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Re:High Quality Video Encoding at Scale by mkagenius on Thursday December 10, 2015 @11:30AM (#10711470)
I haven't yet watched your linked video fully but at 8:00 he mentions they used ffmpeg in 2013:

https://youtu.be/tQrsz3BrfwU?t=480

Re:High Quality Video Encoding at Scale by garblegarble on Friday December 11, 2015 @06:12AM (#10716455)
Yeah, they talk in a couple of different videos about the different approaches they've used over the years