Can I use rtmpdump to buffer a stream?

[magni]

I want to use one of my computers as a tv. That means turning the monitor on/off with a remote, changing channels with a remote, etc. I have figured all the important technical stuff out, except this one:

When changing a channel, it needs to be done fast. Nobody wants to wait 2-5 seconds each time. So I need to buffer multiple streams. Let's say I'm on channel 5, then buffering channel 6,7, and 8 would be nice when pressing the "channel +"-button. But of course I don't want to watch it with 5 or 10 minutes delay. I'm ok with watching the channels with a fixed delay of maybe 10-20 seconds.

Is it possible to use rtmpdump as a buffer for a stream? I just need VLC to be able to connect to that stream. I don't want VLC to initialize the stream because that would be too slow when changing channels. The switch has to be immediate.