qtdemux: set seqnum to segment event in push mode
Submitted by Wonchul Lee
I found that when playing media using qtdemux in pull mode (streaming), the seqnum of the relevant events after seek is different from seqnum of the seek event.
Seqnum of segment is only used when seeking in pull mode. In push mode, the seek
event is processed by the upstream source element, so this value is never used.
I fixed to apply seqnum of segment event sent from the upstream in push mode.