Sticker pack does not work in Signal for Android but works in Signal for Desktop

[HyperCriSiS]

Hi,

• [x] I have searched open and closed issues for duplicates
• [x] I am submitting a bug report for existing functionality that does not work as intended
• [x] I have read https://github.com/signalapp/Signal-Android/wiki/Submitting-useful-bug-reports
• [x] This isn't a feature request or a discussion topic

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Bug description

Describe here the issue that you are experiencing.

Steps to reproduce

• Install Sticker pack https://signal.art/addstickers/#pack_id=884c5bc8e034763638038719004b53b6&pack_key=c33df578c4b68331cdefce3cef0b4ad3641ba91cbb9b45816ca82fd38097d20a

• Send a sticker

Actual result: The sticker is not visible. It is also not visible in the sticker picker. Expected result: The sticker should be visible in the sticker picker and when its sent

Screenshots

Device info

Device: Asus Zenfone 8 Android version: 11 Signal version: 6.38.2

Link to debug log

https://debuglogs.org/android/6.38.2/5be17188c748a9a5faf7c710c29cd5b567c6d3f1c2ccfeacb28501ce6faa5343

Thanks Hyper

[Perfectio07]

I would like to add in, this happens to me as well but with animated stickers. Even more specifically, stickers created from an Iphone.

Iphone users can see the sticker fine, but me (Asus Zenfone 9) and my friend (Samsung A54) see the sticker like the pictures above.

[clark-signal]

Thanks for the report! Do you know if this is recent?

[HyperCriSiS]

Thanks for the report! Do you know if this is recent?

My reported sticker pack still does not work on latest beta (6.41.2)

[Perfectio07]

Unfortunately it is not recent. I have had this issue for quite a while (about a year or so) just never got around to reporting it.

[laggykiller]

Because the sticker pack contains animated stickers in webp format. Animated stickers must be in apng format to playback on Android. See https://support.signal.org/hc/en-us/articles/360031836512-Stickers

Animated stickers must be a separate APNG file.

Shameless self-advertisement: You may use sticker-convert (https://github.com/laggykiller/sticker-convert) to convert the stickers to apng and reupload.

[Perfectio07]

So per the article, it must be apng, but animated webp works for Iphones and fails on Android? How weird. I would hope that if it works on one it works on the other albeit I don't really know if that could even be fixed.

Ill give the converter tool a try

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[Perfectio07]

This issue still remains. Im not sure if its the format or not, but it fails on Androids and is fine on Iphones.

[laggykiller]

@Perfectio07 This problem is addressed here: https://github.com/signalapp/Signal-Android/issues/13067#issuecomment-1961579210

[Perfectio07]

It still doesn't explain why webp renders fine on Iphones and not on Android. I could be wrong, but I am sure that Androids should be capable of rendering webp. If not, then I guess it is what it is.

[HyperCriSiS]

Stickers showing properly now. Issue solved, thank you 🙂

[HyperCriSiS]

ok I was wrong, the stickers are shown, but did not know they normally are animated. converting to apng solved it.