[mythtvnz] CPU required for Freeview HD

[Steven Ellis]

On 23/08/2008, at 9:40 PM, graeme wrote:

> Ok I gave my aerial twitch  and can now get TV3
>
> cat /sys/devices/system/cpu/cpu1/cpufreq/scaling_cur_freq
> 2900000
> root at mercury-mythbox:/home/graeme# cat
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq 2900000
>
[ cut ]
>
> 40- 50% used, 74% idle is typical for 720p SD on TV1 - Advertisements
>
> Olympics 720p HD lowest is 60% typically sits around 75-85% used and  
> 60%
> idle
> highest spike 100% if large changes in screen content
>
> Crappy movie TV3  1080i CPU typically 103%  110% peak, 45 % idle - 1.5
> second play, .5 second pause recurring.
> Normal playback profile for deinterlacing used.
>
> I managed to get to watch a recording once then the frontend crashes
> came back
>
> 2008-08-23 21:11:13.861 [h264 @ 0xb7006230]number of reference frames
> exceeds max (probably corrupt input), discarding one
> 2008-08-23 21:11:13.861 [h264 @ 0xb7006230]number of reference frames
> exceeds max (probably corrupt input), discarding one
> 2008-08-23 21:11:13.862 [h264 @ 0xb7006230]number of reference frames
> exceeds max (probably corrupt input), discarding one
> 2008-08-23 21:11:13.912 [h264 @ 0xb7006230]mmco: unref short failure
> 2008-08-23 21:11:13.916 Video timing method: USleep with busy wait
> 2008-08-23 21:11:13.963 [h264 @ 0xb7006230]mmco: unref short failure
> Segmentation fault
>
> Changing to a lower screen resolution than 1920x1080 doesn't lower the
> CPU usage
>
> Transcoding either 720p or 1080i recordings to a more CPU friendly
> format fails.
>
> So it look like I'm going to join the source fiddlers club if I want  
> to
> watch TV3, one of them just had to choose 1080i !!
>
> Barring that FFMpeg and Mythtv needs to get more multi threaded or I'm
> screwed...
>
> Funny, 5 years ago I generally couldn't have cared less about TV3 but
> now most of what I watch is on it (sigh)
>
> Hope that helps Steve, gee, aren't you glad you didn't buy that 5600+
> ... :'(
> I have my doubts about any currently available AMD dual core being  
> able
> to take TV3 on ...
> A 3 Ghz  Intel Core 2 seems to be the way to go.
>

Thanks for that.. I think we might get by with skiploopfilter enabled  
and a couple of the other tweaks..

Otherwise we can hope for some new GSoC patches in the next month.

Steve


Steven Ellis - Technical Director
OpenMedia Limited
email   - steven at openmedia.co.nz
website - http://www.openmedia.co.nz

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