[Bug 643847] New: deinterlace: Add support for deinterlacing using buffer caps/flags

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=643847
  GStreamer | gst-plugins-good | git

           Summary: deinterlace: Add support for deinterlacing using
                    buffer caps/flags
    Classification: Desktop
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: robert.swain at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
      GNOME target: ---
     GNOME version: ---


When not using the fieldanalysis element immediately upstream of deinterlace,
    behaviour should remain unchanged. fieldanalysis will set the caps and
flags on
    the buffers such that they can be interpreted and acted upon to produce
    progressive output.

    There are two main modes of operation:

    - Passive pattern locking
      Passive pattern locking is a non-blocking, low-latency mode of operation
that
      is suitable for close-to-live usage. Initially a telecine stream will be
      output as variable framerate with naïve timestamp adjustment. With each
      incoming buffer, an attempt is made to lock onto a pattern. When a lock
is
      obtained, the src pad and output buffer caps will reflect the pattern and
      timestamps will be accurately interpolated between pattern repeats. This
      means that initially and at pattern transitions there will be short
periods
      of inaccurate timestamping.

    - Active pattern locking
      Active pattern locking is a blocking, high-latency mode of operation that
is
      targeted at use-cases where timestamp accuracy is paramount. Buffers will
be
      queued until enough are present to make a lock. When locked, timestamps
will
      be accurately interpolated between pattern repeats. Orphan fields can be
      dropped or deinterlaced. If no lock can be obtained, a single field might
be
      pushed through to be deinterlaced.

    Locking can also be disabled or 'auto' chooses between passive and active
    locking modes depending on whether upstream is live.

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