Dear ME: Thanks for your response. There are multiple aggregation models already in use and already accepted - see here: https://www.streamingmedia.com/Articles/ReadArticle.aspx?ArticleID=139140 AFAIK, there are no metrics that don't produce an aggregated score; VMAF does, SSIMPLUS does, all the legacy metrics do. You're already aggregating by segment; how much difference would it be for the whole file? For convenience? A program can find a score anywhere in the file. Humans need to scroll to see it. So you're putting it last where a human has to work the absolute hardest to see it when it makes no difference to the machine? It's much less convenient for the human and makes no difference to the machine. Thanks again for your answers.