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If it doesn't have to be a video but can be a slide show with where to click, psr.exe built-in. Videos are a PITA to follow anyway.
Otherwise, your graphics card's software suite should be able to do the trick. I know that GeForce Experience records, among other things, the desktop (if you allow), I'm rather sure AMD got something similar. No idea about Intel's gaming ambitions though (desktop recording is oddly enough often associated with gaming).
As a complementary bit of software, you could consider Vidrio [^] which combines your web cam with your main screen's background so that you can point directly at whatever part of the screen image you want to indicate. Works well for conferencing as well.
I am surprised by your review of Flashback Express - I use it all the time without blurry results. The freeware was good enough for all my purposes, but I paid for the Pro version, because I like to support good software. I have never used any of the Pro features - the freeware is <b>that</b> good.
The interface is a bit wonky if you only want to record the webcam, but they seem to be working all the time to improve the software.
Note - they save their files as a proprietary FBR format, which seems great in terms of compression. But I use the built-in export function to change to AVI/MP4/WMV and have great control over how compressed I want the file to be.
I'm not sure that it is possible to capture the screen correctly while the resolution is changing. For something as oddball as this, I would probable go old school and capture the screen externally, using my phone as a video camera.
Not a software way, but if you have the gear to do it, something really worth considering.
My laptop has like many of it's era a VGA and an HDMI output on it. I also own a digital video recorder than can record from it's HDMI inputs as well as the built in tuner.
I can redirect my audio via the HDMI too, so all system sounds can be sent that way, including my narration.
All I do is set my "dual" monitor (HDMI + built in screen) setup in mirror mode so everything I see on the LT screen, is sent out of the HDMI, then I just set my DVR into record mode.
Once I'm finished, I log into the DVR via FTP and it allows me to download the recordings from it's hard drive.
The DVR is actually an old CCTV recorder box I snagged off eBay ages ago for about £20, it had no cameras, but it has 8 composite and 4 HDMI inputs. I've upgraded it and put a 2TB Sata drive in (It was originally 500gb) but it gets me a perfect recording every time.
If your doing a LOT of video production like this, it's actually something worth buying.
While I still recommend Flashback Express Recorder, I <b>just</b> was alerted to a Windows Feature that I didn't know about previously.
Apparently by typing WindowsKey+G, you get the XBox game app which has a screen recorder.
Also, Win+Alt+R is a faster shortcut to the same screen recorder.
Just thought to share.
<a href="https://www.laptopmag.com/articles/how-to-video-screen-capture-windows-10">How to Record Video of an App in Windows 10 | Laptop Mag</a>[<a href="https://www.laptopmag.com/articles/how-to-video-screen-capture-windows-10" target="_blank" title="New Window">^</a>]