[FFmpeg-devel] [PATCH] avutil/motion_vector: export subpel motion information

[Clément Bœsch]

On Fri, Nov 20, 2015 at 10:33:04AM +0100, Clément Bœsch wrote:
[...]
> > i think this doesnt support libavcodec/tpeldsp.c as used in svq3
> > that would need a motion_xy / 3
> > 
> > i might be missing something but
> > 
> >  * Motion vector
> >  * src_x = dst_x + motion_x / motion_scale
> >  * src_y = dst_y + motion_y / motion_scale
> >  */
> > int32_t motion_x, motion_y;
> > uint8_t motion_scale;   // This is almost always a power of 2
> > 
> > should be enough to support all things
> > 
> 
> ok, so always a div then
> 
> > The "*motion_scale" should not be needed, the exportet vectors
> > can just be multiplied up if thats needed
> 
> what is the range of mv_scale in snow? how much precision i'm going to
> loose by doing avmv->motion_scale = mv_scale/8?
> 

ah wait my bad, forget this.

note: can't we make the motion_scale always a power of two by
pre-multiplying motion_[xy]?

-- 
Clément B.
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