Whether frameRate is a drop frame rate.
Frame rate of the reference video flow, as a "numerator/denominator" fraction so the exact
rational rate survives. Audio only media counts in hundredths of a second instead, as elsewhere
in the player.
Whether a video flow sets the timeline; drives the timecode format (FF vs hundredths).
Absolute flow time, in seconds, at which the loaded segments end.
Absolute flow time, in seconds, that media time 0 maps to.
What the loaded flows say about the media: where it sits on the absolute TAMS flow timeline, and how its timecode should be counted.
Media time is 0 based while TAMS timeranges are absolute, so every conversion between the two goes through mediaStartTime:
flowTime = mediaTime + mediaStartTime.