[Bug 736421] dashdemux: improve detection of the position on download restart

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=736421
  GStreamer | gst-plugins-bad | 1.4.1

--- Comment #2 from Thiago Sousa Santos <thiagossantos at gmail.com> 2014-09-10 18:51:50 UTC ---
Created an attachment (id=285859)
 View: https://bugzilla.gnome.org/attachment.cgi?id=285859
 Review: https://bugzilla.gnome.org/review?bug=736421&attachment=285859

mssdemux: improve position detection when a download restart

The same patch is appliable to mssdemux, attached it.

hlsdemux doesn't need as it only has one output pad for now.

But before merging, I'd like to know why/where does the pad query fail to
see if we can fix that. Can you get a log with it failing?

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