360 video is jerky on Quest 3

I implemented a 360 video with media player. I would have high resolution so the video has 5760 x 5760 pixels (stereo over/under) with 30 frames and 50 Mbit.
Through the wohle video its jerky, it does not play smooth. If I open the same file with the native video player everything is fine, but not in my self implemented player.
A collegue says it could have to do with vulkan but since quest 3 does not support openGL vulkan is the only possibility.

Has anyone had the same experience and been able to solve the problem? Or does anyone have a tip what I can do to make the video run smoothly?