As a user, I’d like to view or extract a single frame from a screencast at the command line. In other words, I’d like to “crush” the recording up to a certain point so that it can be written to the screen without writing to any cell more than once.
It looks like this functionality already exists for testing the avt/virtual terminal; it simply isn’t exposed at the command-line.
This would also facilitate manipulating recordings in a scriptable way, e.g., extracting a portion of the recording, removing a section from the middle, or greatly simplifying automated testing of other projects. (I haven’t come across any other terminal emulator that lends itself to running headlessly/without displaying anything.)
I’m guessing it wouldn’t be difficult to also provide the option to output a frame as svg, as another user has already requested.