[Bug 759108] New: hlsdemux: add support for snapping seek flags

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759108

            Bug ID: 759108
           Summary: hlsdemux: add support for snapping seek flags
    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: dpalmer at digisoft.tv
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Seeking to a position which not near a segment boundary can result in the seek
taking quite a while to complete. There are a couple of scenarios;
- The bitrate of the connection not much more than the bitrate of the variant;
in this case, we have to wait for the data between segment start and seek
position to download before our initial frame can be decoded. This can take a
couple of seconds.
- The stream is high bitrate and/or encrypted, and we're running on a slow
embedded processor. So, even tho data before the start position is not decoded,
it still takes significant time to process it. Again, this can increase the
time taken to seek by the order of seconds.

This problem can be avoided by using the seek snap flags to seek to a segment
boundary only.

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