[FFmpeg-user] convert from bt601 to bt709

[Rio Kierkels]

>
> > Maybe try not to use the sws_flags at all and only use
> > filters_complex. sws_flags have never really worked for me.
>
> Did you report this?
>
> Carl Eugen
>

I should have of course but haven't been able to make a good test case yet.

An intermediate pixel format wouldn't be a bad idea at all.
I actually assumed that ffmpeg internally did all its calculations in the
best space possible like Nuke does it for example.

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