You can import any URL <x id="START_LINK" ctype="x-a" equiv-text="<a>"/>supported by youtube-dl<x id="CLOSE_LINK" ctype="x-a" equiv-text="</a>"/> or URL that points to a raw MP4 file. You should make sure you have diffusion rights over the content it points to, otherwise it could cause legal trouble to yourself and your instance.
Max simultaneous lives created on your instance <x id="START_TAG_SPAN" ctype="x-span" equiv-text="<span class="text-muted">"/>(-1 for "unlimited")<x id="CLOSE_TAG_SPAN" ctype="x-span" equiv-text="</span>"/>