From the Sky NewsRaw it appeared the push back picture in picture was taking the International feed. When they showed the OverDrive console it appeared that the international feed is played from the gallery. It appeared as a VT
I haven't seen that part of Sky News Raw yet, but I'm fairly certain the internation feed content comes from transmission, not the gallery. It was clear from the shots of the gallery on Sky News Raw that while the UK and international feeds were on a break, the gallery programme output was often showing the ident, not the international filler. The only screen in the gallery I could see with the international content was in the group with the TX returns. Also international often opts out of sports segments/programing, while the gallery is running the UK output.
How many separate feeds/versions of Sky News exist at present?
I make it...
Sky News UK SD - As exists on DTT
/DSAT in UK - SD DOG
. Clock, UK Adverts
Sky News UK HD - As per Sky Ch 501 - HD DOG, Clock, UK Adverts
Sky News UK HD for streaming - As per AndroidTV/FireStick - In HD but without the HD indicator in the DOG, Clock, Adverts.
Sky News Irl HD - As per Sky 501 in Ireland. HD DOG, Clock, Irish adverts
Sky News Irl SD - As per Sky SD, SD DOG, Clock, Irish ads
Sky News Intl SD - As per feed at 19.2°E - SD DOG, Clock is masked with URL, breakfiller segments
Sky News Intl HD - I am assuming this must exist as the base for the other two intl feeds - but have not seen it.
Sky News Intl HD for Youtube - HD DOG, clock is masked, breakfiller sports further filled with more breakfiller.
A lot of these feeds are actually the same thing, there's really only 3 feeds: UK, Ireland and International. The HD DOG's are keyed on downstream for the HD services, which obviously doubles this to 6 feeds, but the only difference is the DOG. The ones you list as "Sky News Intl HD" and "Sky News Intl HD for Youtube" are definitely the same thing, YouTube is showing the base feed.
The SD services are actually HD, but downscaled prior to distribution. This is what you see in HD on the UK streaming services, which Sky do for all their channels on Sky Go for some reason, you'll notice they're all in HD but have the SD DOG's.
Just to really complicate it though, at one point Sky played out the ads seperate for each platform, so Sky, Cable and Freeview all had their own feeds, which was occasionally used to show separate promos. Not sure if they still do this however.