[mythtvnz] Now we have DVB-T working in MythTV...

[Steven Ellis]

On 4/08/2008, at 12:04 AM, Paul Kendall wrote:

> On Monday 04 August 2008 18:02:32 Steven Ellis wrote:
>> On 3/08/2008, at 7:57 PM, Robin Gilks wrote:
>>> ...what would people recommended for a diskless highdef capable
>>> frontend?
>>>
>>> That's about it as far as questions go - do the 6100 series nvidia
>>> equipped motherboards (eg. a Gigabyte GA-M61PME-S2) have enough GPU
>>> grunt
>>> to handle the DVB-T H264 and the latest SD de-interlacers or should
>>> I be
>>> looking at a 8300 series integrated video solution (eg. Asus M3N-H/
>>> HDMI
>>> Motherboard).
>>>
>>> In either case, are there any small cases that won't break the bank
>>> (I'm
>>> planning on an external 12v brick with a 200w auto style PSU for
>>> cool and
>>> quiet!)
>>
>> I was talking to Keith Packard last week at OSCON about the joy of
>> trying to decode 1080i H.264 frames on Linux compared with Windows.
>> Basically for the next 6-12 months we need a damn fast CPU.
>>
>> Can anyone estimate the grunt required for full 1080i playback in AMD
>> and Intel CPU form?
>
> For an intel I use a 1.6GHz C2D and it occasionally stutters on 720p  
> and
> struggles with 1080i. So, I would go with a 2.2GHz for even 2.4

Thanks for the tips

>
>> For a combined frontend/backend solution I'm personally considering a
>> Tri or Quad cpu setup so that we have N-1 CPUs for the graphics  
>> decode
>> and a spare CPU for any backend housekeeping tasks.
>
> Using multicore is not really going to give any benefits with ffmpeg/ 
> MythTV yet
> as they only use that on sliced h264, which ours is not!
> So a Duo would be OK, but anything above that would be wasted.

Actually in my tests with mplayer it does scale across CPUs.

>
>> Next part is the capture device. My ideal would be the HVR2200 for  
>> DVB-
>> T but that isn't ready yet. Also the HVR 3000/4000 units aren't
>> mainstream either.
>
> Personally I would go with a Nova-T 500 and an HVR-4000 so I get 3  
> DVB-T
> tuners and a satellite.
>
>>
>> We definitely live in "interesting times".
>>
> I am keeping a close eye on this gsoc project
> (http://www.bitblit.org/gsoc/g3dvl/index.shtml) as he is working on  
> GPU
> accelerated decoding with GLSL (GL shader language), and it looks  
> promising.

Yes we discussed this at OSCON and it looks like it will be a real  
help. Sadly not something we are going to see in the shot term.

Steve

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

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