Andrew,

Thanks for looking at this. After I finish testing SGE's BT #538 html improvements, I will at least try your suggestions and I plan to update the manual to clarify simple usage of Batch Render.

Right now I can only suggest you to look at

https://git.cinelerra-gg.org/git/?p=goodguy/cinelerra.git;a=blob;f=cinelerra-5.1/cinelerra/batchrender.C;h=6dcdbc62f69fd7bf8fcd0015f011de87b2e93786;hb=HEAD

...
basically try to comment out action:

// thread->update_selected_edl();

put two "/" before this line, and recompile.

...
May be it has something to do with internal use of batch render, for DVD/BD creation ?

YES !! I think I remember that it was implemented to facilitate DVD/BD creation because there was much debugging involved that was tedious.

There are about 250,000 lines of intertwined program code in Cinelerra-GG proper and rewriting code is not like rewriting a book's paragraph - it is generally non-trivial and requires more than just knowledge of C++.