This stream should be selected by default. This flag may be used by demuxers to signal that a stream should be selected by default in a playback scenario.
This stream is a sparse stream (e.g. a subtitle stream), data may flow only in irregular intervals with large gaps in between.
This stream should not be selected by default. This flag may be used by demuxers to signal that a stream should not be selected by default in a playback scenario, but only if explicitly selected by the user (e.g. an audio track for the hard of hearing or a director's commentary track).
This stream has no special attributes