[FFmpeg-user] RGB-YUV color shift

[chris bouchard]

Bob Maple <bobm-ffmpeg <at> burner.com> writes:

> Could I ask how you are testing this?  I am getting quite the opposite 
> result converting a TGA codec Quicktime to ProRes or h264 using that 
> colormatrix conversion, the results are very different from the original.
> 
> Bob

I was using an RGB image sequence source - not a quicktime source, 
so that might already be 
assumed to be 709...

In the end I found that the default scaler was causing the slight green tint.

If you add this flag:

-sws_flags lanczos+accurate_rnd   

this fixed the green tint I was experiencing with the default down scaling. 
Note that lanczos alone will go green without the +accurate_rnd option.