Hi, I've created a custom video player using QMultimedia, that plays back certain video files that are to be post-processed frame-by-frame. The post-process depends on each video frame's start time. I'm using the Qt 5.1 beta release (I use the new desktop QML features).
I've created a video surface class that inherits QAbstractVideoSurface, register this in QMediaplayer, and I get each frame in my own implementation of QAbstractVideoSurface::present. On Linux, this works flawlessly, each QVideoFrame have proper values for QVideoFrame::startTime() and endTime(). However on windows, start- and endtimes are always -1 (invalid). I try now to look up the current position in the mediaplayer each time present is called, but this is not really precise enough. Anyone know how to make this work? I've tried various video file formats but they all give the same -1 values. Maybe there is a bug in the windows backend (WMF?). I tried looking into the source code - at first glance it looks allright (mftvideo.cpp at line 638), but while googling further into it I found this page here, http://msdn.microsoft.com/en-us/library/windows/desktop/bb530107(v=vs.85).aspx <http://msdn.microsoft.com/en-us/library/windows/desktop/bb530107%28v=vs.85%29.aspx> where further calculations are needed as the sample times are relative to a "presentation clock", so maybe it can't work like it's implemented now? Best regards Ola _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest