This will set the multicast-group, multicast-port, and packet-size
properties, and begin streaming via AcquisitionStart. Currently any
client can connect as controller and change these properties, but these
removes the requirement to have such a client.
This attemps to partially implement MISB ST1608.1, "Transport of Motion
Imagery and Metadata over GigE Vision". This relies on GstKLVMeta, which
is currently a merge request 124 for gst-plugins-base. For now we
include it here. Currently all KLVMeta is packed into one chunk, no
special handling of timestamps is done. Testing has only been done
between pleorasink and pleorasrc, no other MISB-compliant stream.
