[Bug 790821] New: m3u8: Parse and use AVERAGE-BANDWIDTH attribute if available

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790821

            Bug ID: 790821
           Summary: m3u8: Parse and use AVERAGE-BANDWIDTH attribute if
                    available
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: hosang10.lee at lge.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

The AVERAGE-BANDWIDTH attribute in the EXT-X-STREAM-INF tag represents the the
average segment bit rate of the Variant Stream, while the BANDWIDTH attribute
represents the peak segment bit rate of the Variant Stream.
(https://tools.ietf.org/html/draft-pantos-http-live-streaming-23#section-4.3.4.2)
Using the average bit rate instead of the peak bit rate for variant switching
is more efficient and appropriate. Sometimes due to VBR encoding, the BANDWIDTH
may represent a value way above the average bit rate, which could result to
players not switching to that variant stream although network bandwidth is
sufficiently available.

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