On Windows 7, Media Foundation is the default backend. DirectShow is the default only on Windows XP (or with MinGW-built Qt on any version of Windows). The problem with Media Foundation is its limited codec support, see http://msdn.microsoft.com/en-us/library/windows/desktop/dd757927(v=vs.85).aspx . DirectShow doesn't have this problem and virtually supports anything (through third-party codecs).
Because of this, we are planning to do like Windows Media Player and implement a dynamic backend selection that would pick the one supporting the media the user wants to load. You can track this task there https://bugreports.qt-project.org/browse/QTBUG-32783 As for the original problem, it might be a missing codec or a bug... If you want support for more codecs, you should force Qt to use the DirectShow plugin. You'll either have to use the MinGW packages or get the Qt sources ('stable' branch) and configure Qt with '-no-wmf-backend'. Yoann Lopes Senior Software Engineer - Digia, Qt Visit us on: http://qt.digia.com On Sep 12, 2013, at 6:57 AM, Mandeep Sandhu wrote: The trick is this, I can put this on several different machines - all are Windows 7 Pro: 1.) machine 1 - development box, can play some mp4s but not others (all h264) 2.) machine 2 - personal household box, will play the sampleFile mp4 sometimes 3.) machine 3 - COMPLETELY clean windows 7 pro install, aside from the code above, has nothing installed on it, NEVER plays the mp4. All 3 machines can play the sampleFile.mp4 in Windows Media Player. As a final note, none of these will play FLV either. Pointers anyone? What am I missing here? QtMultimedia relies on 'backends' to work on different OS'. For Windows I think it uses 'DirectShow'. Is that installed and working properly on the machines you're trying? Here's more detail on the state of art: http://qt-project.org/wiki/Qt_Multimedia_Backends Places where video is not playing, it's possible that there's no support for the codec/container in the backend being used (DirectShow or some other). HTH, -mandeep Thanks! -Jason _______________________________________________ Interest mailing list Interest@qt-project.org<mailto:Interest@qt-project.org> http://lists.qt-project.org/mailman/listinfo/interest _______________________________________________ Interest mailing list Interest@qt-project.org<mailto:Interest@qt-project.org> http://lists.qt-project.org/mailman/listinfo/interest
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