Ok, This is definitevely not a good day for me ...
The VP3 datarate was 6 times the 143Kyte/s set in the "use target datarate
of" field in the compression VirtualdubMod's compression window. VP3
apparently didn't react well to this imput.
In the Compression setting the quality range is between 0 (highest) and 60
(lowest) but at 56 (default)with a limit to 1150Kbit and drop frames
unchecked VP3 couldn't go behind 2.3 times the limit set. The CPU usage was
55-80%, the size, of course, 640*480.
Gianni
----- Original Message -----
From: "Roger Howard" <email@hidden>
To: "Gen Kiyooka" <email@hidden>
Cc: "email@hidden" <email@hidden>
Sent: Friday, August 26, 2005 2:22 AM
Subject: Re: compression formula needed!
>
> On Aug 25, 2005, at 3:47 PM, Gen Kiyooka wrote:
>
> >
> > On Aug 25, 2005, at 3:26 PM, Roger Howard wrote:
> >
> >>
> >> On Aug 25, 2005, at 3:19 PM, Ben Waggoner wrote:
> >>
> >>
> >>> Craig,
> >>>
> >>> Whoof - reliable 640x480 on a PII? I'm probably go for MPEG-1.
> >>> CBR @ 3 Mbps?
> >>>
> >>
> >>
> >>>> on 25-08-2005 16:32, Craig Taylor at email@hidden
> >>>> wrote:
> >>>>
> >>>>>
> >>>>> I sent an e-mail recently about trying to strike the balance
> >>>>> between quality
> >>>>> and slower computer speeds on a current project. The minimum
> >>>>> specs for the
> >>>>> target machines are: Pentium II MMX, 128MB RAM, 32x CD. We are
> >>>>> streaming
> >>>>> straight from CD and there is a couple videos that run 5-8 minutes.
> >>>>> Sorenson is just proving too much for the processing power even
> >>>>> using CBR
> >>>>> and dropping frames. Skipping video, loss of sync. Any
> >>>>> suggestions on the
> >>>>> next best option. (We need to try and run at 640x480, but will
> >>>>> drop size if
> >>>>> absolutely necessary.)
> >>>>>
> >>
> >> Ben, you could maybe decode MPEG1 on that CPU... but a machine of
> >> that vintage is very unlikely to be able to get 3Mb/s out of a
> >> CD-ROM!
> >
> > He's referring to MPEG- oriented bandwidth requirements, megabits /
> > second, which is
> > basically 2X CDROM, fine for that vintage of machine.
>
> Argh, of course you're right! Ben too...
>
> -R
>
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