[Feature request] Animated PNG (APNG) support

[Rongronggg9]

In a comparison made between GIF, APNG and WebP, it was shown that APNG kept lower file size while keeping at least equal quality.
Wikipedia

Some animated stickers are distributed in APNG format instead of GIF (e.g. Line sticker), but this GUI could only recognize and process them as normal PNGs. I've noticed that both ffmpeg and ImageMagick (>=7.0.10-31) support APNG, which means that pre-processing and post-processing APNG in the similar way to GIF may be feasible.

[AaronFeng753]

ImageMagick (>=7.0.10-31) support APNG

ImageMagick barely supports APNG, but I found other tools by this guy: https://sourceforge.net/u/maxst/profile/

[AaronFeng753]

APNG support will be available in the next update
✅ 43eb050

[Rongronggg9]

APNG support will be available in the next update
✅ 43eb050

That's awesome!

[AaronFeng753]

Now it's available in the latest BETA version 🎉

Support this project on patreon:
https://www.patreon.com/aaronfeng

[Rongronggg9]

It may wrongly insist that there are twice as many frames than what the APNG actually has.

For example, 377520094@2x.png is an APNG with 20 frames and will be splitted to 20 PNGs after starting processing (that's right). However, W2xEX will insist that the APNG has 40 frames. Once the first 20 PNGs are poccessed, it will try to process the last 20 PNGs, which do not exist, only to fail.
Renaming the extension to apng will not make any difference.

[AaronFeng753]

It may wrongly insist that there are twice as many frames than what the APNG actually has.

I download that image but I can't recreate this bug, this might be caused by GUI failed to delete .txt files generated by the disassembler. Could you check the splitFrames folder? And send me the full path of the splitFrames folder. @Rongronggg9

[AaronFeng753]

I tried several times but I still can't recreate this bug, but I found another one: e760d10

[Rongronggg9]

Hmm... I did more tests and found it only occurs when choosing waifu2x-ncnn-vulkan as the engine. Path or detailed settings seem to be irrelevant.

this might be caused by GUI failed to delete .txt files generated by the disassembler. Could you check the splitFrames folder?

No .txt in the splitFrames folder.

Could you check the splitFrames folder?

And send me the full path of the splitFrames folder.

I've tried to place the image to different folders only to get the same result. Here's the full paths to splitFrames folders:

C:\Users\Rongrong\OneDrive\Sticker\Capoo\貓貓蟲-咖波 好運發大財 賀年貼圖\animation@2x\377520094@2x_png_splitFramesFolder_W2xEX
C:\Users\Rongrong\OneDrive\Sticker\Capoo\2x\animated\377520094@2x_png_splitFramesFolder_W2xEX
C:\Users\Rongrong\377520094@2x_png_splitFramesFolder_W2xEX

[AaronFeng753]

only occurs when choosing waifu2x-ncnn-vulkan as the engine

Okay, now I know what happened, you are using waifu2x-ncnn-vulkan engine and the Scale Ratio is 4x, so the engine need to process those frames 2 times to make it 4x larger, that's why current file progress shows 20/40, which means it just finished the first round(make the images 2x larger)

And the text box at the bottom is keep saying automatic retry, that means the engine is crashing and the GUI is trying to start it again.

In conclusion, you don't have enough VRAM or RAM, so the engine can't enlarge those images to 4x, this was not caused by any bug in the GUI, I just tested it and everything works just fine on my PC.

Just try another engine or change the engines settings.

[AaronFeng753]

Please create new issues if you found another bug or have other suggestions