Shotcut can't open my OBS-printscreen-videos (MP4) anymore

[Elusien]

It would appear that OBS is generating MP4 files with Variable Frame Rate. See here:

Convert to Edit-friendly and Proxy clip ?

What is the difference between the ‘Convert to Edit-friendly’ and ‘Proxy clip’ ? For example, If I open a file with 1920x1080, Then choose a ‘Convert to Edit-friendly’ option to lower resolution, What happened? Thank you !