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In thruth it seems really strange to me that a reference would say "if you don't know, do as you please".
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BTW you can access the official references? They are not public and require a login. In this case you sure have the latest version?
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They are freely accessible since a while:
http://www.itu.int/rec/T-REC-H.262/en
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Much interesting is your second links, in wich at a glance it appears that "BT601 for SD and 709 for HD"
And this statement i've personally read in clear or between the lines on many places.
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Yes, many people say so. But at the end, only the dvd specs can give a definite answer. Unfortunately i don't know anyone who has them.
A separate issue is what the players and renderers do when playing video. Many of them are ignoring that setting in the mpeg-2 header. There is a lot of discussion about that too in those threads.