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Dash-Industry-Forum / Events

Addresses discussions around Event Processing and APIs
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[EventAPI]how to signal unknown duration #15

Closed RufaelDev closed 5 years ago

RufaelDev commented 5 years ago

How to signal unknown duration in the eventAPI ? could one use the value 0xFFFFFFFF ? One could use zero duration ?

irajs commented 5 years ago

Form 23009-1: 1) For emsg: "event_duration provides the duration of event in media presentation time. In version 0-, the timescale is indicated in the timescale field; in version 1, the timescale of the MovieHeaderBox is used. The value 0xFFFF indicates an unknown duration."

2) For Event@duration: "specifies the presentation duration of the event. The value of the duration in seconds is the division of the value of this attribute and the value of the @timescale attribute. If not present, the value of the duration is unknown."

0 is valid as a duration value. Therefore it seems we need to use xFFFFFFFF for unknown duration.

irajs commented 5 years ago

[F2F meeting] we take out @timescale in EventAPI. The parameters duration and presentationtime is passed in msec,

irajs commented 5 years ago

Both are implemented: removal of timescale and maximum value for duration when duration is unknown.