Hi Krishna,
I did some experiments on a Pentium 4 at 3 GHz with libmpeg2 0.4.1, using
some MPEG-2 video streams I had lying around of various resolutions. Here
are the results:
Luminance resolution -- speed
720x480 -- 319 fps
1280x720 -- 124 fps
1280x720 -- 135 fps
1920x1088 -- 98 fps
1920x1088 -- 86 fps
If we take "frame size" to mean "total luminance samples," then we get
these data:
Luminance resolution -- milliseconds per frame
345600 3.1
921600 8.1
921600 7.4
2088960 10.2
2088960 11.6
For these data, I get an R^2 value (a test of linearity) of 0.87. Where 1
is a perfect correlation (linear relationship) and 0 is no correlation.
So, I would say it's basically 87% linear. Not perfect, not always true,
but a good approximation.
Best,
Keith
On Fri, 29 Feb 2008, Krishna Prasad wrote:
> Hello Keith
>
> Thanks for your reply. I will have a look through it.
>
> Many of the paper references state that the decoding time varies linearly
> with the Frame Size. Does the policy holds good always?
>
> Can I get your feedback on this particular question?.
>
> Regards
> Krishna Prasad
>
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