(Jim) Allows the ability to use stream keys with ffmpeg-mux -- this will
enable the ability to use it with certain services (such as YouTube)
which allow different protocols (such as HLS)
(Jim) Allows the ability to specify mux settings directly on the
output's structure itself rather than just via settings. This is useful
for network-based muxer outputs (such as HLS).
(Jim) printable_file allows the ability to keep a separate string for
logging which will not contain things like stream keys when used with
outputs such as HLS.
Maya Venkatraman