better error message for failed encoding of 'Optimized' GIFs #3134
Description
Describe the bug
On some GIFs, cjxl fails with "Getting pixel data failed."
Using "Coalesce" on https://ezgif.com/optimize allows the same GIF to then be read by cjxl
To Reproduce
cjxl -d 0 Optimized.gif Optimized.jxl
cjxl -d 0 Un-optimized.gif Un-optimized.jxl
Environment
- OS: Windows
- CPU type: x86_64
- cjxl/djxl version string: JPEG XL encoder v0.9.1 b8ceae3 [AVX2,SSE4,SSSE3,SSE2]
Original GIF
Un-optimized GIF