[mythtv-users] More HD stuttering

Curtis Stanford curtis at stanfordcomputing.com
Thu Dec 1 13:03:57 EST 2005

On Dec 1, 2005, at 10:53 AM, Jean Connelly wrote:

> Regarding:
>       The system is a 3.06 GHz P4 running Fedora Core 3.  The video  
> Card
> is a NVidia 5200FX.  For capture, all I have is a HD3000.  I've  
> checked
> that DMA is working on all the drives.  I built mythtv from stable
> source, 0.18.1.  I used the following configure options:
> --enable-xvmc --enable-opengl-vsync --enable-dvb
> --dvb-path=/lib/modules/2.6.12- 1.1381_FC3smp/build/include
> --disable-firewire --disable-joystick --disable-ivtv --enable-proc-opt
> --disable-xvmc-vld --enable-opengl-vsync
> I have close to an identical system; and I have what is probably  
> equivalent stuttering.  HDTV (live or recorded) is totally  
> unplayable in myth.  I have tried with and without opengl sync.  I  
> can't find the xvmc option in the gui with this myth version to  
> disable xvmc for testing.  Recorded 1080i plays badly (with  
> frequent pauses and never with audio sync) in mplayer with xvmc and  
> ffmpeg12mc and plays even worse without xvmc.  I'll try transcoding  
> my latest sample clips to see if they are fine when played back at  
> standard resolutions.
> I've got
> 3.06 GHz P4 (which is a 533Mhz FSB chip)
> 512 MB Ram
> BE7-RAID mobo
> Nvidia 5200FX
> Fedora Core 3
> Night before last's myth svn.  No deinterlacing requested.
> Prebuffer pauses all over the place.
> I think what we really need is an hdtv playback test suite external  
> to myth to get better benchmarks on actual system performance.   
> From previous posts to the list ("well I got *my* P4 1.4Ghz system  
> to playback hdtv") I think that my system *should* be able to  
> playback hdtv without issue, but perhaps there are some motherboard  
> weaknesses or such that make it impossible.
> Very frustrating.
> Thanks!
> Jean

HD plays well on my 2.4GHz P4/5200FX without XVMC. XVMC doesn't work  
well with HD. I get stuttering with XVMC and HD. I am not using  
OpenGL sync. The option for XVMC is the first screen of the TV  
Settings->Playback menu (from memory...)


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