Strange thing, I have HL2EP2 content and other stuff, but spawning the media player on map just creates ERROR.
It also comes with lua errors.

[Media Player] lua/entities/mediaplayer_base/shared.lua:6: attempt to call global 'Model' (a string value)
1. unknown - lua/entities/mediaplayer_base/shared.lua:6
2. include - [C]:-1
3. unknown - lua/entities/mediaplayer_base/init.lua:7

[Media Player] lua/entities/mediaplayer_tv/shared.lua:21: attempt to call global 'Model' (a string value)
1. unknown - lua/entities/mediaplayer_tv/shared.lua:21

[Media Player] lua/entities/mediaplayer_base/shared.lua:6: attempt to call global 'Model' (a string value)
1. unknown - lua/entities/mediaplayer_base/shared.lua:6
2. include - [C]:-1
3. unknown - lua/entities/mediaplayer_base/cl_init.lua:1 .

EDIT: And yes, I'm using Chromium branch.