[ Version ( since = "1.2" ) ]
public void set_group_id (uint group_id)
Sets the group id on the stream-start message.
All streams that have the same group id are supposed to be played together, i.e. all streams inside a container file should have the same group id but different stream ids. The group id should change each time the stream is started, resulting in different group ids each time a file is played for example.
MT safe.
| this |
the message |
| group_id |
the group id |