[mythtv] hardware needed to smoothly record a show while watchinganother

Matt Zimmerman mythtv-dev@snowman.net
Fri, 13 Dec 2002 11:32:07 -0500

On Fri, Dec 13, 2002 at 03:27:34AM -0800, Bruce Markey wrote:

> Henk Poley wrote:
> >>Van: Bruce Markey <bjm@lvcm.com>
> ...
> >My guess is that you kept the encode-bitrate at the same setting. So the
> >compressor has less work to do in comparison to squeezing 480x480 in the
> >same space (?). Idem with decompression.
> Good point. Bitrate is a factor. Today I did some new tests
> with the current CVS and found that decoding CPU usage was
> very low for each of several resolutions. I used scaled bit
> rate @ 3300 for all of the test recordings.

Bitrate does not make a significant difference in CPU utilization in my
experience.  The size of the captured frames is the largest factor by far.

 - mdz