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dashdemux: include both Period start and presentationTimeOffset in segment start

Alex Ashley requested to merge alexashley/gst-plugins-bad:issue841-presentation-time-offset into master

The start of each segment is relative to the Period start, minus the presentation time offset.

As specified in section 5.3.9.6 of the MPEG DASH specification: The value of the @t attribute minus the value of the @presentationTimeOffset specifies the MPD start time of the first Segment in the series.

dashdemux was not taking account of presentationTimeOffset and in some methods was not taking into account the Period start time. This commit modifies the segment->start value to always be relative to the MPD start time (zero for VOD, availabilityStartTime for live streams). This makes all uses of the segment list consistent.

Fixes #841 (closed)

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