NG
For SD programmes that would potentially make things worse, not better, as you'd be down-converting an up-convert, which tends to knock the edges off the picture a bit (though this may make the content slightly easier to compress at a given bit rate I guess, assuming you don't get any aliasing introduced, which has the opposite effect)
(The BBC accepted this quality loss when they moved to BBC One SD being a down convert from BBC One HD, mainly because fewer and fewer SD shows are broadcast)
For HD originations you are only moving the downconversion process from upstream to downstream - so I guess a quality change for that would be a result of the downconverter being of different quality? (Downconverting HD to SD is a non-trivial exercise - and arguably just as, if not more, difficult than up converting - as you have to handle aliasing properly)
noggin
Founding member
UKTV Presentation
Has anyone else noticed a slight improvement to the PQ on the SD version of Gold? Makes me wonder if UKTV are down converting the HD feed.
For SD programmes that would potentially make things worse, not better, as you'd be down-converting an up-convert, which tends to knock the edges off the picture a bit (though this may make the content slightly easier to compress at a given bit rate I guess, assuming you don't get any aliasing introduced, which has the opposite effect)
(The BBC accepted this quality loss when they moved to BBC One SD being a down convert from BBC One HD, mainly because fewer and fewer SD shows are broadcast)
For HD originations you are only moving the downconversion process from upstream to downstream - so I guess a quality change for that would be a result of the downconverter being of different quality? (Downconverting HD to SD is a non-trivial exercise - and arguably just as, if not more, difficult than up converting - as you have to handle aliasing properly)