Doom9's Forum - View Single Post - Blu-ray compliancy (x264): Number of B-frames?

Trahald · 26th March 2008, 19:31

you know what.. i did the math using the spec.. and i may be wrong.. but i get that 3 would be max... here is the math

Code:

min( 1024 * MaxDPB/(PicWidthInMbs * FrameHeightInMbs * 384), 16)
1024 * (11288) / (120 * (( 2 – frame_mbs_only_flag ) * PicHeightInMapUnits) * 384)
1024 * 11288 / (120 * (( 2 - 1 ) * 68 ) * 384 )
1024 * 11288 / (120 * ( 68 ) * 384 )
11558912 / (3133440)
3.688888888888
min(3.6888,16) = 3.368888

so 3 would be max (num ref frames / max dec frame buffering).. weird

26th March 2008, 19:31	#13 \| Link
Trahald Wewkiee Join Date: Feb 2002 Location: kashyyyk Posts: 2,269	you know what.. i did the math using the spec.. and i may be wrong.. but i get that 3 would be max... here is the math Code: min( 1024 * MaxDPB/(PicWidthInMbs * FrameHeightInMbs * 384), 16) 1024 * (11288) / (120 * (( 2 – frame_mbs_only_flag ) * PicHeightInMapUnits) * 384) 1024 * 11288 / (120 * (( 2 - 1 ) * 68 ) * 384 ) 1024 * 11288 / (120 * ( 68 ) * 384 ) 11558912 / (3133440) 3.688888888888 min(3.6888,16) = 3.368888 so 3 would be max (num ref frames / max dec frame buffering).. weird __________________ ...yeah...but...why on earth would I compare apples with apples?