[mythtv-users] Torn HD video with MythTV under Gentoo

Alen Edwards allen.edwards at oldpaloalto.com
Wed Jun 18 22:22:50 UTC 2008

Marc Barrett wrote:
> My setup involves a 3Ghz Dell Optiplex GX/270, with a 350G SATA hard drive, 
> 1.5G of RAM, and a firewire connection to a Motorola DHC-3200 STB.  I was 
> using a Ubuntu-based setup, which worked mostly, except that it would act like
> my box was just a bit too slow to keep up with playing almost-full HD video 
> (I have the STB set to 1080i, but my monitor is 1680x1050).  A lot of time, 
> the video on an HD channel would be "jerky", or the audio would stutter, or 
> I would have other problems.
> So, I decided to try to re-do everything with a Gentoo-based setup.  Under
> Gentoo, it does feel a lot more responsive.  All the SD channels work fine, 
> no problems.  Some of the HD channels work, like the HD version of the
> History channel.  But a lot of the HD channels have "torn" video;  the video
> has severe horizontal tearing, like adjacent scanlines are offset or something.
> I can't quite describe it.
> Anyway, I was wondering if someone who has a working Gentoo-based setup
> could give me your make.conf file.  Perhaps I could use that to do my setup
> again and figure out where I went wrong.
> I hope I can figure this out, because under Gentoo the few channels that do work, 
> work beautifully.  All the problems I was having with Ubuntu have gone away with 
> Gentoo.  I just don't know why I'm getting that tearing problem with most of the other 
> HD channels.
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I am surprised that you are having problems unless you are not using 
XvMC.  I almost had enough power with my P4 2.4GHz machine.  There was 
no tearing of video and only occasional hiccups in the audio.  This was 
with Mythbuntu.  It has a lot of the Ubuntu stuff removed to make it 
bare bones.  Hope this is helpful.


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