[x264-devel] Patch open gop

[Jason Garrett-Glaser]

On Mon, Aug 31, 2009 at 10:59 PM, Trahald<wewk584 at gmail.com> wrote:
> Ok attached patch has strict dpb built in (not an option) and also makes
> sure no pframes reference bframes (brefs are removed by the first P/i after
> the B/b frames (coded order)
> for your consideration..
>
> On Mon, Aug 31, 2009 at 7:26 PM, Jason Garrett-Glaser
> <darkshikari at gmail.com> wrote:
>>
>> On Mon, Aug 31, 2009 at 9:35 AM, Trahald<wewk584 at gmail.com> wrote:
>> >
>> >
>> > On Mon, Aug 31, 2009 at 12:30 PM, Trahald <wewk584 at gmail.com> wrote:
>> >>
>> >> Ok.. here is another version. patchable as of 1235.  Again it adds open
>> >> gop and a --strict-dpb( only does anything when b-pyramid is on) option
>> >> that
>> >> allows for ref 4 w/ 1080p . both options use mmco.
>>
>> Can you send a patch which just adds MMCO b-pyramid?  With strictdpb
>> on by default (forced on, no option), I don't want x264 violating the
>> spec.
>>
>> I'd like to get this in quickly, which means the way to do this
>> fastest is to split it into subcomponents which can be most easily
>> committed.
>>
>> Dark Shikari
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>
>
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>
>

OK, I did a lot of analysis using this yesterday (and I wrote part of
b-pyramid mbtree), and testing seems to show that keeping B-refs is
better than throwing them away because lower-quality refs that are
close temporally are better than high-quality refs which are far away
temporally.

This means that the "strict heirarchical" structure you've set up is
suboptimal quality-wise, but of course some things require it (e.g.
Blu-ray).

What would I need to do to make this strict heirarchicalness optional,
i.e. still abide by DPB in all cases, but make the default B-pyramid
work as before (except spec-compliant) and have an extra option to
make it strictly heirarchical for Blu-ray?

Dark Shikari