[Ffmpeg-devel] [PATCH] Snow multiple reference frames

Oded Shimon ods15
Fri May 26 10:56:16 CEST 2006

On Fri, May 26, 2006 at 01:53:20AM -0700, Loren Merritt wrote:
> $subject.
> notes:
> * Reduces bitrate by anywhere from 0 to 15%. Very content dependent.
> * Doesn't modify mv prediction. It still takes a median of neighbors, 
> regardless of which ref they used.
> * Doesn't work very well at low bitrate or with 8x8 partitions. Maybe 
> I'm underestimating the cost of specifying refs, or maybe due to the 
> above prediction? (but an exact rangecoder cost didn't help either.)
> * Slow encoding. Does a naive search over all available refs. A possible 
> optimization that helped muchly in x264, would be to stop a motion search 
> after fullpel or halfpel if the residual so far is much worse than some 
> previously searched ref.

> +#define MAX_REF_FRAMES 8

Does this mean it stores the entire last 8 frames always? isn't this 
extremely memory intensive?

- ods15

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