[x264-devel] out-of-range motion vectors

[CAdevel]

Thanx for your response,

The standard allows large motion vectors indeed (I recall a quarter window
as max). However, motion estimation techniques generally limit their search
range to 16 (or something close to that). Anyway, I encoded the movies with
x264 using the option "--hex --merange 24" and "--esa --merange 16", where
'merange' sets the motion estimation search range. Thus, in principle I
should not find any motion vector larger than 24 and 16 respectively. But I
think I did, and that worries me.

with kind regards,
Cor


2007/7/31, Panagiotis Issaris <takis.issaris at uhasselt.be>:
>
> Hi,
>
> CAdevel schreef:
> >[...]
> > THE QUESTION:
> >
> > Why does x264 create this large motion vectors? Is something wrong, or
> > do I misunderstand something? Do I interpret the motion vectors
> > correctly (even the reference encoder seems to produce vector too
> large)?
> >
> > I woudl really appreciate if someone could help me out on this.
>
> If I recall correctly, the H.264 spec allows motion vectors to be up to
> 2048 pixels in horizontal direction and 512 pixels in vertical direction.
>
> With friendly regards,
> Takis
> --
> vCard: http://issaris.org/pi.vcf
> PGP key: http://issaris.org/pi.key
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