AW: bayer to YV12 conversion

[Christian Sell]

I have looked into this subject. Using shader-based debayering is IMO really something you want to do close to the UI, for these reasons:

 

-          You need an OpenGL context to install the shader. This is typically only available close to the UI

-          You also save bandwidth, because the debayered material is 3-4 times bigger than the non-debayered

 

For these reasons I have some to the conclusion that a gstreamer element is not the right place to do shader-based debayering.

 

Von: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org] Im Auftrag von Hamdi Rakkez
Gesendet: Donnerstag, 23. Juli 2015 18:03
An: Nicolas Dufresne <nicolas.dufresne at collabora.com>; Discussion of the development of and with GStreamer <gstreamer-devel at lists.freedesktop.org>
Betreff: Re: bayer to YV12 conversion

 

I see and it's very interesting to have an element which is based on GL shaders and convert bayer to raw-YV12.

 

Thanks.

 

On Thu, Jul 23, 2015 at 4:23 PM, Nicolas Dufresne <nicolas.dufresne at collabora.com <mailto:nicolas.dufresne at collabora.com> > wrote:

Le jeudi 23 juillet 2015 à 15:15 +0100, Hamdi Rakkez a écrit :
> - x-bayer,format=any -------> x-raw,format=YV12
>
> I don't want to use bayer2rgb then use glcolorspace or videoconvert
> to pass from RGB to YV12.

There is no direct converter at the moment. The fact that bayer is not
considered a video/x-raw format might make it difficult to get into
videoconvert in the end. Someone would have to put serious thought into
that. Dealing with bayer format in software is also rare, which means
rare are the hackers that cares. Feel free to propose an element for
that. If you think it can be done with GL shaders, you could consider
adding glbayer2yuv filter (or using two GPU pass, glbayer2rgb followed
by glcolorscale (would ideally be glcolorconvert in 1.5+).

Nicolas
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