[Mary Rosa]

Many thanks Jim! I am now trying to add white text with a black bar background

-vf drawtext="fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf:text='TitleofVideo' :x=(w-tw)/2:y=(h-th)/2"

Error

Filtergraph 'drawtext=fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf:text='TitleofVideo' :x=(w-tw)/2:y=(h-th)/2' was specified through the -vf/-af/-filter option for output stream 0:0, which is fed from a complex filtergraph.
-vf/-af/-filter and -filter_complex cannot be used together for the same stream.

Example