<![CDATA[QMediaPlayer and QGraphicsVideoItem: unable to seek for a video file without audio thread]]>Hello!

I use QMediaPlayer and QGraphicsVideoItem for video output. When i try to seek for a video without audio thread video position isn't changed. Then i go to source code of DirectShow and notice that the method IMediaSeeking::setPosition() returns -2147467263(E_FAIL).

Win7 Professional SP1, Qt 5.3.1

Thanks.

]]>https://forum.qt.io/topic/47540/qmediaplayer-and-qgraphicsvideoitem-unable-to-seek-for-a-video-file-without-audio-threadRSS for NodeTue, 22 Sep 2026 00:44:42 GMTWed, 29 Oct 2014 12:48:27 GMT60<![CDATA[Reply to QMediaPlayer and QGraphicsVideoItem: unable to seek for a video file without audio thread on Fri, 31 Oct 2014 11:35:52 GMT]]>Hi I had same problem with videosurface, I guess there is a bug from somewhere when you switch from wmf to directx engine. I solved in this manner:
When you scroll or set direct position do
play->stop, change setOutputVideo(QVideoWidget reference) ,player->setPosition
and when release slider do
player->setOutPutVideo(QVideoGraphics or VideoSurface), player->play()

]]>https://forum.qt.io/post/249732https://forum.qt.io/post/249732Fri, 31 Oct 2014 11:35:52 GMT<![CDATA[Reply to QMediaPlayer and QGraphicsVideoItem: unable to seek for a video file without audio thread on Fri, 31 Oct 2014 10:14:35 GMT]]>Yes, media file with just one video thread.

]]>https://forum.qt.io/post/249723https://forum.qt.io/post/249723Fri, 31 Oct 2014 10:14:35 GMT<![CDATA[Reply to QMediaPlayer and QGraphicsVideoItem: unable to seek for a video file without audio thread on Fri, 31 Oct 2014 00:01:44 GMT]]>It even changes the problem completely.

When you say video without audio thread to you mean video without a sound track ?

]]>https://forum.qt.io/post/249647https://forum.qt.io/post/249647Fri, 31 Oct 2014 00:01:44 GMT<![CDATA[Reply to QMediaPlayer and QGraphicsVideoItem: unable to seek for a video file without audio thread on Thu, 30 Oct 2014 10:47:57 GMT]]>I changed the topic and described my problem globally.

]]>https://forum.qt.io/post/249534https://forum.qt.io/post/249534Thu, 30 Oct 2014 10:47:57 GMT<![CDATA[Reply to QMediaPlayer and QGraphicsVideoItem: unable to seek for a video file without audio thread on Wed, 29 Oct 2014 23:38:37 GMT]]>Hi,

Do you have gstreamer for Windows, installed somewhere ?

]]>https://forum.qt.io/post/249477https://forum.qt.io/post/249477Wed, 29 Oct 2014 23:38:37 GMT