could not link vtdec0 to videobox0

[Sebastian Dröge]

On Di, 2015-04-21 at 13:32 +0530, Who AmI wrote:
> Dear all,
> 
> I am trying to implement Picture In Picture feature in iPAD using GStreamer.
> 
> As a first step, i tried to understand videobox, and executed the below
> command
> in the command line in MAC.
> 
> ./gst-launch-1.0 udpsrc port=5000 ! "application/x-rtp,
> encoding-name=(string)H264, payload=(int)96, clock-rate=(int)90000" !
> rtph264depay ! h264parse ! vtdec   ! videobox top=-10  bottom=-20 !
> glimagesink sync=false
> 
> The below command works fine.
> 
> The same think i tried using GStreamer SDK.
> 
> 
>    pipeline = gst_parse_launch("udpsrc port=5000 ! application/x-rtp,
> encoding-name=(string)H264, payload=(int)96, clock-rate=(int)90000 !
> rtph264depay ! h264parse ! vtdec   ! videobox top=-10  bottom=-20 !
> glimagesink sync=false", &error);
> 
> 
> 
> Unfortunately i receive the below error:
> 
> could not link vtdec0 to videobox0
> 
> 
> That is:
> 
> *0:00:01.127516000  2660  0x3132860 ERROR           GST_PIPELINE
> ./grammar.y:616:gint gst_parse_perform_link(link_t *, graph_t *): could not
> link vtdec0 to videobox0*
> 
> following that,
> 
> udpsrc0: Internal data flow error .
> 
> Please let me know what is the issue ?

Check the GStreamer debug logs, it most likely says something about
incompatible caps. Are you using the same GStreamer version for both?
Does it work if you add a videoconvert between vtdec and videobox?

-- 
Sebastian Dröge, Centricular Ltd · http://www.centricular.com
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