[Bug 770707] New: decklinkvideosink drops frames after a while

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770707

            Bug ID: 770707
           Summary: decklinkvideosink drops frames after a while
    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: hfink at toolsonair.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 334605
  --> https://bugzilla.gnome.org/attachment.cgi?id=334605&action=edit
reproducing app

We have noticed a regression of decklinkvideosink on GIT master, where we get a
little bit of correctly playing frames (1 sec to a few seconds, varies between
reboots), then all frames are late and being dropped (the output freezes). This
happens only when we use large running times, i.e. base-time of zero, and
start-time set to None. I have attached an example application that reproduces
it (incl. debug log).

Reverting commit

commit 3b7e0d7de32f0728259d601daa13b9eeec3dd3ce
Author: Sebastian Dröge <sebastian at centricular.com>
Date:   Fri Aug 26 15:48:36 2016 +0300

    decklinkvideosink: Scale down scheduled frame times to milliseconds

... also makes it work again.

Using a normal base-time (with running-times starting at zero) also works
normally.

I have been using a Decklink 4K Extreme over HDMI out, 720p50 for testing.

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