OK, so I went down the rabbit hole, just like Alice in Wonderland.  The manual has the lines to a similar working script that is easy to access:

   https://cinelerra-gg.org/download/CinelerraGG_Manual/Image_Sequence_Creation.html

In executing mkframelist, which mostly works although /dev/stdin does not have permission by default (can just be easily changed to "cat -"  instead), I still could not create a workable sequence list without doing additional editing.  It has some advantages over the one in the manual, but I decided to slightly improve the one in the manual instead to make it clearer and more flexible.  I checked this Manual change into GIT.

So in summary, I do not think it necessary to include mkframelist (which is no licensing problem since the script says Creative Commons) because it is just as easy to reference the manual and the capability will not be lost.  If you disagree, please just let me know.  Thanks, Phyllis

On Tue, Dec 7, 2021 at 9:05 AM Andrew Randrianasulu via Cin <cin@lists.cinelerra-gg.org> wrote:

I wonder if this old script still works (should make Cinelerra framelist for dir full of images) and if so - can it be included in 'contrib' folder of source tree (because hunting it via google or reimplementing each time one need to make 'list of images' input file for Cin... a bit counterproductive?)

not sure about license - this is just support script, not linked to binary and not requred for main editing operations - but still useful IMO for working with image files generated by some other program

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