[Bug 742979] adaptivedemux: Adaptive bitrate algorithm does not react to declining bitrate

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=742979
  GStreamer | gst-plugins-bad | git master

--- Comment #6 from A Ashley <bugzilla at ashley-family.net> 2015-01-20 11:24:28 UTC ---
Sebastian's algorithm would certainly make it more responsive to declining
bitrate without the need to keep track of previous fragments. We're currently
using that logic, but with the additional tweak of short-circuiting the three
fragment pre-load if the download speed is sufficiently high.

I still think it should try to avoid intentional underflow before starting a
download.

I wonder if we could do something like keep a track of the GstClockTime when
the most recently sent buffer will end (using PTS + duration?). A check of
(gst_clock_get_time() + estimated_download_time) <= last_buffer_end_time could
be used to detect potential underflow. However, I'm not sure if this logic
holds true if sync=false for the sink element.

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