[FFmpeg-user] Default RGB to YUV conversion

[Andy Furniss]

Florian Friedrich wrote:
> Dear Carl Eugen,
>
> Before looking into the source code (I¹m not a professional
> programmer and it¹s hard to follow the route of the pixels), may I
> ask this question please: Is there a way to influence the initial
> RGB->YUV conversion, picking either 601 or 701 or something else? I
> got the impression that there is no parameter and the initial
> conversion always follows 601 equasions.

-vf scale="out_color_matrix=bt709"

Seems to work for me in a quick test.

https://www.ffmpeg.org/ffmpeg-filters.html#scale-1

IIRC the range options are more confusing in that to get rgb to yuv full
they don't work, and have lead threads/issues. In that case yuvj is the
way to go.