[mythtv-users] HDTV/CPU survey

[Dylan D]

Hello john, that is weird because i've have no issues with hdtv+mplayer+2400 amd xp.
I noticed that yes when cameras panned or whatever it got a bit jumpy, But that wasn't a cpu issue it was a interlaced video issue, and applying  the ,
video=dfmbga:fiedlparity=top switch fixed that issue for me.
I would imagine that running something alot slower then the xp2400 would be fine, As top shows only 9-12% uterlisation when watching HDTV.
But then again that is over directfb(without X).


  ----- Original Message ----- 
  From: John Patrick Poet 
  To: mythtv-users at mythtv.org 
  Sent: Wednesday, April 28, 2004 11:18 AM
  Subject: [mythtv-users] HDTV/CPU survey


  I have seen a few people with Pentium4 processor report that they are happy with the playback of HDTV material.

   

  I, however, have not seen a single "success" report from an Athlon user.

   

  Is anyone getting acceptable HDTV playback under Myth, with an Athlon processor?  If so, what speed, etc?

   

  I am personally using a 2.6 GHz Pentium4, overclocked to 2.8GHz.  HyperThreading is enabled, and I have dual channel 433 MHz memory.

   

  With this system, HDTV playback is pretty good.  Not perfect, but very watchable.  The only time I noticed that my machine cannot keep up, is on *some* camera pans.  In those situation, I do get some *minor* pause/skip/pause/skip type studdering.

   

  I have XvMC disabled.  Enabling it results in very jurky playback of any OSD, and does not seem to improve the playback of the video.

   

  For those stations broadcasting in 1080i, enabling a deinterlacer is a must.  A deinterlacer, of course, make no difference for the 720p stations.

   

  Experimental A/V sync does not seem to make any difference for me.  I am using nVidia's 5336 driver, so maybe Experimental A/V sync does not work.

   

  Extra audio buffering is required to keep the sound from studdering.

   

  If I enable "use video as timebase", I do not get any audio, and the video looks like it is running at about 90% of full speed.  This would indicate to me that my machine cannot keep up with HD streams, and yet gkrellm never shows my CPU above 65%.  My system "load" and disk activity also remain low.  This all make me very curious as to why the HD stream cannot be played at full speed without any frame skipping.

   

  I am planning on eventually building a dedicated Myth frontend.  The reason for this survey is to help me decide what hardware to go with.  I am somewhat tempted to give an Athlon a try if someone can indicate how well they work with HD material.  Anyone tried an Athlon64?

   

  Thanks,

   

  John

   



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