this post was submitted on 08 Sep 2025
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65
Help understanding video and image size restrictions (infosec.pub)
submitted 6 days ago by CubitOom@infosec.pub to c/asklemmy@lemmy.world
19 comments fedilink hide all child comments
 

Why is it that I can post the attached mp4 but not the source as a gif?

To make the mp4 I encoded the gif in handbrake, which actually made increased the file size but reduced the dimensions.

Source gif:  728*408, 785.5 KiB
Encoded mp4: 640*360, 836.7 KiB
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[–] SnotFlickerman@lemmy.blahaj.zone 2 points 5 days ago (1 children)

I only upload photos from the web interface. They all always become webp.

[–] tal@lemmy.today 1 points 5 days ago* (last edited 5 days ago) (1 children)

Hmm. I'm certain that they've just failed on lemmy.today's vanilla Lemmy Web UI, not converted.

goes to test

I just created a test (non-animated) gif. Trying to upload it just fails

that is, one can select it and try to upload it, but the Web UI never inserts the uploaded image URL in the textbox.

Here it is on catbox.moe:

collapsed inline media

If I convert it to a PNG, a format that pict-rs does understand, it uploads without being converted to WebP:

collapsed inline media

Maybe it's something unique to lemmy.blahaj.zone?

EDIT: There's an option in the docker/docker-compose.yml in the lemmy git repo showing an example of how to add an option to force pict-rs to convert everything to WebP. So my bet is that lemmy.blahaj.zone has done that:

https://github.com/LemmyNet/lemmy/blob/main/docker/docker-compose.yml

# we can set options to pictrs like this, here we set max. image size and forced format for conversion                                                                                                                                                      
# entrypoint: /sbin/tini -- /usr/local/bin/pict-rs -p /mnt -m 4 --image-format webp

EDIT2: @Ada@lemmy.blahaj.zone would know.

[–] ada@lemmy.blahaj.zone 2 points 5 days ago

We run our own custom image caching setup. I'll ask Kaity to look in to it and see what's going on