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Couldn’t you just encode the video for all 31 other public keys?

I believe Apple explicitly said it was still end-to-end encrypted.

You never encrypt anything but the session key with the public key in this case all chat participants will exchange a single shared session key.

Wouldn't this increase the upload bandwidth needed by 31?

There might be a way for it to be end-to-end encrypted, but it's not a simple problem.

You could use a block cipher for the actual video stream with a single key, and encrypt that key with all 31 public keys.

That was the kind of thing I was thinking of. One video stream someone encrypted so any one of X people could decode it.