Export fails at the end of every job, showing that it took 1.57 no matter what

The time you’re seeing is actually telling you where in your video the export failed.
firefox_2021-02-23_06-59-30
This is actually 1 minute, 57 seconds, and 32 frames.

So go to your to that exact spot and try deactivating filters at location.
To deactivate a filter, uncheck the box to the left of the filter.
With the filter deactivated, attempt another export.
If successful, delete the filter and reapply it.
Typically this works for several people.
shotcut_2021-02-23_07-01-16

Excellent job uploading the failed job log… at the bottom it shows:
Failed with exit code -1073741819

With that error code it’s usually because of a filter.

In this post you can see references to the same exact failure code.