[x264-devel] x264 Intra prediction mode

[eloise vidal]

Ok, thank you for your prompt response.

Eloïse


2012/12/10 Jason Garrett-Glaser <jason at x264.com>

> On Mon, Dec 10, 2012 at 7:22 AM, eloise vidal <eloise.vidal at gmail.com>
> wrote:
> > Hi,
> > I have a question about the Intra modes used by x264.
> > I noticed that 3 modes are used in addition to the standardized modes (4
> > modes(fashions) for blocks 16x16 and 9 modes(fashions) for blocks 4x4):
> > DC_LEFT, DC_TOP and DC_128.
> >
> > Are these three modes specific to x264? And if it is the case, how the
> > encoded stream can be in accordance with the standard H.264?
>
> There are 4 possible DC modes in progressive H.264; which one is
> selected depends on the availability of neighbors to predict from.
> x264 separates them for reasons of simplicity, the spec doesn't, but
> the result is equivalent.
>
> Jason
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