From: Leo Izen <leo.izen@gmail.com>
To: FFmpeg Development <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH] avcodec/pnm: avoid mirroring PFM images vertically
Date: Tue, 22 Nov 2022 11:46:13 -0500
Message-ID: <38e46d11-ea49-4818-a58c-2e766bb143e2@gmail.com> (raw)
In-Reply-To: <20221116114306.251999-1-leo.izen@gmail.com>
On 11/16/22 06:43, Leo Izen wrote:
> PFM (aka Portable FloatMap) encodes its scanlines from bottom-to-top,
> not from top-to-bottom, unlike other NetPBM formats. Without this
> patch, FFmpeg ignores this exception and decodes/encodes PFM images
> mirrored vertically from their proper orientation.
>
> For reference, see the NetPBM tool pfmtopam, which encodes a .pam
> from a .pfm, using the correct orientation (and which FFmpeg reads
> correctly). Also compare ffplay to magick display, which shows the
> correct orientation as well.
>
> See: http://www.pauldebevec.com/Research/HDR/PFM/ and see:
> https://netpbm.sourceforge.net/doc/pfm.html for descriptions of this
> image format.
>
> Signed-off-by: Leo Izen <leo.izen@gmail.com>
Bumping for review, thanks.
- Leo Izen
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next prev parent reply other threads:[~2022-11-22 16:46 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-16 11:43 Leo Izen
2022-11-22 16:46 ` Leo Izen [this message]
2022-11-28 9:11 ` Leo Izen
2022-11-29 11:14 ` Anton Khirnov
2022-12-14 20:13 ` Leo Izen
2022-12-27 13:38 ` Leo Izen
2022-12-27 13:42 ` James Almer
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