Windows: Avoid WMF error with some specific video files

Some specific video files cause a WMF error when played, possibly due to
an issue in WMF, likely triggered by a non-standard setting in the
files. However, the video files play fine when the error is ignored,
which seems to cause no other issues.

Fixes: QTBUG-100835
Pick-to: 6.3 6.2
Change-Id: I7227c0bfbe3c1504e57ce3aec1c92c433879e618
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/plugins/multimedia/windows/player/mfplayersession.cpp b/src/plugins/multimedia/windows/player/mfplayersession.cpp
index d64ece5a7..544567e5b 100644
--- a/src/plugins/multimedia/windows/player/mfplayersession.cpp
+++ b/src/plugins/multimedia/windows/player/mfplayersession.cpp
@@ -1639,6 +1639,14 @@ void MFPlayerSession::handleSessionEvent(IMFMediaEvent *sessionEvent)
         changeStatus(QMediaPlayer::InvalidMedia);
         break;
     case MEError:
+        if (hrStatus == MF_E_ALREADY_INITIALIZED) {
+            // Workaround for a possible WMF issue that causes an error
+            // with some specific videos, which play fine otherwise.
+#ifdef DEBUG_MEDIAFOUNDATION
+            qDebug() << "handleSessionEvent: ignoring MF_E_ALREADY_INITIALIZED";
+#endif
+            break;
+        }
         changeStatus(QMediaPlayer::InvalidMedia);
         qWarning() << "handleSessionEvent: serious error = " << hrStatus;
         emit error(QMediaPlayer::ResourceError, tr("Media session serious error."), true);