[x265] Adaptove GoP sizes - not sure if its working

[Roshantha Mendis]

Xinyue,

I will also test the latest 1.8 on my movie clips (15mins each). With the
v1.7 i got all fixed length, sometimes fixed length-3 gops.
On 8 Oct 2015 17:15, "Xinyue Lu" <maillist at 7086.in> wrote:

> On Wed, Oct 7, 2015 at 12:47 PM, Steve Borho <steve at borho.org> wrote:
> > On 10/07, Xinyue Lu wrote:
> >
> > this blanket statement is incorrect. If the scene cut happens a large
> > distance from the max keyframe interval it is better to encode it as a P
> > to save bits. When you specify --keyint-max 250, the encoder will try to
> > only use one I frame per 250 frames, this is its goal.
>
> Yes, understand that, you are right.
>
> I haven't had a chance to test the latest version, maybe will do it in
> this weekend. In previous tests, it produced fixed length gop from the
> beginning to the end, all the way through half hour video clips, so
> that was certainly a bug.
>
> I'll also test with different rc-lookahead settings to see the impact
> of these patches.
>
> Thanks.
>
> >
> > If there are scene cuts near the max keyframe interval that are not
> > being set to I, then that could be a problem. The bias algorithm does
> > tend to detect many possible scene cuts near the end of the max interval
> > and this tends to trigger the flash detection logic (where you have many
> > scene cut frames in a row) which defers the I frame until the end of the
> > flash or max interval (see scenecut.cpp line 1450) It's not possible to
> > tell if this is happening in your case without seeing the input video.
> >
> > --
> > Steve Borho
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> > x265-devel at videolan.org
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