[gst-devel] Overlaying an image on a live stream

[Vogan]

Hi 

Thanks for the help, I am now trying this

gst-launch v4l2src device=/dev/video0 !
'video/x-raw-yuv,width=320,height=240,framerate=30/1' ! ffmpegcolorspace  !
videomixer name=mix ! xvimagesink filesrc location=crosshair.png ! pngdec !
ffmpegcolorspace ! freeze ! mix.

and are getting the following error once the pipeline has started

ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal
data flow error.
Additional debug info:
gstbasesrc.c(2234): gst_base_src_loop ():
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
streaming task paused, reason not-negotiated (-4)

The image I am trying to overlay has a transparent background and is 386x386
pixels.

Any ideas?

Vaughan


sudarshan bisht wrote:
> 
> Hi ,
> 
>  videomixer works on AYUV ( that means yuv data having alpha values for
> transparency ) and pngdec  gives RGB data , that's why these two elements
>  are not linking .
> 
> Try putting ffmpegcolorspcae after pngdec .
> 
> On Wed, Mar 31, 2010 at 12:58 AM, Vogan <vaughan at infact.co.nz> wrote:
> 
>>
>> Hi
>>
>> I am wanting to overlay an image (crosshairs inthis case) on top of a
>> stream
>> from a web cam.  The image is a png file with a transparent background.
>>  The
>> pipeline I have tried is
>>
>> gst-launch v4l2src device=/dev/video0 !
>> 'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! videomixer
>> name=mix
>> ! xvimagesink ! filesrc location=crosshair.png ! pngdec ! mix.
>>
>> When I try to run this I get WARNING: erroneous pipeline: could not link
>> pngdec0 to mix
>>
>> Any hints on what I am doing wrong? or is it simply not possible to
>> overlay
>> a static image on a live stream?
>>
>> Vaughan
>>
>> --
>> View this message in context:
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>>
>>
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> 
> 
> 
> -- 
> Regards,
> 
> Sudarshan Bisht
> 
> ------------------------------------------------------------------------------
> Download Intel&#174; Parallel Studio Eval
> Try the new software tools for yourself. Speed compiling, find bugs
> proactively, and fine-tune applications for parallel performance.
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