[mythtvnz] freeview HD on an AMD X2 6000+

Sun Oct 19 06:33:42 BST 2008

On 19/10/2008, at 11:50 AM, Andrew Richards wrote:

> I am now running this same set-up on my 5200X2, haven't done a through
> test but in simple terms I can play TV3.
>
> Well, at least I can while nothing else is happening. Unfortunately
> playback and commskip cannot co-exists without stuttering.  What I am
> trying to figure out is:
>
> - How to select audio streams? I want to use AAC on TV3 all the time,
> yet cannot see where to change this
> - How to turn off Loopfilter. In Playback Profiles I leave it on CPU+
> and edit the second entry (if rez <=1280 720 & > 720 576 ->XvMC) to  
> use
> 2 CPU's and uncheck the Loopfilter box. I also changed the Primary
> Deinterlacer to One Feild. I assumed all this would lower CPU usage  
> but
> it doesn't.
>
> Also I am confused about the Loopfilter box, my reading of the
> instruction is that with it checked, Loopfilter is enabled. This is  
> the
> default setting, yet by default my machine can play 1080i video  
> which I
> wouldn't expect without skiploopfilter. So it seems to be this setting
> isn't being properly respected. Any thoughts?

The bitrate and CPU load required for TV3 appears to vary quite a bit  
depending on the content. For testing the best bet is to record a show  
that is marked as broadcast in HD so you have a reliable reproducible  
environment.

Based on the CPU loading i'm seeing on a 6000+ and similar data for a  
5600+ I'm surprised you get the playback you are seeing. What MB and  
GPU do you have?

>
>
> Steven Ellis wrote:
>>
>> On 14/10/2008, at 10:35 AM, Steven Ellis wrote:
>>
>>>
>>> My X2 6000+ was delivered just an hour or so ago and now have  
>>> working
>>> TV3 - subject to a couple of minor niggles below.
>>>
>>> I'm running Ubuntu 8.04 with Paul's most recent patched MythTV
>>> release and loopfilter disabled in my playback profile. The
>>> motherboard is an M2NPV-VM with 2G Ram and a Hauppauge HVR-900 USB  
>>> tuner.
>>>
>>> Previously I had an X2 3600+ in my test rig which really didn't  
>>> cut it.
>>>
>>> X2 3600+
>>> cat /sys/devices/system/cpu/cpu0/cpufreq/ 
>>> scaling_available_frequencies
>>> 2000000 1800000 1000000
>>>
>>> X2 6000+
>>> cat /sys/devices/system/cpu/cpu0/cpufreq/ 
>>> scaling_available_frequencies
>>> 3100000 3000000 2800000 2600000 2400000 2200000 2000000 1800000  
>>> 1000000
>>>
>>> Ok so a lot more speeds to play with but for the purposes of testing
>>> I changed the governor to performance which locks the CPU at its
>>> fastest speed.
>>>
>>> echo "performance" >
>>> /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
>>>
>>> So First a bunch of pre-recorded content
>>>
>>> Channel CPU CPU with Bob
>>> TV3 83% 100+
>>> TV2 50% 50%
>>> TV One 50% 50%
>>>
>>> Live content
>>>
>>> Channel CPU CPU with Bob
>>> TV3 83% 100+
>>> TV One 59% 59%
>>> CTV8 21% 25%
>>> TVNZ 6 21% 24%
>>>
>>> So it appears that the Bob de-interlacer adds quite a bit of
>>> additional load, but thankfully most of that appears to be on the
>>> second core. For TV3 above I get 88% on one core and 29% on the
>>> second core with Bob. Without a de-interlacer almost all the load is
>>> on one cpu.
>>>
>>> There doesn't appear to be much of a performance difference between
>>> playing AC3 or AAC on TV 3 which is good news.
>>>
>>> So the niggles
>>> 1. The X2 6000+ is a 89W CPU part so the core is hotter and the fan
>>> faster than I'd prefer. There are rumours of some lower power parts,
>>> but they might only work in AM2+ compatible boards.
>>>
>>> 2. Occasionally I get a picture in picture effect when I switch
>>> between 720p and 1080i channels which I have two copies of the same
>>> video feed on screen, one of which is in a small box in the top left
>>> hand of the screen.
>>>
>>> 3. The AAC audio doesn't always lock on a channel change
>>>
>>> So I have something that works, but I wouldn't consider it customer
>>> ready.
>>>
>>> I think I need to consider an Intel compatible alternative, but  
>>> can't
>>> find a board with integrated Composite/Component/SVideo as well as
>>> DVI/HDMI in the Intel space.
>>>
>>
>> Turned CPU scaling back on which is rather interesting
>>
>> For 720p channels it is happy to peg the cpu at 1.8 GHz, for  1080i  
>> it
>> goes all the way upto 3.1 GHz.. The SD channels go all the way down  
>> to
>> 1GHz which is the lowest speed setting.
>>
>> Going to leave the box playing TV3 for a couple of hours and see how
>> it copes with the load.
>>
>> Steve
>>
>>
>> Steven Ellis - Technical Director
>> OpenMedia Limited
>> email   - steven at openmedia.co.nz <mailto:steven at openmedia.co.nz>
>> website - http://www.openmedia.co.nz <http://www.openmedia.co.nz/>
>>
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>>
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>
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Steven Ellis - Technical Director
OpenMedia Limited
email   - steven at openmedia.co.nz
website - http://www.openmedia.co.nz

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