On 11/5/2012 11:51 PM, Mark wrote:
On Mon, Nov 5, 2012 at 2:42 PM, Robert Voinea <[email protected]> wrote:
On Monday 05 November 2012 18:38:07 Pritam wrote:
On Monday 05 November 2012 05:24 PM, Robert Voinea 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! :)
QtMultimediaKit or QtMultimedia doesnt depend on phonon. The backend for
them on Linux is GStreamer.
If you have gstreamer installed and still not able to play, test that
gstreamer plugins required for your media are installed.
To test that, you can try playing your media in Totem, it has plugin
discovery built in. If it plays problem is with your Qt Build (if you
built Qt yourself) or your qt code. If doesn't play it will tell you
which plugins to install.
Thank you for clearing that up.
I had the impression that QtMultimediaKit depended on phonon...
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Actually, that is (partly) true. The QtMultimedia CLASSES depend on
phonon: http://qt-project.org/doc/qt-4.8/qtmultimedia.html
But the new QtMultimedia module isn't the same as the current
QtMultimedia module. The reason for that (afaict) is that
QtMultimediaKit comes from QtMobility which doesn't exist in Qt5. So
they took components of QtMobility and put them back in Qt as modules.
I hope someone else can do a better job in explaining it..
At the bottom of the linked document it states "The functionality
provided by the Phonon Module
<http://qt-project.org/doc/qt-4.8/phonon-module.html> is on a higher
level and in many cases more suitable for application developers.". This
doesn't mean the old QtMultimedia classes depended on Phonon and in
fact, they didn't as they actually predated Phonon support. Also, if you
look through QtMultimediaKit's source, at no point does it ever
reference Phonon. Neither do the new QtMultimedia modules in Qt5.
QtMultimedia/Kit does not depend on Phonon.
Yeah, it's confusing. I know :)
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