[Bug 787300] New: basesink: Add property to handle seamless-seek by sink

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787300

            Bug ID: 787300
           Summary: basesink: Add property to handle seamless-seek by sink
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: pudding8757 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

There seems to no way to set segment.rate immediately in pipeline without
flush.
To mimic the feature, there might be 2 options but seems ugly for me.
- Reduce queue size in pipeline as much as possible and use non-flush seek.
- Adjust clock maybe??

Another option is that make use of step event but originally step event is not
for this feature. So we need more pretty way to change rate immediately.

One of use case of this rate change is, Youtube rate change which is perfectly
seamless.

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