[mythtv-users] transcoding HD material to ease playback

Dan Christensen jdc at uwo.ca
Fri Jan 11 14:10:54 UTC 2008

I've got a frontend/backend that is just barely able to play some HD
material:  it's a 32-bit single-core mobile Athlon at 1.9GHz, with an
FX5200 video card.  I was surprised that it can play HD material at all,
but it does fine on most of the sample clips I've downloaded, using
60-80% cpu.  (I'm not using xvmc.)  However, in a few cases it is not
able to play the HD sample.  So I thought that I could transcode such
material into a format that requires less cpu to play:

1) The most obvious thing is to do the scaling ahead of time.  My
HDTV has non-square pixels, so almost all material needs scaling,
and I'm guessing that this will help a lot.  Or does the video card
do all of that work??

2) I wonder if lowering the bitrate a bit might help?

3) What codec should I use?  I'm not too concerned about disk space,
as these are just short clips I'm playing with to see how my HDTV

Comments, and even specific command lines, are welcome.



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