[MEncoder-users] x264 encoding slower after updating libx264

[Loren Merritt]

On Sat, 14 Nov 2009, Christian Ebert wrote:
>
> weightp is set to 2 by default:
>
> $ x264 --fullhelp | grep -A 2 weightp
>      --weightp               Weighted prediction for P-frames [2]
>                              - 0: Disabled
>                              - 1: Blind offset
>
> This adds 2 reference frames, so for converted files to play on
> iPod one has to set weightp=0. I found out the hard way ;-)

You may be right that iPod doesn't support weightp (I don't keep track of 
hardware decoders). But it's not because of the number of refs. Weightp 
adds 2 entries to the ref list, but they aren't extra frames, so they 
don't count against the DPB limit.

--Loren Merritt