Installed Shotcut latest Linux AppImage. Export Video did nothing, the job in the right pane remained at 0%
I got the source (git), compiled, built and AppImage, tried again. Same results.
After much digging I found that to export, shotcut starts melt using nice.
The relevant code is in meltjob.cpp line 111:
Except that in my distro (PCLinuxOS) nice is in /bin. Symlinking
cd /usr/bin ; ln -sf /bin/nice
Solved the problem.
However, I think it makes more sense to let the system figure out where nice is. I changed that line to
and verified that it works (with and without the symlink).