GstStreamType describes a high level classification set for
flows of data in gstreamer.Stream objects.
Note that this is a flag, and therefore users should not assume it
will be a single value. Do not use the equality operator for checking
whether a stream is of a certain type.
The stream is of unknown (unclassified) type.
The stream is of audio data
The stream carries video data
The stream is a muxed container type
The stream contains subtitle / subpicture data.