On Wed, Mar 28, 2018 at 12:15 AM Jean-Baptiste Mardelle <j...@kdenlive.org>
wrote:
> On Monday, March 26, 2018 3:44:09 PM CEST, Brian Matherly wrote:
> > On 3/26/2018 1:49 AM, Jean-Baptiste Mardelle wrote:
> >> On 23.03.2018 18:42, Dan Dennedy wrote: ...
>
> Hi,
>
> > I think you have a few options:
> >
> > 1) Create a new image type in MLT: mlt_image_yuva444p16
> > I do not recommend this because it would be a lot of work.
> >
> > 2) Convert to mlt_image_yuv422p16 + alpha buffer
> > This option might be OK. You still lose half of the chroma
> > information converting from 444 to 422. And also, I would
> > recommend converting the alpha channels to an 8bit alpha buffer
> > because it would be a lot of work to find all the places that
> > use the alpha buffer and make sure they work with > 8 bits.
> >
> > 3) Convert to mlt_image_rgb24a
> > This would be my recommendation because it is the simplest.
> > Yes, you will lose some precision going from 40bpp to 32bpp. But
> > everything would just work and all you have to change is the
> > avformat_producer.
>
> Sure the 3rd option is much simpler, and since MLT doesn't currently
> support > 8bit buffers it won't make much difference in the result.
> A simple patch is in my github's fork:
>
>
> https://github.com/j-b-m/mlt/commit/d8c723130e34da7680b50b47bc31a927ef6414cd
>
> It supports both missing formats from the bugreport
> https://bugs.kde.org/show_bug.cgi?id=391963
>
> However more pixel formats will probably require the same adjustments in
> the future.
>
>
There are some areas where 10-bit video can be used through
mlt_image_yuv422p16, primarily only for input and output via decklink and
avformat. With some work, it can be added into movit integration for 16-bit
float processing. However, the change mentioned above will work until that
is done.
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