MUCH slashed version of a 45 minute video I did on the same subject for another club for a zoom meeting during COVID lockdown. (Even the 45 minute video is a shortened version of my 4 hour bandsaw class!)
Very short video edited in Resolve. No fancy mics. No original music. All video and photography by JKJ.
The point is, I learned Resolve from scratch in a very short time, enough to do this and longer videos. There are better and cleaner ways to do some of the edits but this worked for a time crunch. And although I used almost none of it for this little video, Resolve has some powerful professional audio editing and mixing features.
JKJ