Phyllis found the solution; I'm reposting her letter because lately
she's been using only the "reply" button instead of "reply to all"
;-)

OK, ok, I changed my default to "reply all". I never look at the "from" and just assume it is from Cinelerra.GG.

There must be some nuance bug in the code."

Not a bug in the code per se, just needed to add a file called dpx.dfl in the directory ffmpeg/video (like all the rest of the options have).

I checked this into GIT just now so it works right without having to remember to do some extra steps (maybe Andrea can verify too).

And now I have checked all of them and found the same problem with "jp2" which is also missing "jp2.dfl" so I will check that in next time I power up the desktop.

Now, with this trick, it always works for me without the need to paste
the links.

About this:

For me it fails to build with patches, always errors. Even trying to
build manuvi git leads to compile errors.

Should I be looking at manuvi git and try to build with Andrew's patches? I need to look back at the email to see what this is all about. I would like to add anything that people are using! Let me know.