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Originally Posted by Blue_MiSfit
I have not personally messed with this, but my understanding is that this is extremely useful for ABR encoding. You save the analysis from a lower res encode and re-use it (with refinement) on a high res encode.
So for example if you have a 4k source and want to make 1080p and 4k variants, you do the 1080p encode, save the analysis data, then re-use it when doing the 4k encode. This saves a ton of largely redundant analysis on the 4k layer. There is a quality impact, but it's not much, and the compute you save can be sent on higher quality analysis 
There was a great talk at Demuxed 2018 about this https://www.youtube.com/watch?v=-yPOE2F9fDI from Alex Giladi from Comcast |
Yes.
I think it's pro profil too. For streaming like Netflix or Amazon, you make only one high quality encoding and you can remake all reencoding at the bitrate you want with really high speed and high quality. It's certainely like that Netflix can adapt quality for all user.