local-peer-setup: try to make UDP recv/send buffers for video streams larger
local-peer-setup: try to make UDP recv/send buffers for video streams larger

By default these can be quite small, possibly smaller than a single
jpeg image from an HD webcam, which means that UDP packets might be
dropped already when sending or receiving since we write all ~200
or whatever packets for a frame in one go instead of spacing it out
over time.

Fixes very choppy video image in some cases.

jhgorse/onevideo,jhgorse/onevideo