Re: [FFmpeg-devel] [PATCH] lavc/libx264: enable x4->params.analyse.b_fast_pskip if mb_info is set - Carotti, Elias via ffmpeg-devel

From: "Carotti, Elias via ffmpeg-devel" <ffmpeg-devel@ffmpeg.org>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Cc: "Carotti, Elias" <eliascrt@amazon.it>
Subject: Re: [FFmpeg-devel] [PATCH] lavc/libx264: enable x4->params.analyse.b_fast_pskip if mb_info is set
Date: Tue, 5 Sep 2023 12:43:35 +0000
Message-ID: <1875a1e78c2a49618256568ca30e2ac1@amazon.it> (raw)
In-Reply-To: <ZPNYfg9pZ6+SP9q4@mariano>

-----Original Message-----
From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of Stefano Sabatini
Sent: Saturday, September 2, 2023 5:45 PM
To: ffmpeg-devel@ffmpeg.org
Cc: kierank@obe.tv; Carotti, Elias <eliascrt@amazon.it>
Subject: RE: [EXTERNAL] [FFmpeg-devel] [PATCH] lavc/libx264: enable x4->params.analyse.b_fast_pskip if mb_info is set

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On date Saturday 2023-09-02 09:20:08 +0000, Carotti, Elias wrote:
> On Thu, 2023-08-31 at 19:09 +0200, Stefano Sabatini wrote:
> >
> <snip>
> >
> > > In particular why are you turning on fast_pskip silently based on 
> > > a completely different setting?
> >
> > The patch is fixing the regression introduced by the unconditional 
> > setting of b_fast_pskip.
> >
> > Now the question is if it makes sense to set mb_info without 
> > b_fast_pskip (in both case this should be probably documented).
> >
> > @Elias can you comment about the mb_info/b_fast_pskip use case?
>
> Sorry again for the delay in responding.
> We can safely remove it altogether. It's true we don't need to set it 
> along with mb_info.
> However, it doesn't do any harm, since fast_pskip is by default set to 
> true by libx264 and only turned off either explicitly by the user, or 
> when using the placebo preset, or when doing lossless encoding 
> (constant QP == 0.) So, I agree, let's remove these three lines.

Thanks, updated.

Ok for me
Elias

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