MSC4011: Thumbnail media negotiation

[clokep]

Rendered

Author: @clokep, @Half-Shot

Fixes matrix-org/matrix-spec#453

[turt2live]

MSC2700 also discusses thumbnail requirements. MSC2705 also mentions requirements, though in different context.

[clokep]

Thanks! I hadn't had a chance yet to fully search for alternatives. 👍

[turt2live]

MSC2705 has now dropped its content type requirements, though MSC2702 imposes some strong recommendations (should be compatible with this MSC).

I'm closing MSC2700 in favour of this MSC.

[Half-Shot]

There stands to be a reasonable improvement for bridges, in that we could start requesting more compact formats when bridging images/videos etc to external networks. For instance, we could convert images to webp upon bridging to Discord if we wanted to, rather than serving the current files.

Bridges stand to benefit in about the same way as clients, albeit possibly unless the remote client limits our upload sizes it's probably not such a huge concern

[turt2live]

@clokep @Half-Shot : as authors, what's keeping this in draft? It feels ready for broader review/implementation.

[clokep]

@clokep @Half-Shot : as authors, what's keeping this in draft? It feels ready for broader review/implementation.

I think I was hoping @Half-Shot could fill in the impact on bridges section. (I see he left a comment though -- probably just needs to be converted to prose?)