$ wget [URL]http://192.168.42.21:9989/onvif/media_service/snapshot[/URL]
--2014-10-16 13:02:40-- [URL]http://192.168.42.21:9989/onvif/media_service/snapshot[/URL]
Connecting to 192.168.42.21:9989... connected.
HTTP request sent, awaiting response... 200 OK
Length: 303212 (296K) [image/jpeg]
Saving to: 'snapshot'
100%[=====================================================================================================================================================================>] 303,212 1.10MB/s in 0.3s
2014-10-16 13:02:41 (1.10 MB/s) - 'snapshot' saved [303212/303212]
nayr@dispatch:~$ file snapshot
snapshot: JPEG image data, JFIF standard 1.01