Video Background 7.1 Pixelated on Mobile

Site URL: https://www.elabuelorafael.es/

Hi,

We are trying to make a "Landing" page on Squarespace 7.1 using a regular page.

The idea is just having a video on the background and some text on top. We also included a "contact" button on top. 

Then, we also added some code to hide the header while this landing page will be running. 

Everything seems to work, however, the video looks really pixelated when using a phone. The current video is 6 seconds long and it is just 2Mb. The format is .mp4. The desktop version works perfect on the laptop and on the Ipad. However, when going into the phone, the video looks quite pixelated. It charges really fast, but the quality is poor. 

When checking on the google chrome developers tool for "responsive" devices, it also looks perfect.

Any idea of what could be happening? 

(I also tried the video in another regular section of the website and it happens the same, so it is not related to the landing page itself)

I hope any of you could help me with this. Thank you very much in advance 🙂