[gst-devel] 2x2 videowall pipeline

[David Balch]

Brilliant!

This now works:

gst-launch-0.10 v4l2src device=/dev/video0 !
video/x-raw-yuv,width=320,height=240 ! alpha ! queue ! videomixer
name=mix ! ffmpegcolorspace ! autovideosink \
  videotestsrc pattern="green" ! video/x-raw-yuv,width=320,height=240
! alpha ! videobox left=-320 border-alpha=0 ! queue ! mix. \
  videotestsrc pattern="blue" ! video/x-raw-yuv,width=320,height=240 !
alpha ! videobox top=-240 border-alpha=0 ! queue ! mix. \
  videotestsrc pattern="red" ! video/x-raw-yuv,width=320,height=240 !
alpha ! videobox left=-320 top=-240 border-alpha=0 ! queue ! mix.

Thanks Luciana! :-D

I only have one cam with me at the moment, but hopefully I'll be able
to add more without too much trouble. I'll let you know how I get
on...

Cheers,
Dave.

On 18 November 2010 16:06, Luciana Fujii Pontello
<luciana at holoscopio.com> wrote:
> On Thu, 2010-11-18 at 15:40 +0000, David Balch wrote:
>> Hi,
>
>> gst-launch-0.10 v4l2src device=/dev/video0 !
>> video/x-raw-yuv,width=320,height=240 ! queue ! videomixer name=mix !
>> ffmpegcolorspace ! autovideosink \
>>   videotestsrc pattern="green" ! video/x-raw-yuv,width=320,height=240
>> ! videobox left=-320 border-alpha=0 ! ffmpegcolorspace ! queue ! mix.
>> \
>>   videotestsrc pattern="blue" ! video/x-raw-yuv,width=320,height=240 !
>> videobox top=-240 border-alpha=0 ! ffmpegcolorspace ! queue ! mix. \
>>   videotestsrc pattern="red" ! video/x-raw-yuv,width=320,height=240 !
>> videobox left=-320 top=-240 border-alpha=0 ! ffmpegcolorspace ! queue
>> ! mix.
>>
>> Unfortunately, the webcam doesn't actually show - it's corner is just
>> black. (The webcam works with "gst-launch-0.10 v4l2src
>> device=/dev/video0 ! video/x-raw-yuv,width=320,height=240 !
>> autovideosink".)
>
> It seems like the property border-alpha is not working for you because
> your video doesn't have alpha channel. Add an alpha element in every
> video like this: videotestsrc pattern="blue" !
> video/x-raw-yuv,width=320,height=240 ! alpha ! videobox top=-240
> border-alpha=0 ! queue ! mix.
>
> (I think you can remove some of the colorspaces as well)
>
> Regards,
>
> Luciana Fujii
>
> ------------------------------------------------------------------------------
> Beautiful is writing same markup. Internet Explorer 9 supports
> standards for HTML5, CSS3, SVG 1.1,  ECMAScript5, and DOM L2 & L3.
> Spend less time writing and  rewriting code and more time creating great
> experiences on the web. Be a part of the beta today
> http://p.sf.net/sfu/msIE9-sfdev2dev
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>



-- 
http://www.witchesband.com/