[Bug 696333] qtmux should use provided DTS and not make up its own

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=696333
  GStreamer | gst-plugins-good | git

--- Comment #6 from Matej Knopp <matej.knopp at gmail.com> 2013-04-23 20:31:16 UTC ---
For streams with bframes the first few buffers currently have invalid DTS
(because there is no way to express negative running/stream time). Muxer
doesn't check for -1, it takes current value and scales it, resulting in
invalid sample duration. Checking for GST_CLOCK_TIME_NONE and using 0 instead
fixes this (although proper fix would be to allow negative running time and
perhaps shift the timestamps using edit list atom)

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