Thank you both - I confess I had not been aware of this feature! Shotcut continually amazes me with all of the things it offers. Now I have something new to experiment with …
On edit: I just searched for tutorials (from the Shotcut home page) on using the Freeze Frame command. The first one that popped up directed me to this forum entry: How to Freeze a Video Frame . Interestingly, this video does not use the Freeze Frame timeline action, but calls for something similar to what I had described in my post above - extracting a frame using the Export Frame command. This was generated back in 2021, so obviously I need a more recent tutorial. I found this one dating to 2024: Freeze-frame automation with Auto Hotkey . It uses Windows Hotkey automation … to do a Frame Export, if I understand it correctly. Hmm … here’s one that specifically mentions using time remapping: Freeze frame using time remap (no frame export needed) . But it uses a manual process of splitting, copying, and applying the time remap filter - not the automatic process that the Freeze Frame timeline action carries out.
I’m still searching, but I feel a little less foolish that I was not aware of this feature until now.
One more follow-up edit: It looks like the on-line user guide does not yet have documentation for the Freeze Frame feature - there is a page, but it simply notes the need for a trusted user to add documentation. I’m feeling better by the minute - still ignorant, but better!