I've got a great little IP security camera - the Y-Cam. It's Internet accessible, so it can email me photos of any suspicious behaviour. It will also stream video and audio to a number of devices - including mobiles.

Under Linux, it's very easy to get the video and audio via mplayer.

mplayer http://username:password@example.com/stream.asf

And we get this rather spiffy video playing.

In fact, there are a number of streams available (depending on camera), including RTSP and 3GP. The ASF stream seems the most Linux friendly.

It's also possible to save the video to a file - so if you catch a miscreant in the act of pilfering, you have video and audio evidence.

mplayer http://user:password@example.com/stream.asf
    -dumpstream -dumpfile ycam.asf

You now have a file which can be played back.

What I can't seem to work out is how to do the two together. I want a command which will show me the video and at the same time save it to disk.

So, fearless Internet commentors - any helpful suggestions?