Andrew, yes it works with new ffmpeg-4.4.patchB.  The Freelancer provided changes to libavcodec/encode.c to get it working.  If you look at encode.c for 4.3 versus 4.4 it has been wildly changed and that caused a problem for CinGG.  Andrew tested his big file that was getting the tail (the word tail is an interesting description!) too.  And thank goodness for bluray or we might not have discovered this until the users did.

I did remove the debug and print statements from the Freelancer provided fixes but not from the attached here.