This refers to the situation in 2011-05, which according to mobile.de officialy might change in the near future.
- You need to be a mobile.de “Profi-Account” user to add videos to your offers.
- There is a “Foto-Show” feature, but this is different from the real “video” feature; it displays the images you uploaded to mobile.de as a slideshow and is generated automatically for a vehicle if you are a Profi-Account user and uploaded 5 or more images to a vehicle.
- For “real” videos, it is impossible to add them via a HTML form when creating offers directly on mobile.de. It is only possible by using the data import interface; but that might change in the future, depending on user demand [source; to access this, you must be logged in with your mobile.de account].
- Now, to transfer a video URL with the “data import interface” to mobile.de, you can use a third-party data service provider. However, it is also possible to use the FTP or HTTP interface oneself (after getting individual permission for that; contact customer support for that). Refer to the mobile.de FTP / HTTP interface documentation on how to import your video URLs. If the above link is gone, you can find the documentation at: mobile.de -> Händlerbereich -> Anbieten -> Schnittstelle -> Schnittstelle (Anleitung) -> Technische Dokumentation (PDF).