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: Wed, 23 Jul 2025 19:02:06 +0200
Message-ID: <aIEVjvmc3bpOP0Zr@phare.normalesup.org> (raw)
In-Reply-To: <20250723171838.GB1401694@haasn.xyz>
Niklas Haas (HE12025-07-23):
> [PATCH v2 05/18] avcodec/encode: enforce alpha mode compatibility at encode time
That handles it for encoders, I suppose. But I do not see anything
protecting you from stacking images with different kind of alpha or
sending this kind of frames to a muxer with uncoded frames.
Regards,
--
Nicolas George
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
To unsubscribe, visit link above, or email
ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
next prev parent reply other threads:[~2025-07-23 17:02 UTC|newest]
Thread overview: 31+ 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 [this message]
2025-07-24 11:11 ` Niklas Haas
2025-07-24 14:59 ` Nicolas George
2025-07-24 20:58 ` Niklas Haas
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=aIEVjvmc3bpOP0Zr@phare.normalesup.org \
--to=george@nsup.org \
--cc=ffmpeg-devel@ffmpeg.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Git Inbox Mirror of the ffmpeg-devel mailing list - see https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
This inbox may be cloned and mirrored by anyone:
git clone --mirror https://master.gitmailbox.com/ffmpegdev/0 ffmpegdev/git/0.git
# If you have public-inbox 1.1+ installed, you may
# initialize and index your mirror using the following commands:
public-inbox-init -V2 ffmpegdev ffmpegdev/ https://master.gitmailbox.com/ffmpegdev \
ffmpegdev@gitmailbox.com
public-inbox-index ffmpegdev
Example config snippet for mirrors.
AGPL code for this site: git clone https://public-inbox.org/public-inbox.git