[FFmpeg-user] YUV->RGB conversion. What is the default matrix used?

Mike Scheutzow mike.scheutzow at alcatel-lucent.com
Fri Jul 6 15:49:08 CEST 2012

Tim Nicholson wrote:
> Yes, but the coefficients are the same as 624-4. So is that really the
> case, or are they just there for "future expansion" and yet to be
> properly populated?

It looks to me like 'ITU-R 624-4 System B,G' is better known as 'ITU-R 
BT.470 System B,G'.

And according to this link, 'Smpte 170M' and 'ITU-R BT.470 System B,G' 
are extremely similar colorspaces:


so, it's not surprising that the coefficents match.

Mike Scheutzow

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