I at least found the equivalent to the other method you showed. the only thing is that haven't been able to figure out how to apply it.

gst_base_parse_set_pts_interpolation(GstBaseParse,gboolean);

<a href="https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseParse.html#gst-base-parse-set-pts-interpolation" target="_top" rel="nofollow" link="external">GstBaseParse</a> 

        
        
        <div class="signature" style="margin-top:1em;color:#666666;font-size:11px;">
                                ------------------------------
<br/>Gstreamer 1.14.1
<br/>------------------------------
<br/>Windows
                        </div>
<br/><hr align="left" width="300" />
Sent from the <a href="http://gstreamer-devel.966125.n4.nabble.com/">GStreamer-devel mailing list archive</a> at Nabble.com.<br/>