[FFmpeg-devel] Again pre-multiplied alpha

[Nicolas George]

Niklas Haas (HE12025-07-23):
> Changes since v1:
> - Correctly implement alpha mode tagging for JPEG XL
> - Set correct alpha mode for OpenEXR (which is always premultiplied)
> - Ensure -alpha_mode specified on the command line correctly propagates
> - Print out a warning when overriding the alpha mode explicitly
> 
> Includes an unrelated fix for -chroma_sample_location also being ignored,
> since the fix for that was adjacent to the fix for the alpha mode field.
> 
> Submitting this for re-evaluation. I decided in the end not to include full
> negotiation for the alpha mode, primarily because there is no filter currently
> existing that only handles one or the other.

Also, negotiation is fragile and needs tests.

But can you point to where the code that prevents a component not
ready from receiving a premultiplied frame is?

Regards,

-- 
  Nicolas George