Video SP should let you play an MP4 OBJ without creating and storing a derivative.

Currently, only the 'MP4' datastream is ever sent to a viewer.

If you are uploading MP4s it seems unnecessary (and processor-expensive) to create and store another MP4.

There is currently an admin option to "not create MP4 derivative", but nothing else gets a chance to be passed to the player.

For this immediate use case, we could check if the MP4 datastream is missing, and if the OBJ is playable, use that instead.