[mythtv-users] AppleTV with Linux

[Peter Loron]

On Feb 19, 2008, at 6:19 PM, Scott D. Davilla wrote:

>> Figuring out the hang and video corruption issue during xvmc decode
>> are the biggest issues right now. Once I solve those, all the other
>> issues are trivial. Testing the various changes takes a lot of time
>> as the two issues are random and might take several hours to occur.
>> For example, I made a change last night and run 4 hours straight
>> before I got a hang. Before going to bed, I made another change (send
>> audio to /dev/null) and it was hung again in the morning but a
>> difference type of hang, I could escape back to the main menu. There
>> are many variables in play.
>>
>
> Just a quick report, I switched to mplayer to simplify debugging the
> xvmc hang/video corruption and I'm happy to say that after much
> investigation, I think I might have it solved.
>
> So far, mplayer has been running continuously for over 12 hours doing
> xvmc 1080i mpeg2 decode from a HDHomeRun. Not a sign of any glitches.
>
> The trick seems to be underclocking the nvidia gpu. The "standard"
> clocks reported by nvidia-settings is gpu = 360Mhz and vram = 720MHz.
> I'm running at gpu at 200MHz and vram at 800MHz. Interestingly, the
> vram speed effects xvmc decode performance more than gpu speed.
>
> I have to backout of some kernel config changes and patches and
> retest under myth to be sure but I've never seen 1080i xvmc run this
> long without glitching.


Awesome news, Scott! My ATV should arrive tomorrow. Looking forward to  
having a nice little HD-capable front-end. Thanks!

-Pete