Better animated thumbs #65

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opened 2025-01-27 16:17:08 -06:00 by Zankaria · 4 comments

Zankaria commented

2025-01-27 16:17:08 -06:00

(Migrated from gitlab.leftypol.org)

Right now, the thumb_keep_animation_frames limits the maximum number of frames in the previews and requires the the thumb_ext option to be set to empty or gif, which is undesirable since we want our previews to be in the small webp.
An extra thumb_animated_ext option or something similar to generate animated previews in a desired format needs to be added. webm is preferable to gif due to it's better compression, but I am not sure if the browser treats them like an image. Investigation is required

Right now, the `thumb_keep_animation_frames` limits the maximum number of frames in the previews and requires the the `thumb_ext` option to be set to empty or `gif`, which is undesirable since we want our previews to be in the small `webp`. An extra `thumb_animated_ext` option or something similar to generate animated previews in a desired format needs to be added. `webm` is preferable to `gif` due to it's better compression, but I am not sure if the browser treats them like an image. Investigation is required

IFA commented

2025-02-09 12:30:51 -06:00

(Migrated from gitlab.leftypol.org)

Investigation is required

animated webps exist and are supported by major browsers. using a webm would turn the thumb into a video element, undesired

converting a user gif into a thumbnail can be done like this (imagemagick 6.9.11)

convert original.gif -coalesce -filter Lanczos -resize "255x255>" -deconstruct miff:- | convert miff:- -define webp:method=6 -quality 50 thumb.webp

the settings can be adjusted to taste, currently results in:

images

![original](/uploads/ee1431e902791605bbbb0438125ca9ab/original.gif)

random gif from images, a square, 904x904px, 245.5 kb

255x255px, 53.0 kb

alternate approaches:

using gif2webp handles conversion ok but does not have resize, meaning we have to do a more complicated 2-pass for questionable improvements
ffmpeg if you ever want to extend functionality to generating thumbnails of assorted videos, for gif to webp alone it's computationally intense

lmk if this helps

>Investigation is required - [animated webps exist and are supported by major browsers](https://developers.google.com/speed/webp/faq#:~:text=webp%20animation%20support%20). using a webm would turn the thumb into a video element, undesired converting a user gif into a thumbnail can be done like this (imagemagick 6.9.11) `convert original.gif -coalesce -filter Lanczos -resize "255x255>" -deconstruct miff:- | convert miff:- -define webp:method=6 -quality 50 thumb.webp` the settings can be adjusted to taste, currently results in: <details><summary>images</summary> ![original](/uploads/ee1431e902791605bbbb0438125ca9ab/original.gif) random gif from images, a square, 904x904px, 245.5 kb ![thumb](/uploads/38fbb2042f492ae8b2d88e426e1b12f9/thumb.webp) 255x255px, 53.0 kb </details> alternate approaches: - using [gif2webp](https://developers.google.com/speed/webp/docs/gif2webp) handles conversion ok but does not have resize, meaning we have to do a more complicated 2-pass for questionable improvements - [ffmpeg](https://superuser.com/questions/1408120/how-do-i-generate-webp-preview-animations-using-ffmpeg) if you ever want to extend functionality to generating thumbnails of assorted videos, for gif to webp alone it's computationally intense lmk if this helps

perdedora commented

2025-02-20 17:32:05 -06:00

All of our thumbnails are webp, including gifs which we convert to animated webp.

I could only make it work using convert. gif2webp was subpar for thumbnail because of resize options and ffmpeg too intensive.

https://github.com/perdedora/nicochan/blob/master/inc/image.php#L367-L418

All of our thumbnails are webp, including gifs which we convert to animated webp. I could only make it work using convert. gif2webp was subpar for thumbnail because of resize options and ffmpeg too intensive. https://github.com/perdedora/nicochan/blob/master/inc/image.php#L367-L418

Zankaria commented

2025-02-21 03:56:22 -06:00

Owner

webp can be animated!?

perdedora commented

2025-02-21 09:42:00 -06:00

@Zankaria wrote in #65 (comment):

webp can be animated!?

Yes.
https://magalichan.com/media/b86e0279efef865522ce2fcd5ed5c02ed8c398ad8f7efebacb5f6c74b13a7fcf_t.webp

@Zankaria wrote in https://forgejo.leftypol.org/leftypol/leftypol/issues/65#issuecomment-350: > webp can be animated!? Yes. https://magalichan.com/media/b86e0279efef865522ce2fcd5ed5c02ed8c398ad8f7efebacb5f6c74b13a7fcf_t.webp