def callback(track_transfer_batch, mediatype, profile, user_param1, ...)

Emitted to allow configuration of encoding profile settings (mostly by setting presets on sub-profiles).

track_transfer_batch :

instance of RB.TrackTransferBatch that is emitting the signal

mediatype :

the target media type

profile :

the GstEncodingProfile

user_param1 :

first user parameter (if any) specified with the connect() method

... :

additional user parameters (if any)