i bypassed the problems : i am using a video without sound as a link and the same video with sound as an object.
That seems to be a bizarre idea - why are you doing this?
Also, you can hear a quick sound from one of the video when you open a new panorama in the same virtual tour?
i put 4 videos in one panorama and i can hear at the moment i open the panorama. The quick sound coming from one of the panorama
Audio seems to be a issue.
If you configure the video as the hotspot Display/Object the video will play as soon as it loads.
A video configured as a hotspot Link/Object will play when the hotspot is clicked.
Specifiying a video for the hotspot Display/Object and another video as the hotspot Link/Object just seems perverse.
And four videos in one pano scene.....have you considered how long they'll take to download?