[Bug 772143] qtmux: Don't calculate PTS offset and DTS with GST_CLOCK_TIME_NONE

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772143

--- Comment #1 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 336473
  --> https://bugzilla.gnome.org/attachment.cgi?id=336473&action=edit
qtmux: Don't calculate PTS offset and DTS with GST_CLOCK_TIME_NONE

The current code assumes that there is always a PTS, which is not
necessarily true. Handle the cases where either PTS or DTS are not
available, and error out properly if neither are, instead of calculating
completely wrong values.

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