[FFmpeg-devel] avcodec/prores_aw : add support for alpha encoding

[Martin Vignali]

Le dim. 21 oct. 2018 à 18:59, Reto Kromer <lists at reto.ch> a écrit :

> Martin Vignali wrote:
>
> >prores_ks take care about alpha data size, for yuv encoding (in
> >other word reduce quality of yuv data if there is alpha), but
> >it's seems that this is not the case of the official encoder
>
> No, it isn't.
>
> >So for prores_aw, i choose to separate yuv encoding and alpha
> >encoding.
>
> In my opinion, this is indeed the way to go.
>
> >I only choose to support 16b alpha (not the 8 bit version (and
> >don't plan to add it))
>
> I agree. More important than 8-bit alpha would be 12-bit Y'CbCr
> which is generated by many modern cameras (and the the same
> sensors are used in some film scanners as well).
>
> Hope this is helpful! Reto
>
>
Thanks for comments.

For the 12 bit support, do you know what need to be done, for a support
inside the encoder/decoder ?

Martin