Yeah, I've played around with Burp Suite and come up with,
curl -u admin http://172.16.20.22/browse/settings/videoAudioSet.asp?_ie6need=on&PFR_=50&MVR_=0&MHR_=0&BLC_=1&WDR_=1&WDR_HFR_MODE_=0&Payload=1&resolution=33&framerate=15&IPRate=15&BitRateControlSelect=1&BitRate=6000000
But - it dosn't...