[mythtv] Any single-board solutions?
Fri, 13 Sep 2002 18:21:20 +0100 (BST)
On Fri, 13 Sep 2002, Grant Taylor wrote:
> - Dual CPU. The overall quantity of data sloshing about can be
> greatly reduced by using the mpeg4 code, and it looks like that
> will only be full-featured (particularly for the forthcoming pip
> features) when there is substantially more CPU available. Mythtv's
> coder/player threads won't split the work optimally in two, but it
> should still work out better.
My box currently uses mpeg1 format (not with mythtv). It captures and
encodes to mpeg1 using about 20% of my Athlon 1.13GHz CPU. Playback
(mplayer) is very light (<5%). I generally capture at 352x288. I can
capture two sources at once at that resolution, whilst playing back one or
two at the same time.
CPU isn't a problem for 2 simultaneous 720x576 captures, but I seem to hit
PCI bus latency problems with that much data on the bus.
Disk throughput is no problem because the mpeg1 gives high compression - I
generally capture at around 1.5GB per hour.
mpeg1 is quite a bit lighter CPU-wise than mpeg4. I'd suggest mythtv
should experiment with mpeg1.
A second advantage is its simpler to get from that the (S)VCD format