urisourcebin/dashdemux: Multi-period playback problem

Submitted by Seungha Yang

Link to original bug (#768900)

Description

Playbin3 based dash playback has problem on multi-period case.

I guess that current urisourcebin expects following sequence will happen
[dashdemux found next period] -> [add new srcpad] -> [push eos to old srcpad]
Is it correct understanding?

The problem on current playbin3 based dash multi-period is that,
a srcpad of dashdemux push eos before the dashdemux constructs new srcpad...
So, urisourcebin pass it to downstream.
What is correct approach for this? I think dashdemux may delay pushing EOS if next period exist.

It can be reproduced using this commend, period change at around 4min.
gst-play-1.0 http://dash.edgesuite.net/dash264/TestCases/5a/nomor/1.mpd