[mythtvnz] CPU required for Freeview HD

[Hayden Lovett]

I have run my 5200+ using the patch with success on all channels and most of
the time on TV3.  Its still early days so I haven't had a dig around to see
why it sometimes works fine.  Be interested to hear from anybody else using
this CPU.

Hayden Lovett




2008/8/20 Steven Ellis <steven at openmedia.co.nz>

>
> On 20/08/2008, at 6:08 PM, Steven Ellis wrote:
>
>
> On 20/08/2008, at 4:45 PM, Robin Gilks wrote:
>
> The H264 decode flatlines all OSs if done in software due to the
>
> complexity of the decode when dealing with our broadcast streams.
>
>
> I've compared Linux and Mac software decode on the same hardware,
>
> EyeTV vs MPlayer, and they appear to use similar amounts of CPU.
>
>
> The best windows codec for software decode is CoreAVC which is a
>
> proprietary commercial codec.
>
>
> Until we get a way to accelerate some of the decode on the GPU we are
>
> going to lag behind Windows users who have hardware accelerated decode
>
> via the main graphics card vendors.
>
>
> As to STBs, as mentioned they have chips designed to accelerate the
>
> decode in hardware. If you have had a play with the Zinwell STB you
>
> would notice that it can get very hot due to the load.
>
>
> Steve
>
>
> So if all the work is done in the CPU, would a mother board such as the
> "Asus M2A-VM HDMI Motherboard" with an ATI embedded video controller do
> the job or is it still better to spend another $40 or so and use an nvidia
> based board such as the "Asus M3A78-EMH HDMI Motherboard".
>
>
>
> The pay off with the GPU will come in with the new Google Summer of Code
> projects to perform GPU based acceleration.
>
>
> c
> In either case, what would be the minimum spec CPU required (assuming
> these m/b will support the required speed that is!!) to handle both TV1
> and TV3 HD?
>
>
> I did a bunch of performance comparison tests on an X2 3600+ test rig
> today. I looked at the CPU load for both H.264 and MPEG 2 playback of the
> same channels, and locked the CPU to its max frequency of 2GHz.
>
> I also used the CPU++ profile and allocated a max of 2 cores to video
> decode. It appears that some of the frames are slice compatible so there is
> a benefit in enabling dual CPU, but until FFMPEG can do true multi cpu
> decode we really need a CPU fast enough to decode on a single core. This is
> a shame given the drop in price of triple and quad core processors
>
>
> Channel                    Resolution Load H.264 Load MPEG2
> freeview|HD              720p        95-100+
> TV One                           720p 98-108 11-15
> TV 2 720p 100+ 11-15
> TV 3 1080i 130+ 12-15
> C4 576i 45 13-15
> TVNZ 6 576i 26-35 9-10
> Sports Extra 576i 25-40 10-12
> Maori 576i 37-40 9-10
>
> Now the CPU load for C4 on freeview|HD is a little higher than the other
> channels, which might be explained by the higher bit rate they are using
> compared with TVNZ 6+7 etc.
>
> For SD it appears we need 3.5 - 4x the CPU of SD and the X2 3600+ copes
>
> For 720p the CPU is borderline and occasionally copes.
>
> For 1080i I'm well out of power.
>
> Right now I'd look at the fastest 65W processor I can buy. Sadly the only
> X2 5600s in the market are still 89W units, so it would be a 5400 which runs
> a 2.8 GHz. The question is will this be enough?
>
>
> Hmm it appears there are some 65W 5600 X2 processors around. Any chance
> some one on list has a 5400 or 5600 cpu that they can report on?
>
> Steve
>
> Steven Ellis - Technical Director
> OpenMedia Limited
> email   - steven at openmedia.co.nz
> website - http://www.openmedia.co.nz
>
>
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