On Fri Nov 23 16:37:33 2001 Rich Puhek wrote...
>
>nate wrote:
>>
>
>One thing to remember is that the Tivo has a few minor advantages:
> 1) Your serial port/USB port probably has a fairly high-priority
>interrupt, this is why your mouse movement will cause your processor to
>stop working on the encoding.
> 2) The Tivo probably has hardware dedicated to the specific purpose of
>video processing (a FPGA/CPLD type device, or maybe even an ASIC), where
>as your PC has to make do with a general-purpose microprocessor.
> 3) Your microprocessor is a CISC device (i386 class, etc are all CISC
>processors). I would guess that it is quite likely that the different
>execution times for the different instructions would be a challange in a
>realtime (or near realtime) environment. The PowerPC is a RISC chip,
>which (among many other things...) means that every opcode on the chip
>will average about the same (around 1.5 to 1.7 cycles/instruction IIRC).
>It may not be a real big deal, but then again, might be interesting to
>see how performance is with Debian on PPC.
>
I've been playing with this this weekend.
Setup is a Athalon 750mhz, very lightly loaded machine, just really running
vcr.
I found thta with a resoluting of 384x288 I would drop a single frame or so
about every 2 to 5 seconds. Change the resolutin to a more usable 640x480,
and it goes up to like 25 frames every 2 to 5 seconds (esentially
unusable). Loooking at the CPU utilization, it was hovering aroun 40 to 45
percetn. Nothing else was going on.
So, where is the limitation here? PCI bus transfer speed? or what. How can
I improve this?
--
Stan Brown [EMAIL PROTECTED] 843-745-3154
Charleston SC.
--
Windows 98: n.
useless extension to a minor patch release for 32-bit extensions and
a graphical shell for a 16-bit patch to an 8-bit operating system
originally coded for a 4-bit microprocessor, written by a 2-bit
company that can't stand for 1 bit of competition.
-
(c) 2000 Stan Brown. Redistribution via the Microsoft Network is prohibited.
