Xvid 4:4:4

[morsa]

Is there support for 4:4:4 color sampling inside Xvid?
I was wondering about this after seeing that the new HDCAM SR uses Mpeg4 SP (studio profile supports 10 bit per channel) for it's compression giving a maximum rate of 79 MBytes/s.
It would be really great if Xvid could support this sampling scheme, so combined with a low quantizer it could become the Open source alternative for HD editing..
(I don't know if the 10 bit per channel support is posible to implement or not anyway)

[Koepi]

XviD is an MPEG4 ASP (Advanced Simple Profile) en-/decoder. So it doesn't support studio profile, and I see noone with the interest in implementing that.

Cheers
Koepi

[morsa]

What a pity then :(
I see I will need to wait for some years till 10 bit becomes the standard and someone out there thinks it is worth the effort to implement it....
Thank you anyway :)
cheers

[PowerMacG4]

Originally posted by morsa
What a pity then :(
I see I will need to wait for some years till 10 bit becomes the standard and someone out there thinks it is worth the effort to implement it....
Thank you anyway :)
cheers

I doubt 10-bit will ever become "the standard".

[Prettz]

I was wondering, since all image data ends up being represented as DCT coefficients and not pixels, would 4:4:4 translate into 10-bit DCT coefficients? :confused:

[Sulik]

DCT coefficients are already 12-bit for 8bpp. 4:4:4 does not change that (4:4:4 only means full chroma resolution, ie 12 blocks/macroblock).

10-bit per pixel planes however would require 14-bit DCT coefficients for an identical quantization level.