0.99.0: Some animated PNGs fail to open
Posted: Fri Sep 17, 2021 3:27 am
XnView MP 0.99.0 (64 bit)
OS: Windows 10 (64 bit)
Certain types of animated PNGs, specifically those with transparent pixels and those optimized with apngopt fail to open when they previously opened on XnView MP 0.98.4.
This can easily be reproduced by converting an animated GIF to an animated PNG using ffmpeg, or optimizing an existing animated PNG using apngopt.
To reproduce: Create an animated PNG using one of these methods, and open it with XnView MP 0.99.0.
This will output a file that opens on XnView MP 0.99.0, but transparency is lost:
This will output a file that fails to open on XnView MP 0.99.0:
This will output a file that fails to open on XnView MP 0.99.0, regardless of whether the image has transparent pixels or not:
All of the files output from these programs should open fine, but most instead display a prompt which reads "File cannot be loaded!"
OS: Windows 10 (64 bit)
Certain types of animated PNGs, specifically those with transparent pixels and those optimized with apngopt fail to open when they previously opened on XnView MP 0.98.4.
This can easily be reproduced by converting an animated GIF to an animated PNG using ffmpeg, or optimizing an existing animated PNG using apngopt.
To reproduce: Create an animated PNG using one of these methods, and open it with XnView MP 0.99.0.
This will output a file that opens on XnView MP 0.99.0, but transparency is lost:
Code: Select all
ffmpeg -i animated.gif -f apng -filter_complex "[0:v] split [a][b];[a] palettegen [p];[b][p] paletteuse" animated.pngCode: Select all
ffmpeg -i animated.gif -f apng -filter_complex "[0:v] split [a][b];[a] palettegen=reserve_transparent=on [p];[b][p] paletteuse" animated.pngCode: Select all
apngopt -z2 -i15 animated.png animated_opt.png
Thanks to your detailed description I can reproduce