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

Mike Scheutzow mike.scheutzow at alcatel-lucent.com
Thu Jul 5 15:03:47 CEST 2012

Tim Nicholson wrote:
> If I could relate the coefficients as defined in the two files above I
> might be able to add 634/smpte 170m (they use the same values) to
> colormatrix to provide a workaround...

Did you look at the ff_yuv2rgb_coeffs[] table?

The comments imply that it already defines 170m. But the sws api doesn't 
seem to give you an easy way to select it.

You could change SWS_CS_DEFAULT and recompile, if you're willing to 
maintain a private build.

Mike Scheutzow

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