The bug is rarely reproduced if one changes the playback rate many times. Note, media player is able to continue playing if one calls player.pause and player.play. Most likely, the bug is not reproduced unless the tested video has audio track.

Steps:

      - Just run tst_QMediaPlayerBackend::multiplePlaybackRateChangingStressTest with windows backend. https://codereview.qt-project.org/c/qt/qtmultimedia/+/428720

      - See commented code in the test, it could help to sort out the problem.

or

    - run examples/video/mediaplayer

    - open a pretty long (1min and more) video with sound.

    - manually change the playback rate as fast as possible.