The video embed system in XMG works off of the BB Code Media Site System.
You can choose which BB Code Media Sites can be used in the gallery based on the ones you have installed. By default, that is YouTube, Vimeo, DailyMotion, Facebook etc.
Obviously with
add-ons like this it means you can actually add pretty much any video / audio / media service to the gallery as you like.
It's all very easy.
Here's a YouTube video someone added recently:
http://xenmediagallery.com/media/meow-mix-song-edm-cat-remix-by-ashworth-youtube.1251/
The default sites that come with XenForo (excluding Facebook) all automatically grab a thumbnail for the video too:
http://xenmediagallery.com/media/categories/videos.6/
But it's important to note, that getting thumbnails for other video services would require custom development. I can probably help with that if necessary. But it's also important to note that some sites cannot have thumbnails at all.
SoundCloud is interesting because really they don't have thumbnails, as such, but I have made sure it's possible to add thubmnails manually (uploading a thumbnail for each video) or set it so that the same thumbnail can be used for all videos like what
@MattW has done with SoundCloud on his site:
Hope that answers the question
