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The biggest consequence would be that this opens the door for all software built on top of ffmpeg to add support for JPEG XL. Some might even support it automatically if they're linked against an ffmpeg which supports it.

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In particular mpv can now open jxl images, there is also a recent commit that adds support to make jxl screenshots.

As I use mpv both as a video player and as an image viewer, this is great news for me.

I've been waiting to use JPEG XL (.jxl) in my Video Hub App for over a year now! I even have a PR that shows that it works, but was waiting for FFmpeg to catch up.

https://github.com/whyboris/Video-Hub-App/pull/702

My software extracts screenshots from videos and shows them in a nice browsable searchable gallery.

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