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DASH-IF player cannot properly render ttml with multiple lines

Created by: faiyeah

Issue observed: In 1.5.1 player, 2 out of 4 lines are rendered in the player. (as attached as 1_5_1_2_lines_only) In 2.1.0 player, 1 and a half lines out of 4 lines are rendered in the player. (as attached as 2_1_0_1_and_a_half_line_only)

Expected behavior: All 4 lines are fully rendered and displayed in the player.

Player that can reproduce the issue: http://dashif.org/reference/players/javascript/v1.5.1/samples/dash-if-reference-player/ http://dashif.org/reference/players/javascript/v2.1.0/samples/dash-if-reference-player/

Content that can reproduce the issue: (as attached as 4lines.zip)

Thanks! Ryan Chan 4lines.zip