[mythtv] Patch for PowerPC

Mino Taoyama mythtv at taoyama.com
Tue Mar 23 04:58:27 EST 2004


I do have it working with a seperate PPC system.  I definitely would 
like to get the patch to fix the frontend.  I'll work on making a patch 
for the backend.

The CPU usage I'm getting on the 1.25GHz Dual G4 running both the 
frontend and backend is around 130% as reported by top.  (This is the 
sum of both CPUs.)

I have a front end only running on a 450MHz Dual G4 and top is 
reporting about 30% usage.  The resolution is 640x480 with a 2200 
bitrate.  The Altivec support seems to help.


On Mar 22, 2004, at 10:59 PM, Gregorio Gervasio, Jr. wrote:

>>>>>> Mino Taoyama writes:
> m> This is my first patch so please let me know if I'm doing anything
> m> wrong.
> m> I've been able to get MythTV working on a PowerMac G4 (Dual 1.25GHz)
> m> running YellowDog Linux 3.0.  It required some changes to the 
> sources.
> m> I've included a patch against the 0.14 release.
>         It's good to hear that a PPC backend works but I think your
> patch will work only if both the frontend and backend are on PPC
> machines.  The nuv file header and frame headers will be byte-swapped
> and padded compared to the regular nuv files created on an x86
> machine.  I think the audio stream will also be byte-swapped.
>         I have a patch to make a PPC frontend work with an x86
> backend (software encoder).  If you are interested, I can send it to
> you.  I don't have patches to make a PPC backend work correctly so
> you'll to fix this yourself.
> [...]
> m> The systems works but CPU usage is very high.
>         Just for my interest, how much is the CPU usage and what
> resolution/bitrate are you using?  I have a 400MHz G4 and it is not
> quite good enough to decode 480x480 MPEG-4.  Does the libavcodec
> Altivec support help much?  (I was unable to compile the Altivec
> routines on my Debian system.)
> m> I'm using a WinTV Radio (model 401) card and I had to resort to the
> m> external audio cable into a soundcard since the alsa snd-bt87x
> m> driver wasn't working well.
>         Does btaudio work?  I think the bttv developer uses PPC
> machines.
> -- 
> Gregorio Gervasio, Jr.
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