seekslider with streming flv video

hi,

I'm in trouble understanding the behaviour of seekSlider giving me when playing a .flv video from the net.
Here the code I use:

Code:

---

mediaObject=videoPlayer->mediaObject();
    mediaObject->setCurrentSource(Phonon::MediaSource(url));
    mediaObject->setObjectName("Video_output");
 
    videoPlayer->videoWidget()->setObjectName("Videowidget");
 
    audioOutput = videoPlayer->audioOutput();
    audioOutput->setObjectName("Audio_output");
 
    seekSlider->setMediaObject(mediaObject);
    seekSlider->setSingleStep(1000);
 
    connect(mediaObject, SIGNAL(tick(qint64)), this, SLOT(tick(qint64)));
    connect(mediaObject, SIGNAL(seekableChanged(bool)), this, SLOT(seekableChanged(bool)));
    connect(mediaObject, SIGNAL(finished()), this, SLOT(onVideoPlayFinished()) );
 
    mediaObject->play();

---

when I use videoPlayer->seek(n) or move it manually in the gui and the url (streming from internet) is a .mp4 the slider works, when its a .flv the video restarts. But when the .flv is stored on the hd it works as expected.
The seekableChanged always return true.

thanks for any suggestions
regards
Marco

well, I didn't find a solution yet (if there is one). The player should stream from youtube, so, maybe this is the problem. I forgot to mention that I tried to stream a .flv from the other pc through http and it works.
I have a gitorious repo for who like to view the code:
git://gitorious.org/mediadownloader/mediadownloader.git
that function is in mediaplayer.cpp at line 453

thanks for all