Re: Debian TVIO like PVR
On Fri, Nov 23, 2001 at 02:17:02PM -0500, Paul McHale wrote:
> > According to Tom's Hardware, realtime MPEG4 encoding requires
> > about a 600mhz
> > P3.
>
> Does this assume the encoding is all done in software? I would guess a
> hardware assisted MPEG encoder would require much less. But I have NO idea
> about this. I am just curious.
I doubt very much that a 600MHz P3 would be able to encode a MPEG4
stream in realtime. I would think a P3 600Mhz would be sufficent to
/decode/ a MPEG4 stream though. :)
I found a couple of references on MPEG4 on Toms Hardware so you can
look for yourselves:
Optimizing MPEG4:
http://www6.tomshardware.com/video/01q1/010223/
Best CPU for MPEG4:
http://www6.tomshardware.com/cpu/00q3/000925/
Quote:
> the conversion of a four-minute MPEG-2 sequence (test object) depended
> heavily on the used CPU and lasted between 10 minutes (AMD Athlon
> 1100) and 20 minutes (Intel Celeron 667).
Not even a Athlon 1.1Ghz managed to keep up to encode MPEG4.
>
> I know the Tivo doesn't have much horse power. They are case in point for a
> design which is just fast enough. They appeared to have spared every
> expense. It is an awesome unit. Just saying, I don't think they have a
> 600MHz processor ... Could be completely wrong.
Tivo doesn't use MPEG4 for it's compression to begin with. I'd guess
MPEG-2 or MPEG-1 with a hardware codec.
Much cheaper to throw in a custom chip that does the encoding/decoding
than using a general performance CPU as a replacement.
//Humming
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