[Bug 733959] hlsdemux: download bitrate algorithms don't reflect real download rate

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=733959

--- Comment #62 from Duncan Palmer <dpalmer at digisoft.tv> ---
Using the bitrate reported by queue2 is the correct way to retrieve the bitrate
for the current fragment. However, c98348c1 averages bitrate over several
fragments and uses this average to decide when to switch up variant, as opposed
to the bitrate of the last fragment, which it uses to decide when to move down.

We carry some further changes internally which introduce hysterisis to prevent
continuous up/down switches when the average bitrate sits around the switching
point. See https://bugzilla.gnome.org/show_bug.cgi?id=747558. I can do the work
to upstream this + restore the behaviour from c98348c1 if you'd like.

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