[gst-devel] I420 + alpha

Benjamin Otte in7y118 at public.uni-hamburg.de
Thu Mar 17 04:22:16 CET 2005

On Wed, 16 Mar 2005, Gergely Nagy wrote:

> In our application, we have an I420 format source, which I need to
> modifiy (blend stuff on it), and pass it to theoraenc, which wants I420.
> Right now, I need to convert the whole thing to AYUV, and then back.
> This results in significantly more resource usage and it takes a lot of
> time.
> To solve this, I'd like to have a new format, which is essentially I420
> with a full-size alpha plane appended (appended, because then it is easy
> to strip, or simply ignore).
> This way, I could make our application able to work without any kind of
> expensive colorspace conversions, and could use the same buffer the
> first element in the pipeline gave me. In my experience, this makes the
> whole thing significantly faster.
> Question is, how should I call this new format? I thought of A420, but
> people here might have better ideas.
stupid question:
Does a format that does this already exist somewhere?
It sounds like a reasonable format to have to me and if it were already
existing somewhere we could just use that name.

Although converting from I420 to AYUV and back shouldn't really be that
performance-reducing, or is it?


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