QML Media player example - Changing the audio/video/subtitles track causes hiccups in the audio

Description:

Changing the audio/video/subtitles track while a media is playing causes hiccups on the audio being played.
Steps to reproduce:

1. Open the QML media player
2. Open any file that contains an audio, a video and subtitles tracks
3. Click play
4. Change the tracks of audio/video/subtitles, this will cause hiccups in the audio

Expected behavior:

Changing any type of track should not create hiccups in the audio.
Observed behavior:

Changing audio/video/subtitles track while the media is playing will cause the audio to experience some hiccups.
Special notes: