[mythtv-users] A noob question regarding hardware req. andhardwarecodecs

[Scott Blomfield]

You are correct.
Formula:
Decoding: 500Mhz per stream (usually just one)
Software Encoding: 1000Mhz per stream
Hardware Encoding: 200Mhz per stream

So for a combined front-end/back-end with one pvr-250 tuner and one V4L
tuner you'd be looking at 500Mhz + 1000Mhz + 200Mhz = 1700Mhz

These numbers do assume intel CPU though. For AMD, use the XP rating and
add 100 or so. (I.e. use an Athlon XP1800+ instead of Atlhon XP1700+)

Hope this helps.

-----Original Message-----
From: John Wells [mailto:jb at sourceillustrated.com] 
Sent: Tuesday, August 05, 2003 12:32 PM
To: Discussion about mythtv
Cc: Discussion about mythtv
Subject: RE: [mythtv-users] A noob question regarding hardware req.
andhardwarecodecs

Joseph:

Joseph A. Caputo said:
> Probably not with your current hardware.  Possibly with a hardware
encoder
> (see below).
> General rule of thumb: ~1GHz per encoding stream, + at ~500MHz for
> playback.
> I've got an Athlon XP 1600+ handling a single V4L tuner, which is just
> about
> enough power.  It'd be nice to have a little more breathing room,
though.
> I
> definitely couldn't handle 2 V4L tuners without *really* sacrificing
> quality.
>
>> 2.  If I buy a hardware encoder like the Haupauge 250 or 350, what
sort
>> of
>> effect will that have on CPU requirements?  Assuming a purchase of
one
>> of
>> those cards, what CPU could I get buy with?
>
> A hardware MPEG encoder reduces the encoding load on your processor to
> virtually nothing.  Thus, with such a setup you really only need a
system
> that can handle full screen MPEG-2 decoding & playback.  A PIII-500
might
> be
> OK there.

Based on your above comments, and based on what I have now, if I buy a
Hauppauge PVR-250 or 350 and use the current ATI TV wonder as my second
tuner, am I correct in assuming that having only one PVR-250/350 will
force me to still have at least a 1 GHZ processor for recording and
watching live tv at the same time?

Thanks for your input!

John



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