I have had tearing in with my Nvidia card and when I use fancy GUI recorders the quality can be poor.
There is a Nvidia bug that causes tearing and SimpleScreenRecorder offers to fix it first time you start it.
So do that; install and start SimpleScreenRecorder and accept the offer - then you can close it.
Next install ffmpeg it will be in your repos.
Then you go to a terminal and check your resolution:
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xrandr
This will list your possible resolutions and the one you are using has a * behind it (probably the one on top).
Something like this:
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Screen 0: minimum 8 x 8, current 1920 x 1200, maximum 8192 x 8192
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)
TV-0 disconnected (normal left inverted right x axis y axis)
DVI-I-2 disconnected (normal left inverted right x axis y axis)
DVI-I-3 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 59.95*+
1680x1050 59.95
1600x1200 60.00
1280x1024 75.02 60.02
1280x960 75.00
1024x768 75.03 60.00
800x600 75.00 60.32
640x480 75.00 59.94
As you can see; my resolution is 1920x1200 so I am going to use that below.
So far so good - now we are ready to do our lossless recording; type this in your terminal:
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ffmpeg -video_size 1920x1200 -framerate 30 -f x11grab -i :100.0 -c:v libx264 -qp 0 -preset ultrafast mymovie.mkv
This is going to record your desktop and save it to mymovie.mkv (use your resolution - not mine)
To stop the recording simply press q (for quit) in the terminal - I use drop down terminals for this.
Now go to the folder and click on mymovie.wmk and it will play in your media player.
You can upload the file directly to youtube but to save time you can shorten it down a bit without loosing quality - like this:
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ffmpeg -i mymovie.mkv -c:v libx264 -qp 0 -preset veryslow my_smaller.mkv
This step is optional.
And you will be blessed with a nice video of your desktop:
And here is the trick - you will never remember the command for recording so make an alias of it:
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alias makemovie='ffmpeg -video_size 1920x1200 -framerate 30 -f x11grab -i :0.0 -c:v libx264 -qp 0 -preset ultrafast capture.mkv'
So now you simply have to type
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makemovie
https://www.youtube.com/watch?v=Fnr08bCHtoc
It is as simple as that!