YUV to RGB conversion of decoder output

Hi,

<Newbie Warning - Question could sound lame>

I've an application which selectively decodes iFrames in a video (mpeg4 only for now) and hence I use ffdec_mpeg4 in the pipeline. The output I get is in YUV format and I need to convert it to RGB so I can build a QPixmap (Qt image representation class) from it.

How do I do that?

I tried - setting the caps as "video/x-raw-rgb" for the src pad of decoder but that didn't work. Also I tried putting a capsfilter with caps = "video/x-raw-rgb" and followed by a ffmpegcolorspace element but that didn't quite work. I don't want to set other structures such as width height depth etc since that could vary from video to video.

PS - I could just write my own yuv->rgb routine but want to check if this can be done in the pipeline itself.

Thanks

Rohit

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[Edward Hervey]

On Tue, 2010-12-21 at 20:44 +0530, Rohit Atri wrote:

> Hi,
> <Newbie Warning - Question could sound lame>
> I've an application which selectively decodes iFrames in a video
> (mpeg4 only for now) and hence I use ffdec_mpeg4 in the pipeline. The
> output I get is in YUV format and I need to convert it to RGB so I can
> build a QPixmap (Qt image representation class) from it.
>
>
> How do I do that?
>
>
> I tried - setting the caps as "video/x-raw-rgb" for the src pad of
> decoder but that didn't work. Also I tried putting a capsfilter with
> caps = "video/x-raw-rgb" and followed by a ffmpegcolorspace element
> but that didn't quite work.

  You need to put your capsfilter *after* ffmpegcolorspace (you want it
to output RGB regardless of what it has in input).

    Edward

>  I don't want to set other structures such as width height depth etc
> since that could vary from video to video.
>
>
> PS - I could just write my own yuv->rgb routine but want to check if
> this can be done in the pipeline itself.
>
>
> Thanks
> Rohit
> ------------------------------------------------------------------------------
> Lotusphere 2011
> Register now for Lotusphere 2011 and learn how
> to connect the dots, take your collaborative environment
> to the next level, and enter the era of Social Business.
> http://p.sf.net/sfu/lotusphere-d2d
> _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel

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Oh god! I kinda feel embarrassed now :) But the embarrassment was worth the lesson I learnt! 

Thanks Edward, that worked.

On Tue, Dec 21, 2010 at 9:16 PM, Edward Hervey <[hidden email]> wrote:

On Tue, 2010-12-21 at 20:44 +0530, Rohit Atri wrote:
> Hi,
> <Newbie Warning - Question could sound lame>
> I've an application which selectively decodes iFrames in a video
> (mpeg4 only for now) and hence I use ffdec_mpeg4 in the pipeline. The
> output I get is in YUV format and I need to convert it to RGB so I can
> build a QPixmap (Qt image representation class) from it.
>
>
> How do I do that?
>
>
> I tried - setting the caps as "video/x-raw-rgb" for the src pad of
> decoder but that didn't work. Also I tried putting a capsfilter with
> caps = "video/x-raw-rgb" and followed by a ffmpegcolorspace element
> but that didn't quite work.

 You need to put your capsfilter *after* ffmpegcolorspace (you want it
to output RGB regardless of what it has in input).

   Edward

>  I don't want to set other structures such as width height depth etc
> since that could vary from video to video.
>
>
> PS - I could just write my own yuv->rgb routine but want to check if
> this can be done in the pipeline itself.
>
>
> Thanks
> Rohit

> ------------------------------------------------------------------------------
> Lotusphere 2011
> Register now for Lotusphere 2011 and learn how
> to connect the dots, take your collaborative environment
> to the next level, and enter the era of Social Business.
> http://p.sf.net/sfu/lotusphere-d2d
> _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel



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