Welcome to the forum!
Have you looked at past threads about the same error code?
https://forum.shotcut.org/search?q=%20-1073741819
For many people it comes down to:
- Look at the time where the export stops and investigate your project around that time. Try removing filters or transitions around that time to see if one of them are causing a problem
- Try disabling antivirus programs before exporting
- See if there are any other cleanup/malware programs running that might be interfering
- Make sure you are using the latest version of Shotcut
- Try some of the suggestions here Export failed - Find solutions