When enabled, appsrc will check GstSegment in GstSample which was pushed via gstapp.app_src.AppSrc.pushSample or "push-sample" signal action. If a GstSegment is changed, corresponding segment event will be followed by next data flow.
FIXME: currently only GST_FORMAT_TIME format is supported and therefore GstAppSrc::format should be time. However, possibly #GstAppSrc can support other formats.
Get handleSegmentChange property.