L'octidi 28 nivôse, an CCXXIII, Kieran Kunhya a écrit : > > There is a very simple way of flagging content that is supposed to comply > > with BT601: the SAR is 512/351. If SAR is 64/45, that means someone before > > nvenc decided that the video is not expected to conform with BT601, and > > nvenc has no right to decide otherwise. > You fail to realise this but SARs are not necessarily arithmetic for > historical reasons.
Care to explain how historical reasons can change the laws of geometry? If a visible surface with a physical aspect ratio of 16/9 is cut into 702×576 identical rectangular pixels, then the aspect ratio of each pixel is (16/9) / (702/576) = 512/351. Can you give one good reason for FFmpeg to use, internally, any other value? Regards, -- Nicolas George
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