Levels

[juGGaKNot]

Hello, i read here

http://en.wikipedia.org/wiki/H.264#Levels

that level 4 is

1280x720@68.3 (9)
1920x1080@30.1 (4)

So i can go up to 60 FPS at 720P and 30 FPS at 1080P and not break DXVA ?

And level 5.1 is

1920x1080@120.5 (16)

1080P at 100-120 FPS no chance in hell for DXVA here right ?

What kind of PC can run this ?

[Esurnir]

http://forum.doom9.org/showthread.php?t=142407&page=3
this benchmark show that it is indeed possible to decode that fast. However most screen don't have as fast a refresh rate. However levels also determine the maximum bitrate in a video among other things

[mrkazador]

Here's how to calculate how many reference frames for L4.1:

8388608\(width x height)

8388608\(1280x720)
8388608\921600
=9 reference frames

[Esurnir]

Here's how to calculate how many reference frames for L4.1:

8388608\(width x height)

8388608\(1280x720)
8388608\921600
=9 reference frames

Put his newbie hat

Where does the 8388608 come from ?

[J_Darnley]

It looks like the DPB size / 1.5, so then it comes from the specification/standard. [EDIT] Yeah it is, 12288*1024/1.5 = 8388608

[juGGaKNot]

http://forum.doom9.org/showthread.php?t=142407&page=3
this benchmark show that it is indeed possible to decode that fast. However most screen don't have as fast a refresh rate. However levels also determine the maximum bitrate in a video among other things

thnx!!!