[x264-devel] Re: patch: switch to select ME method & range

[Måns Rullgård]

Tuukka Toivonen <tuukkat at ee.oulu.fi> writes:

> It also adds new motion estimation method, exhaustive search algorithm
> (ESA).
>
> With the patch, --subme no more selects between diamond/hexagonal
> integer pixel search as it used to be.
>
> I'm not sure if you find this patch useful, as ESA is not so
> celebrated algorithm... but this could make a base for easy
> experimenting of different ME methods. Also, ESA _does_ improve the
> encoding quality reducing bitrate at constant quality in average 4%
> [1], at low bitrates, making x264 pretty much on par with JM. It's
> just a bit slow.

Slower than JM?  That's, well... slow.

> Let me know what you think of it.
>
> [1] I tested it with 6 standard CIF sequences, largest reduction was
> 10% with Stefan, worst case was something like 0.5% bitrate increase
> with
> Mobile and calendar. I'm still running tests with larger videos.
> At lowest bitrate I used QP=36 where the largest savings were obtained.

IMHO, QP 36 is barely usable, except, possibly, if you need to
transfer video the size of a postage stamp from some cheap web-cam
over a 14.4 kbps modem link, and, for some inexplicable reason, are
satisfied with that.

-- 
Måns Rullgård
mru at inprovide.com

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