From: Nicolas George <george@nsup.org>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Cc: tc@ffmpeg.org
Subject: Re: [FFmpeg-devel] The patch series about premultiplied alpha
Date: Sun, 3 Aug 2025 17:49:14 +0200
Message-ID: <aI-E-rlLSRjqDnJG@phare.normalesup.org> (raw)
In-Reply-To: <aI9zub51EcmdmYtx@phare.normalesup.org>
Nicolas George (HE12025-08-03):
> By the way, I am willing to put aside my reluctance of contributing with
> all the bullshit going on in order to help implementing this flag
> system. But I suspect it is so simple to implement that it is not worth
> it.
In fact, I have started doing it. I use the following test case:
-vf 'premultiply=inplace=1,drawbox=x=50:y=50:w=800:h=600:c=#808080:t=50,unpremultiply=inplace=1'
(on top of a png produced by testsrc2). Compare the grayness of the box
with the case where premultiply is not applied.
I will send the series here in a few hours.
Regards,
--
Nicolas George
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next prev parent reply other threads:[~2025-08-03 15:49 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-02 15:18 Nicolas George
2025-08-02 18:03 ` Nicolas George
2025-08-03 10:42 ` Niklas Haas
2025-08-03 10:50 ` Niklas Haas
2025-08-03 14:35 ` Nicolas George
2025-08-03 15:49 ` Nicolas George [this message]
2025-08-03 18:15 ` [FFmpeg-devel] [PATCH] lavfi: protection against premultiplied alpha (was: The patch series about premultiplied alpha) Nicolas George
2025-08-03 20:04 ` Michael Niedermayer
2025-08-03 20:50 ` Kacper Michajlow
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