While playing a video (.mkv and .mp4) the subtitles are not displayed even though the subtitles track is visible in the subtitle drop down in settings. The only workaround is that if the video has more than one subtitle then select the track 2 and then select the track 1, the subtitles will be displayed then. (video attached). 

Steps to reproduce:

1. Open example "multimedia/video/mediaplayer" (Qml Video player example)
2. Build it and run it
3. Open a video which has subtitles attached to it (test video also attached)
4. Run the video
5. Go to settings and select the other track and then again select the first track
6. The subtitles are displayed now

Expected Output:

The subtitles are displayed from the beginning without any workaround.

Actual Output:

The subtitles are not displayed when the video is played.

Note: If the video has only one subtitle track then there is no way to display the subtitles.