Yes you are right, I forgot about the shift for UV...

Arie Muijnck wrote:

Ø So to fix that you need to convert your gray scale to YUV format - and thats simple since gray scale is just the Y component, _and you would just fill *zeros* into the UV_. Then you feed that transformed image to the codec and your output is all compressed for you.

AFAIR it’s “fill in *_128_* into the UV” …

Arie

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