Is it possible to track one stream for motion and record another on detection

Question

I am tracking streams from two cameras and the resolution is relatively big, providing good quality videos but putting the CPU under heavy load. The cameras can stream 3 versions of the captured video and I would like to track a low-res stream for motion, but when motion is detected, record off the hi-res stream. Can that be done? I am using the latest sackmotion code from github.

Environment

Motion version:	sackmotion
ffmpeg version:	1.0.10
Libraries:	ffmpeg
Server OS:	debian

-- NikM - 30 Jul 2015

Answer

I don't have a ready to use answer, but an idea how this could be achieved.

For the low res cam you would define an on_event_start script, which enables the recording for the other cam via http API actions.
Likewise an on_event_end script would then be used to stop recording of the second cam.