Full screen mp4 file in the browser

[raub21]

I am using the following command to play a mp4 file in the browser:
`{
"entity_id": "media_player.samsungtv",
"media_content_type": "url",
"media_content_id": "FILE_URL",
}
It plays fine but not in full screen. I have to click on the full screen icon to play it that way. I would like to know if there is another option to make it play full screen automatically.
Thank yo