[Development] Broken class in the Qt Multimedia module

Saether Jan-Arve Jan-Arve.Saether at digia.com
Mon Dec 10 11:43:45 CET 2012

Please report the error issues on the bugtracker.

After a quick google, it seems that the CPXCInfoShlExt stuff come 
from a PDF-XChange shell extension, and I don't understand why
such a shell extension is invoked when you try to playback video.

Maybe you get these messages when you open the file dialog?

Jan Arve

> -----Original Message-----
> From: development-bounces+jan-arve.saether=digia.com at qt-project.org
> [mailto:development-bounces+jan-arve.saether=digia.com at qt-project.org]
> On Behalf Of Sze Howe Koh
> Sent: 8. desember 2012 04:35
> To: development at qt-project.org
> Subject: [Development] Broken class in the Qt Multimedia module
> Hi all,
> I tried out the VideoWidget example (MSVC 2010 version of Qt 5 RC1), on
> Win7 32-bit), and found that it is broken. I inserted qDebug() calls
> immediately after QMediaPlayer::setMedia() and QMediaPlayer::play().
> Here are the results:
> * .avi files seem to load (I got no error messages), but wouldn't play.
> * .mov files play properly... BUT I got a error messages anyway
> (QMediaPlayer::ResourceError -- "Failed to load source.")
> * .mpg file gave the QMediaPlayer::ResourceError upon loading
> * I got no error messages when trying to load a spreadsheet file
> * I never ever got error messages after QMediaPlayer::play(), even if
> the playing fails
> * QMediaPlayer emits a stateChanged() signal after calling play(),
> even if the playing fails
> * Sometimes, I get strange messages that refer to a path that's non-
> existent on my machine:
> "e:\workprg\pdf35\trunk\xcshinfo\PXCInfoShlExt.h(57) : Trace/s :
> CPXCInfoShlExt::FinalConstruct
> e:\workprg\pdf35\trunk\xcshinfo\PXCInfoShlExt.h(77) : Trace/s :
> CPXCInfoShlExt::FinalRelease"
> All the video files above play normally with Windows Media Player, so
> it's not a system codec issue. This isn't just about media format
> support though; the error-handling facilities of QMediaPlayer are
> broken. This is a problem for Qt 5, as QMediaPlayer is under an
> "Essentials" module.
> On that vein, Gerrit activity for the qtmultimedia repo has been very
> low recently -- do we still have a maintainer?
> Regards,
> Sze-Howe
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