[mythtv-users] Really confused about the backend server
Ray Olszewski
ray at comarre.com
Tue May 27 10:39:08 EDT 2003
At 11:25 AM 5/27/2003 -0500, Daniel Jimenez wrote:
>So basically, all the video is streamed over Ethernet to the front end?
>
>Is this choppy? Does the backend box do encoding and decoding, or does
>the front end do decoding? I realize 100 mbps is a lot of bandwidth...
>
>Also, the front-end machine basically just needs TV out and a nic?
[old stuff deleted]
The frontend does the decoding. So 100 Mbps is plenty (even the 50-60 Mbps
that 100 Mbps NICs really deliver, typically, is plenty) to transfer the
encoded file (on the order of 10-20 MB/minute, corresponding roughly to 1-3
Mbps).
The frontend needs a powerful enough CPU to do the decoding. I've been
surprised to see that my system (Celeron 1.7 GHz), which decodes standard
MPEG-4 files (encoded using avfile or mencoder, played back with xine)
using about 5% of CPU, uses almost 30% when decoding Myth captures ... so
the demands on the frontend CPU may be a bit more than you anticipate.
Not sure why this difference is occurring, or even if my experience it typical.
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