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

[Fredrik Olofsson]

On Tuesday, September 12, 2006 at 16:01:04 -0700, Loren Merritt wrote:
> 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

When doing this, in combination with --ref 1, which picture will be used
as reference? Will it be the previous I or P picture in display order? Or
will there be some kind of reordering?

Thanks again
/Fredrik

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