[mythtv-users] Playback Profiles? WTF?!

Glen Hawksworth glenhawk at optusnet.com.au
Fri Mar 21 02:42:09 UTC 2008


> Ok, so to check DMA you do as root:
> 
> hdparm /dev/hda
> 
Yeah found out about this but then found out that I am running UDMA

hdparm -i /dev/sda

> Replace hda with whatever drive your recordings are stored on. You won't 
> really need to check for DMA on the CF card, since your recordings won't 
> be on that one. There was another post earlier about resolution size. My 
> TV has a resolution of 1366x768. I'm using a 1280x768 modeline in X. I 
> also don't have a 1080p TV, so don't know whether processor usage would 
> go up at that resolution.

OK I will try sacrificing some resolution (this box will eventually be
connected to a 720 LCD when I get a new box for the 1080)

> But yes, ffmpeg does put most of the work on the processor.
> My graphics card has 256MB of RAM I believe; it's an Nvidia FX5200, AGP. 
> However, I don't think that you're going to need more RAM for HD 
> decoding and displaying at an HD resolution.
> 
Yeah I plugged in the 256 that I have (that doesn't fit in the case) and
I got more reliable performance. I am currently rebuilding with the 128
ATI and will sacrifice resolution (could't get the ATI to do 1080) to
see if 128 is enough.
It is just so frustrating that all was acceptable in 0.20 and I can't
emulate that with 0.21

> So what you're saying is you get stutter free HD with XVMC, and 
> stuttering every 3-4 seconds with ffmpeg? Is your sql database on a 
> separate drive from your recording? Some people have mentioned getting 
> stuttering due to heavy sql activity.
> 
My SQL database is on the OS drive of my backend machine (I am pretty
certain) and the recordings are on a separate 750GB drive (in the
backend obviously) that I scored from work. The 750 is an IDE but
running at ATA133 and all works fine watching TV from the backend (in
the study)

> Hope you're making some progress.
> Raphael

me too! I'll let you know the result soon.

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