Video not showing on mobiles

Hello,

I have a website on which I placed a video loaded straight from the media library (not embedded from YouTube).

Website width: 1920 px
Body Width: 1100 px
Video Position: a DIV of half body width
Video details: MP4 of 1280x720 px

Video settings in BB are set to visible on every device size. Video doesn’t show on mobiles, whether in portrait or landscape mode.

I have the latest versions of BB (+BB Child) and BB Themer.

I am assuming there must be some glitch between video size (width) and break points, but the video is working fine when its container is over hald as small as its width.

Can anyone help, please?

Thank you
Frederic