Maybe it is time to think about using online cloud encoding likeBut in reality it's 5% of what will be the true "non compressed" file if I could put it here.
But this 30 mns video, with my exporting configuration at 30 Mb/s ( under is fucked up for 4K ), takes long time to be done on the last MacBookpro with 16GB ram.
Also the 4K is very nice but if you watch it on 720p streaming it's not so good quality even it can be looking bad if you have shit screen resolution, and if I give you a real 4K streaming, with the number of people who have clicked the two last days, it will have cost me more money than I have got !!!
https://zencoder.com/en/file-transcoding/pricing#basic
or
http://www.heywatchencoding.com/pricing
it is much more flexible in terms of scalability ,speed,evolutivity,cost linearity
than any other solutions
Plus i do not know what is your storage solutions but it seems quite costly
i did some quick math assuming you get 6k customers downloading all your videos
in full hd ie 72mo/minute filesize and you released 1435min of videos last month
it does around 64000 To of downloaded data.
using amazon cloudfront it would amount around 6.4 dollars/user which seems
quite reasonable.
you can do some quick math to compare using
http://www.cdn77.com/calculate-price
https://www.scaleengine.com/pricing/