OS: Windows 10 Pro 20H2 (and Ubuntu 20.04 LTS)
Shotcut version: 21.02.27 64bit installer version
If I import a video recorded by a Google Pixel 5 device in 4K60FPS, move it to the timeline and then export it with the default settings, Shotcut only produce an mp4 file without video stream and a few hundred kB of size.
The problem can be reproducible with 21.02.27 appimage version on Ubuntu 20.04 LTS on a different hardware.
One time (I don’t know how) I made a successful export and I saved the log from it. Looks like the hardware acceleration is not important in this case, the process creates a file without video stream with and without it.
The sample video what I want to cut is here https://photos.app.goo.gl/bib9Y4i3XdrC1Pco8
The failed output mp4 of the export and the export logs can be found here: https://drive.google.com/drive/folders/1uD-mEcpD-I-jqqP0R5VIlj-q4kwJDpdB?usp=sharing