[gst-devel] video/x-raw-yuv, format=(fourcc)HDYC

[Edward Hervey]

On Wed, 2008-09-10 at 00:11 +0200, Julien Isorce wrote:
> 
> 
> 2008/9/9 Edward Hervey <bilboed at gmail.com>
>         
>         > Any plan to support HDYC format in gstreamer ?
>         
>         
>           If you have elements that support that format... you can
>         already do
>         it now. After all, it's just a matter of creating a caps (like
>         "video/x-raw-yuv,format=(fourcc)HDYC"). 
>         
>           The *real* problem is having elements that can convert
>         (properly)
>         from that colourspace/layout to other ones (like the ones used
>         by video
>         sinks or encoders).
>         
>           I don't know if anybody's planning that, but that wouldn't
>         be the
>         only issue with colourspaces in GStreamer (Anyone heard of
>         chroma
>         placement in subsampled video ?).
>         
>           It all comes down to having:
>           * A proper definition of colourspaces in raw video caps
>           * An element that *properly* does that conversion taking
>         into account
>         the correct conversion coefficients/clamping and chroma
>         placement. Oh,
>         and preferably with readable code (unlike ffmpegcolorspace).
> 
> Ok. I have some basic knowledges but I think I have not the background
> to make a such gst element (colorspace converter).
> It requires to know a lot of video formats in order to start good
> abstractions. And use appropriate libraries (liboil ?)
> For now I can start to add the HDYC to RGB convertion in the
> ffmegcolorspace element. (just to not forget this format ...)
> 
> Is there any thing about HDYC in the ffmpeg libs ?

  There is one mention of HDYC in the source code (liabvcodec/raw.c) ...
and that's to say it's UYVY422 (sigh). So they don't make a difference
between YUY2, Y422, UYVY and HDYC.

>  
>         
>         
>             Patches welcome :)
>         
>               Edward
> 
> Thx
> 
> Julien
>  
> 
>         
>         
>         
>         >
>         > (We have a Video Capture Device that delivers HDYC 1920*1080
>         only)
>         >
>         > Some docs here:  http://www.fourcc.org/yuv.php#HDYC
>         >
>         > It seems that the difference bettween UYVY and HDYC is just
>         the
>         > coefficients used in the yuv to rgb conversion.
>         > T470 coefficients in UYVY to rgb conversion (SD likes) and
>         > BT709 coefficients in HDYC to rgb conversion (HD likes)
>         >
>         > Sincerely
>         >
>         > J. I.
>         >
>         
>         >
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