[gst-devel] Gstreamer application development

jodim jodim at innomak.co.uk
Wed Dec 27 23:24:24 CET 2006

    First of all I would like to congratulate all gstreamer coders & 
gurus out there for their continued effort to provide the Linux 
community with a media framework nearing the caliber of existing 
commercial libraries.

Now for the question:

    We have a requirement for a video capture application that should be 
able to grab 2 or more video sources, encode them to disk in mpeg2 
format while at the same time display them in the screen. Now, the 
container is a KDE C++ application and using Kiss as a guide, we have 
implemented a self contained QT widget that takes an uri and plays the 
video overlayed to its windowId(). This works fine for as long as we use 
only one widget.
    BTW, we are using playbin as the element to play the test movie. If 
we try adding another widget, i.e. using two playbins, only one of them 
is ever displayed. After some debugging, we tried using gst editor to 
better understand what is happening. We used two test videosources 
directly conected to two xvimagesinks. The editor failed to start 
playing with the following error message:

"/pipeline0/xvimagesink1: Resource busy or not available.

    Additional debug info: xvimagesink.c(740): 
gst_xvimagesink_get_xv_support: /pipeline0/xvimagesink1:
No port available"

    However, if we use aasink as the sink elements, multiple video 
outputs work with out trouble. The question I would like to ask is 
whether its possible to have 2 or more xvimage sinks displaying video 
concurrently and if affirmative, what would be the best way to 
accomplish this.

Apologies in advance should this email be off topic.

Best Regards,

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