QML MediaPlayer and Gstreamer pipeline with rtspsrc

kostya.til

I use qt 5.15.2. The documentation states that since Qt 5.12.2, the url scheme gst-pipeline provides custom pipelines for the GStreamer backend. I am trying to apply this pipeline:

"gst-pipeline: rtspsrc location=rtsp://ip_address:port/something latency=100 protocols=tcp ! rtph264depay ! h264parse ! avdec_h264 ! videoconvert ! qtvideosink"

But it gives me error:

Error: "Resource not found."

"gst-pipeline: videotestsrc ! qtvideosink" works fine. What could be wrong? Or QT does not support rtspsrc?
And by the way, if I use this pipeline with gst-launch-1.0 all works fine.

SGaist

Hi and welcome to devnet,

Does that pipeline work properly on the command line ?

kostya.til

Yes. On the command line it works properly. I use this command:

gst-launch-1.0 rtspsrc location=rtsp://ip_address:port/something latency=100 protocols=tcp ! rtph264depay ! h264parse ! avdec_h264 ! videoconvert ! autovideosink

And this works as expected.
By the way, my system is ubuntu 20.04 LTS. Could this be due to the fact that I installed QT using the online installer, and the Gstreamer was installed using the apt package manager? Maybe I need to install something else?

SGaist

To the best of my knowledge, it should be no problem.

Can you try to build and run your application with your distribution provided Qt ?

kostya.til

Just tried to build app with distribution provided Qt, have same error.

SGaist

And if you run the pipeline with the autosink in place of qtvideosink ?

kostya.til

I already understand what the problem is. It was a stupid mistake on my part. It's all about quotes. The URL of my resource contains equal signs and therefore gave an error on the command line without quotes. So, along with quotes, I moved the pipeline to my application. But for some reason it refused to work with quotes. Without quotes, everything works as it should. Thank you for your attention.

SGaist

Glad you found out and thanks for sharing !

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