Streaming on low resource

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Hello,

I have an http stream in MPEG1/2 Video (mpgv)
Frame rate: 50 4000kb/s

It's basically the output of a satellite receiver with various resolutions.

480/576
544/576
720/576
704/576

Anyway, I have a P4 1.6GHZ with 512M RAM and 1024kb UL speed... I have
been trying to transcode and stream the signal to LAN, but my
principal intention is to stream to Internet. I'm using these options
in VLC which I found giving the best results.

Code:
:sout=#transcode{vcodec=mp4v,vb=650,fps=24,scale=0.5,acodec=mp3,ab=90,channels=1,samplerate=22050}:duplicate{dst=http{mux=ts,dst=:6666/},dst=display}
:no-sout-rtp-sap :no-sout-standard-sap :ttl=1 :sout-keep



I would like to ask you for any suggestion about any improvements...
I'm using Http because that's the only protocol I got running on
Internet... I got RTSP on LAN running but with no luck on Internet...
I'm doing NAT, so do you have any good experience with a particular
protocol.

I didn't see any difference with encapsulation methods, but I would be
pleased to hear your word.

Codecs: as you can see I'm using mp4 + mp3, the scale 0.5 is
sufficient but could you propose other parameters?

If I ever wanted to update the hardware what would be the priority,
CPU or RAM... I know both are needed...

Finally, I'm streaming from ubuntu 10.10 and any specific lightweight
distribution is welcome... as well as any other program similar to
VLC.

Thank you!
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