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Fix live delay computation

Vinay Rosenberg requested to merge github/fork/fraunhoferfokus/fix-liveDelayComputation into development

Created by: dsilhavy

The goal of this PR is to fix/adjust live delay calculation:

  • Fix live delay calculation for SegmentTimeline manifests for which no valid segment request could be generated with the initial live delay. Increase live delay until a valid segment is found instead of starting playback at the beginning of the DVR window
  • When live delay is different from the value initially calculated by computeLiveDelay it gets adjusted in StreamProcessor.findRequestForLiveEdge -> playbackController.setLiveDelay
  • If the live delay should be a multiple of the fragment duration use @maxSegmentDuration for multiperiod manifests. For single period manifests iterate through the available AdaptationSets and use the largest segment duration.

This PR is supposed to fix #3227 (closed) and #3146 (closed)

Known Issues: For SegmentTimeline manifests the fragmentDuration is currently NaN. Related to #3284

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