QML MediaPlayer. Custom source for gst-pipeline

[Ms.J]

@SGaist thankyou for your response
which massage? could you give me some suggestions about gstreamer pipelines in qml or documents that cover it?

[SGaist]

That message:

@Ms-J said in QML MediaPlayer. Custom source for gst-pipeline:

Warning: "Pipeline construction is invalid, please add queues."

Does your pipeline work properly on the command line ?

[Ms.J]

@SGaist I got the same corrupted video from command line :(
this is my command "gst-pipeline: udpsrc port=5000 ! h264parse ! avdec_h264 ! videoconvert ! autovideosink" for receive camera streamer. i searched and nothing helpfull found for that.
command line message:
Not enough buffering available for the processing deadline of 0:00:00.015000000, add enough queues to buffer 0:00:00.015000000 additional data. Shortening processing latency to 0:00:00.000000000.
any suggestion to improve pipelines for better preview?
thank you in advance.

[SGaist]

Add debugging to your pipeline, it may give you some more information about what is going on.

[Ms.J]

@SGaist Is it possible to receive stream in qml by FFMPEG decoder? like this command: ffplay udp://127.0.0.1:5000?
decoding in qt is software decode or hardware decode? how to know it?

[SGaist]

You can check the QtAV project.

[Ms.J]

@SGaist for android i could find gstreamer binary file for that ( https://gstreamer.freedesktop.org/download/ ) but i dont know how to add that libraries (libraries path) to project (in cmakelist or ?).
thank you so much.

[SGaist]

Did you already check the android platform notes for GStreamer ?

[Ms.J]

@SGaist yes i checked it.
i installed gstreamer-1.0 in my ubuntu and download video/android/gstreamer example.
when i want to build it for android (on ubuntu) i get following errors: :((

Project ERROR: Unknown module(s) in QT: multimediagsttools-private
[Inexact] Project ERROR: Library 'libresourceqt5' is not defined.
main.cpp:82:5: error: use of undeclared identifier 'QGstUtils'
main.cpp:54:10: error: 'private/qgstutils_p.h' file not found.

same problem: https://forum.qt.io/topic/122140/unknown-module-s-in-qt-multimediagsttools-private

Any advice is greatly appreciated.

[Ms.J]

for having gstreamer on android device, is it necessary to build Qt on ubuntu (for some config) or build gstreamer for android (how?)?
"gst-pipeline: videotestsrc ! autovideosink" worked on ubuntu.

thanks for your help.

[SGaist]

As the platform notes says, to use the GStreamer backend on Androïd, you have to build the module yourself.

[Ms.J]

@SGaist which module? where to get start? how to build gstreamer for android?
i'm new in Qt. please give me steps.
thanks a lot.

[SGaist]

At least the Qt multimedia module. You can already find pre-built versions of GStreamer for Androïd AFAIR.

I haven't built QtMultimedia to enable GStreamer for Androïd, but the basic are usually the same, use qmake, make, make install.

I would recommend backing up your current installation if something goes wrong.

And use out of source builds so you can experiment more easily.

[samup]

@SGaist Hello, could you refer me to this Gstreamer plugin package?

I'm trying the following qml:

MediaPlayer{
    id: playVideo
    source: "gst-pipeline: videotestsrc ! autovideosink"
    videoOutput: videoOutput
}

VideoOutput{
    id: videoOutput
    anchors.fill: parent
}

But as soon as the component is loaded I get this message:
qt.multimedia.player: Unable to set the pipeline to the paused state.

And I cannot visualize the pipeline. I tried using a generic video as source in the MediaPlayer component instead of a pipeline and it works.