bug#54848: 29.0.50; Emacs doesn't understand certain animated GIFs

[Stephen Berman]

On Mon, 11 Apr 2022 11:26:51 +0200 Lars Ingebrigtsen <larsi@gnus.org> wrote:

> With the following gif:
>
> https://quimby.gnus.org/s/CoolZanyHuman-max-1mb.gif
>
> Emacs reports "Error reading GIF data" and then displays a black box.
> ImageMagick, Firefox and feh are all able to display it, so it's either
> a giflib error or we're calling the functions wrong from Emacs.
>
>
>
> In GNU Emacs 29.0.50 (build 8, x86_64-pc-linux-gnu, GTK+ Version 3.24.33,
> cairo version 1.16.0)
>  of 2022-04-10 built on xo
> Repository revision: 02b521ad7456ae6834b0399ec80f56ee8ca09522
> Repository branch: master
> Windowing system distributor 'The X.Org Foundation', version 11.0.12101003
> System Description: Debian GNU/Linux bookworm/sid

When I visit that URL with EWW, the GIF displays the same as in Firefox.

This is in GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
3.24.33, cairo version 1.17.6) of 2022-04-10 built on strobelfs2
Repository revision: 48cb9c4aaadfe7bd50c13f658a6e8e9e97587867
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101003
System Description: Linux From Scratch r11.0-165

Configured using:
 'configure --with-xinput2 --with-xwidgets 'CFLAGS=-Og -g3'
 PKG_CONFIG_PATH=/opt/qt5/lib/pkgconfig'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XDBE XIM
XINPUT2 XPM XWIDGETS GTK3 ZLIB

Steve Berman