[Bug 765096] baseparse: When initializing DTS from PTS, remember that we did so

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765096

--- Comment #1 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 326082
  --> https://bugzilla.gnome.org/attachment.cgi?id=326082&action=edit
baseparse: When initializing DTS from PTS, remember that we did so

If we don't store the value in prev_dts, we would over and over again
initialize the DTS from the last known upstream PTS. If upstream only provides
PTS every now and then, then this causes DTS to be rather static.

For example in adaptive streaming scenarios this means that all buffers in a
fragment will have exactly the same DTS while the PTS is properly updated. As
our queues are now preferring to do buffer fill level calculations on DTS,
this is causing huge problems there.

See https://bugzilla.gnome.org/show_bug.cgi?id=691481#c27 where this part of
the code was introduced.

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