[Interest] QtQuick and Video

[Mark]

On Mon, Nov 5, 2012 at 12:54 PM, Robert Voinea <rvoinea at gmail.com> wrote:
> Hi
>
> Has anyone tried the QtQuick 1.0/1.1 and Video combination?
>
> I have to implement a simple interface for several video streaming sources in
> QML (one video "window" and several buttons that change the video source) and
> I don't seem to get it right.
>
> I am using ubuntu 12.10.
>
> QtMultimediaKit is installed, and phonon-backend-vlc... and phonon-backend-
> gstreamer. In system settings I have set vlc as the preffered phonon
> backend... But it get this on the console when I try to load a simple video
> (captured with VLC from my laptop's webcam):
>         (test:11708): GStreamer-CRITICAL **: gst_object_ref: assertion `object !=
> NULL' failed
>         (test:11708): GStreamer-CRITICAL **: gst_object_ref: assertion `object !=
> NULL' failed
>         (test:11708): GStreamer-CRITICAL **: gst_element_set_state: assertion
> `GST_IS_ELEMENT (element)' failed
> Apparently phonon ignores the vlc backend and always uses gstreamer.
> (any ideea how can I force phonon to use the vlc backend instead of
> gstreamer?)
> At this point I don't use streams... but a single file (OGG/Theora).
> This is my test file:
>
> import Qt 4.7
> import QtMultimediaKit 1.1
> Rectangle
> {
>         id: rootWindow
>         width: 1024
>         height: 768
>         Video
>         {
>                 id: video
>                 width: 640
>                 height: 480
>                 anchors
>                 {
>                         centerIn: parent
>                 }
>                 fillMode: Video.PreserveAspectFit
>                 source: 'test.ogv'
>         }
> }
>
> I have tried with both gstreamer and vlc backends. I don't care which one I
> have to use as long as I can set the source as an URL...
>
> At the moment I am considering writing my own QML element that displays a
> video stream using (probably) the native vlc API... or something like this:
> http://www.meegoexperts.com/2011/09/phonon-video-player-qml/.
>
> Thank you in advance! :)
>
> --
> Robert Voinea
> Software Engineer
> +4 0740 467 262
>
> Don't take life too seriously. You'll never get out of it alive.
> (Elbert Hubbard)
>
>
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Hi,

If memory serves me right then QtMultimediaKit (now obsolete and
replaced with QtMultimedia [1]) doesn't have a phonon backend. The
plugins folder [2] seems to confirm that. So you can probably do a few
things now.
1. Implement a phonon backend in QtMukltimedia
2. use the Phonon qml components to which you already linked
3. Write your own.

Hope that helps.

Cheers,
Mark

[1] https://qt.gitorious.org/qt/qtmultimediakit/blobs/master/README
[2] https://qt.gitorious.org/qt/qtmultimedia/trees/master/src/plugins