[mythtvnz] High CPU usage decoding 720p

[Jonathan Marshall]

You could try building ffmpeg with the cabac patch which allows
threading of this portion of the decoding process.  It's not yet in
ffmpeg mainline, as there are possible issues with some types of
options (MBAFF I think - not sure if this will affect NZ freeview
transmissions)

http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2007-September/035877.html

XBMC for linux includes this patch and it has dramatically sped up
playback of h264 material on multi-core processors.  You could even
try XBMC as a front-end to myth to see whether it makes a difference -
see xbmc.org for more details (disclaimer: I am a developer on XBMC).

Cheers,
Jonathan

On Fri, Feb 29, 2008 at 11:39 AM, Kenneth Dixon <ken.dixon at clear.net.nz> wrote:
> Hi, when decoding the 720p streams from TV1 or TV2 my CPU
>  usage sits between 60% - 100%, video gets a bit choppy on
>  100%.
>  My CPU is a AMDx2 4200, which I thought would have been
>  powerful enough, so I'm wondering if it is inefficiencies in
>  the software?
>  Here are my specs:
>
>  AMDx2 4200, frequency scaling = on-demand (working fine)
>  Mythbuntu 7.10
>  Nvidia 8500GT + Latest drivers (closed source)
>  SVN ffmpeg
>  Mythtv 20.2 + fixes
>
>  Any suggestions? am I missing something?
>
>  Thanks, Ken
>
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