So when I load file and add it to the timeline the Shotcut ate all free memory (~17gb) and went to unending cycles of loading with low cpu usage, it was looking like this:
mouse loading cursor for ~20 sec
return to normal cursor for ~5 seconds (but can’t interact with GUI)
repeat
I tried to left it alone for a hour but nothing changed, any suggestions?
Don’t move the whole video to the timeline, just clip the last 7 minute when in the SOURCE viewer. See here for a description of how to do that: Cutting clips from the source to the playlist
You can also export from the SOURCE rather than TIMELINE.
If all you are doing is splitting off the last 7 minutes and you are not doing any editing you can use a simple video splitter like MP4Splitter (https://www.mp4joiner.org/en/), don’t let the name of the website fool you.