Thanks for answering.
I will keep using mp4box and/or mp4creator.
+++++
EDIT:
Hummm, according to a page written by the VFR_Maniac,
"muxer" is just a renamed upgrade of "
audiomuxer"
:—/
However, "remuxer" is as stubborn as the MP4 audio muxer
:—/
So, IF L-Smash cannot work properly outside of x264,
THEN
¿what is the point of those standalone applications
?