I converted an AVI file, duration 1:26, size 2.5gb, 1280χ690, to a MP4 and it took less then 10 minutes.
I have an i5@3.2GHz, 8gb ram, a SSD, on Win10. I didn't believe it did it so fast.
The quality of the MP4 is better then the original AVI file!
Great work! Congratulations!