From: Nicolas George <george@nsup.org>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] Again pre-multiplied alpha
Date: Mon, 28 Jul 2025 16:18:29 +0200
Message-ID: <aIeGtbYemy3IVu12@phare.normalesup.org> (raw)
In-Reply-To: <20250724225800.GB34906@haasn.xyz>
Niklas Haas (HE12025-07-24):
> On what component are you missing an error here?
Recently I wrote: “stacking images with different kind of alpha or
sending this kind of frames to a muxer with uncoded frames”
So: at least filters and muxers with uncoded frames. The protection must
of course go in the framework, not in individual components, that the
ABC of proper design.
And this is only what I can think of right away. Every place that uses
the alpha component for anything other than copying must be protected.
Regards,
--
Nicolas George
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next prev parent reply other threads:[~2025-07-28 14:18 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-23 13:47 [FFmpeg-devel] (no subject) Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 01/18] avutil/frame: add AVFrame.alpha_mode Niklas Haas
2025-07-23 16:00 ` Kacper Michajlow
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 02/18] fftools/ffprobe: add support for AVFrame.alpha_mode Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 03/18] avfilter/vf_showinfo: print alpha mode when relevant Niklas Haas
2025-07-23 16:11 ` Kacper Michajlow
2025-07-24 11:19 ` Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 04/18] avcodec/avcodec: add AVCodecContext.alpha_mode Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 05/18] avcodec/encode: enforce alpha mode compatibility at encode time Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 06/18] avcodec/png: set correct alpha mode Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 07/18] avcodec/exr: " Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 08/18] avcodec/libjxl: " Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 09/18] avcodec/libjxlenc: also attach extra channel info Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 10/18] avcodec/jpegxl: parse and signal correct alpha mode Niklas Haas
2025-07-23 16:19 ` Kacper Michajlow
2025-07-24 11:13 ` Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 11/18] avfilter/vf_scale: don't ignore incoming chroma location Niklas Haas
2025-07-24 11:16 ` Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 12/18] fftools/ffmpeg_enc: don't ignore user selected " Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 13/18] fftools/ffmpeg_enc: forward frame alpha mode to encoder Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 14/18] avfilter/vf_premultiply: tag correct alpha mode on result Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 15/18] avfilter/vf_alphamerge: tag correct alpha mode Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 16/18] avfilter/vf_overlay: respect alpha mode tagging by default Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 17/18] avfilter/vf_setparams: add alpha_mode parameter Niklas Haas
2025-07-23 13:47 ` [FFmpeg-devel] [PATCH v2 18/18] avfilter/vf_libplacebo: add an alpha_mode setting Niklas Haas
2025-07-23 14:11 ` [FFmpeg-devel] Again pre-multiplied alpha Nicolas George
2025-07-23 15:18 ` Niklas Haas
2025-07-23 17:02 ` Nicolas George
2025-07-24 11:11 ` Niklas Haas
2025-07-24 14:59 ` Nicolas George
2025-07-24 20:58 ` Niklas Haas
2025-07-28 14:18 ` Nicolas George [this message]
2025-07-29 8:55 ` Niklas Haas
2025-07-28 0:00 ` Michael Niedermayer
2025-07-28 14:15 ` Nicolas George
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