[x265] [PATCH STABLE] encoder: disable lookahead for all-intra encodes

[Jason Garrett-Glaser]

On Tue, Sep 24, 2013 at 11:28 PM, Steve Borho <steve at borho.org> wrote:
> # HG changeset patch
> # User Steve Borho <steve at borho.org>
> # Date 1380090499 18000
> #      Wed Sep 25 01:28:19 2013 -0500
> # Branch stable
> # Node ID 91ae57f62e18e447b217bbfe9f4d45f36dd19b03
> # Parent  ddb7abf83f983a5d5e1e0e79b57073d5bd9c8160
> encoder: disable lookahead for all-intra encodes
>
> This works around a bug in the current Lookahead::slicetypeDecide().  I have
> a patch in the works which fixes this properly, but I think this is a reasonable
> workaround (who needs lookahead or lowres structs for all-intra encodes)?

At least in x264, lookahead is used for AQ, VBV, and ratecontrol in
all-intra encodes.

Jason