Comment 26 for bug 1395635

libmlt libmlt++3 in Ubuntu 16.04 are still 6.0.0.0-2 .
So openshot still won't generate sound in an output video.
Debian current is 6.4.x.x for some x.x.
Openshot 2.3.4.

While nothing in openshot says what the grayed-out square/circle/slash
related to sound
in the attached property screenshot mean it is perhaps a hint
openshot won't write some sound?