>>107048613
I'm saying 4chan does both. They directly handle images they're able to decode on 2012 software. When said 2012 software cannot decode an image they hand it over to kikeflare, who then converts it to a decodable image for 4chan. It's VERY plausible that a simple update would fix this.

Mozjpg is fully intended to be backwards compatible with UPDATED JPG decoders which 4chan clearly doesn't have.

As for H264, see picrel. Now take into account that the bitrates allowed by 4MB file size limits are dogshit low. You can barely post a high quality webp with VP9, AV1 was going to give 4chan Blu-ray quality at 4MB. But nah, here's an extremely outdated video codec that looks like shit especially at low bitrates.

https://www.nvidia.com/en-us/geforce/guides/broadcasting-guide/