Converting this GStreamer pipeline to QGstreamer

xargon daga_pankaj at
Sat Apr 9 08:13:22 UTC 2016

I have a GStreamer pipeline which is basically streaming video from a camera
to the screen. The pipeline is as follows:

get-launch-1.0 -v v4l2src device=/dev/video0 ! "video/x-raw, width=1920,
height=1080, format=(string)YUV2, framerate=30/1" ! videoconvert !
nveglglessink sync=false -e

Now, I was trying to convert this pipeline using QtGStreamer as follows:

QGst::PipelinePtr pipeline = QGst::Pipeline::create();

//create the v4l2src element
QGst::ElementPtr videoSource = QGst::ElementFactory::make("v4l2src");
videoSource->setProperty("device", "/dev/video0");

QGst::CapsPtr caps =

QGst::ElementPtr videoConvertElement =

This is where I got stuck. How can I specify the capability of the video
source? Secondly, I am using HW acceleration and using nveglglessink as I
would also like to later encode this stream as H264 video and save it to
disk. I am not sure how to use this sink element in my qt application.

I am new to both gstreamer and QtGStreamer. Any help/guidance would be
greatly appreciated!

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