[mythtv-users] Should I prefer mp4 or mkv in Handbrake output?

[f-myth-users at media.mit.edu]

    > Date: Sat, 20 Sep 2014 19:23:30 -0400
    > From: Matt Emmott <memmott at gmail.com>

    > It doesn't sound like this would be a concern for you, but my Roku box and
    > mobile devices can't play HD MKVs, only MP4s.

Hmm.  Nope, not a current concern, and I'm assuming I can use
mkvtoolnix to extract just the MP4 and put it into an MP4 container
if I really had to.  (It sounds like MKV is a superset of MP4's
capabilities, so if I'm going to stuff everything into something,
it seems like MKV is the winner, followed by extraction (without
retranscoding) into an MP4 container if I run into something that
chokes.  If that's not right, I assume someone will speak up. :)