[x264-devel] Re: Not using all pictures as reference

[Loren Merritt]

On Tue, 12 Sep 2006, Fredrik Olofsson wrote:

> Is it possible to configure x264 to not use all pictures as reference
> pircute? Like only using every other or every fourth picture as a
> reference picture?
>
> My application is streaming an encoded file over a network with (at
> encode time) unknown bandwidth. Therefore it would be useful to be able
> to change the stream's required bandwidth by dropping pictures that
> does not affect the state of the decoder. What I would like to achieve
> is sort of a "poor mans" bitrate-scalability.

Turn on B-frames. To force only 1 in 4 pictures to be referenced (as 
opposed to letting the encoder choose to maximize compression), use:
--bframes=3 --no-b-adapt

--Loren Merritt

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