Re: Animated GIF bootsplash: Failure to decode ImageMagick generated GIFs (invalid GIF signature)

[Paul Menzel]

Dear Michael,

Am 23.08.22 um 16:30 schrieb Michael Bacarella:
> On Tue, Aug 23, 2022 at 12:06 AM Paul Menzel wrote:
> > Am 22.08.22 um 21:23 schrieb Michael Bacarella:
> > > On Sat, Aug 20, 2022 at 11:45 PM Paul Menzel  wrote:
> > > > Thank you for implementing this. If you send a patch, I can test on real
> > > > hardware.
> >
> > […]
> > > Patch attached. I replied here rather than with a new email with a PATCH subject
> > > because I don't consider it ready to merge, more like a POC.
> > >
> > > Also I'm using gmail, hope I don't embarrass myself.
> >
> > Unfortunately, Gmail wraps lines after 72(?) characters so the diff is
> > malformed. Maybe attach the file generated by `git format-patch -1`?
>
> My apologies. Attached here.

I noticed another thing, that GIFs created by ImageMagick’s convert 
cannot be decoded. With your converted example image [1]

$ dpkg -l imagemagick
     […]
     ii  imagemagick    8:6.9.11.60+dfsg-1.3+b3 amd64        image 
manipulation programs -- binaries
     $ convert bootsplash.gif -resize 1280x1024+32 bootsplash2.gif
     $ identify bootsplash2.gif
     bootsplash2.gif[0] GIF 1280x960 1280x960+0+0 8-bit sRGB 256c 0.000u 
0:00.001
     bootsplash2.gif[1] GIF 1280x960 1280x960+0+0 8-bit sRGB 256c 0.000u 
0:00.000
     bootsplash2.gif[2] GIF 1280x960 1280x960+0+0 8-bit sRGB 256c 
2.05915MiB 0.000u 0:00.000

or bb.gif [2]

$ identify bb.gif
     bb.gif[0] GIF 100x100 100x100+0+0 8-bit sRGB 2c 0.000u 0:00.000
     bb.gif[1] GIF 100x100 100x100+0+0 8-bit sRGB 2c 0.000u 0:00.000
     bb.gif[2] GIF 100x100 100x100+0+0 8-bit sRGB 2c 0.000u 0:00.000
     bb.gif[3] GIF 100x100 100x100+0+0 8-bit sRGB 2c 0.000u 0:00.000
     bb.gif[4] GIF 100x100 100x100+0+0 8-bit sRGB 2c 0.000u 0:00.000
     bb.gif[5] GIF 100x100 100x100+0+0 8-bit sRGB 2c 0.000u 0:00.000
     bb.gif[6] GIF 100x100 100x100+0+0 8-bit sRGB 2c 0.000u 0:00.000
     bb.gif[7] GIF 100x100 100x100+0+0 8-bit sRGB 2c 1446B 0.000u 0:00.000

I get:

Decoding bootsplash.gif
     invalid GIF signature
     gif_decode failed with return code -1...

Kind regards,

Paul

[1]: https://michael.bacarella.com/bootsplash.gif
[2]: https://www.opensourcecook.in/sites/default/files/bb.gif