media sound component synchronization

Hi,
I’ve got a problem while displaying a media texture on a plane with a media sound component spawned at beginplay, the sound keeps being more or less desynchronized. I’ve tried “Dynamic Rate Adjustment” parameters but it’s still not synchronized. Any advices ?
The level consists in a wide plane displaying a media texture with sound. Used in VR, with no interaction of the pawn. The played file is a 18.4Mo .mp4 file, 45003800px, 30 fps, 1’18", less than 2000Kbits/s compression.

So, looks like it’s synchronized… The dynamic rate adjustment seems to adjust the VIDEO rate to match the sound one. Don’t know if this is what should happen but it works most of the time (in packaged game, with no editor running in background).