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Old 17th August 2015, 11:35   #32  |  Link
hello_hello
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Join Date: Mar 2011
Posts: 4,823
Quote:
Originally Posted by feisty2 View Post
there will be NO color difference between these 2 copies
Well that makes me feel a bit better. If there was a reason why converting the colours would have a detrimental effect, I'd reconsider whether doing so was a good idea. Is there a circumstance when converting the colours that way while re-encoding video would be detrimental?

Of course much of the time the colour primaries, transfer characteristics and matrix coefficients aren't known. I just checked a Bluray rip on my hard drive and MediaInfo doesn't show info for any of them. So I guess all I can do is assume the source matrix coefficients are rec.709 and write that to the video stream when encoding, or write rec.601 if converting the colours. My understand is it's best not to specify anything for colour primaries or transfer characteristics unless you actually know what they should be, so unless I do, I don't. I assume that's the right thing to do?
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