Media Player bug on FFMPEG backend, position changes freeze the video after first loop

Hi there,

The attached project, works as expected on Qt 6.5.3, but it doesn't on Qt 6.5.4 onwards.

If you have a MediaPlayer QML item with loops higher than one, after the player complete one loop (one reproduction of the whole video) any change on position makes the video freeze for short or long time (I guess depending on the video length).

The demo app has a  "To End" button in case you can test with a long video, attached is also a short one with a big text on the last frame to be aware of it.

To reproduce the bug, simply press "Choose video..." button to load a video, then wait until the end of press the "To End" button, after this press the "Set random pos" button and it will move the mediaplayer video to that position, in Qt 6.5.4 onwards it will produce the mentioned lag.