I'm having a crash when lauching the game.

When I click the "Play" button, I expect the game to launch.

When the download is finished (just before Minecraft starts -but Minecraft doesnt start), the launcher reappears instantly and there is an error in the Launcher logs.

I give you the Launcher log, the game output and a film to see what's happening.

I'm using Minecraft for a while, first time having this problem. Don't hesitate asking me questions, I'll answer as fast as I can.