[mythtv-users] Hauppauge Nexus-S hardware mpeg decoder

Tino Keitel tino.keitel at gmx.de
Wed Dec 6 09:49:00 UTC 2006

On Wed, Dec 06, 2006 at 00:04:29 +0100, andreas.mayer at eunet.at wrote:
> Hello,
> I'm new to this list and I'm very impressed by MythTV, it's a great
> piece of software.
> I was able to use my FF nexus-s card (rev 2.1) on my office
> workstation with 3.0GHz HT processor with MythTV.
> Then I decided to activate an old pc with 700Mhz PIII for use with
> MythTV. I supposed this hardware to be sufficient for one DVB-S card.
> It now appears that this is not true.
> When starting DVB-S live tv either with MythTV/mythfrontend or with
> kaffeine processor utilisation goes up to 60-70% and X and/or
> mythbackend/mysqld use the remainder of the processor.
> I know that running mythfrontend, mythbackend and mysqld on the same
> machine is not the best choice.
> Now to my question:
> Is dvbtt-pci/kaffeine/MythTV supposed to use the hardware mpeg
> decoder on the nexus-s card ?

MythTV: no. One reason is that MythTV likes to paint its own OSD into
the video output, and the Nexus-S card only has very limited features
for doing this. It also breaks the frontend/backend design of MythTV,
since the frontend would need access to the DVB hardware to show the
DVB video.

> Why is processor utilisation that high on linux compared to windows
> (see below) ?

I suppose Windows uses the hardware MPEG decoder.


More information about the mythtv-users mailing list