[XviD-devel] Re: qpel smearing/noise problem

[suxen_drol]

On Wed, 8 Jan 2003 00:23:45 +0100 "Michael Militzer" <michael@xvid.org> wrote:

> I see the following ways to solve the problem:
> 1) use xvid for decoding xvid content (encoder+decoder share same idct = no
> problems)
> 2) implement the 132 inter macroblocks limit and check if this helps
> 3) reread the iso specs. I remember a sentence similar to this one: "idct
> has to meet IEEE1180 requirements with the following modifications: ..." -
> so our idct might be IEEE compliant but is maybe not compatible to the
> mpeg-4 standard...
> 4) try to agree on one idct implementation between all the various mpeg-4
> decoders (impossible, but at least xvid and ffmpeg could agree on one common
> idct, maybe divx also)

okay.

should we provide a selectable idct? or is that overkill?

	- integer reference
	- optimized integer reference (mpeg2dec)
	- simple_c(ffmpeg)
	- simple_mmx(ffmpeg)
	- idct_mmx/xmm(mpeg2dec)

-- pete; life is like a box of ammo