File for stress testing PMS

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Re: File for stress testing PMS

Postby sync24 » Mon Feb 09, 2009 12:02 am

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Re: File for stress testing PMS

Postby Joksi » Mon Feb 09, 2009 12:10 am

sync24 wrote:You can also get them here:

http://www.microsoft.com/windows/window ... wcase.aspx


Thats VC1 material, not so good for actually stress testing.

H264 AVC should be used for this.
On my system there is about 20-25% higher load on the same video encoded in H264.
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Re: File for stress testing PMS

Postby Flow » Mon Feb 09, 2009 7:16 am

So this means VC1 bluray files are less detailed than AVC?
I think Im a bit confused, I'll do some reading on that since I just read your answers now but if you can explain that would be nice also!

Sorry for my misunderstanding about this Shagrath! Lack of knowledge on my part.
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Re: File for stress testing PMS

Postby Joksi » Mon Feb 09, 2009 7:25 am

Im not 100% sure.
I just think that the same material in H264 and in VC1, H264 is more CPU intensive.

I have a sample, the same one, in VC1 and H264. When playing it my CPU loads 100% on H264, but only 70% on the VC1
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Re: File for stress testing PMS

Postby ExSport » Mon Feb 09, 2009 10:49 am

Flow wrote:So this means VC1 bluray files are less detailed than AVC?

No.
When quality settings are the same for both, you can also use different codec parameters to achieve this.
When you use ref frames max 4 or 16, it doesn't mean that quality will be greater but that CPU have calculate more frames than when 4 used.
It means that file with more ref. frames can be smaller than same file with less ref frames. But then more CPU power is used.
Blu-Ray standart uses level 4.1, but some old rips uses level 5.1 specification which no HW decoder supports yet.
You can play movies in 1080p flawlessly with 4 ref frames, but other 1080p file can shutter when more ref frames used, cabac used, etc...
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