Synchronizing Live RTSP Sources

I am developing an application that decodes several RTSP feeds and extracts frames for some processing. It is important that the frames from the live RTSP feeds are synchronized as best as possible, and it is likely that the feeds will sometimes be unstable. Normally I use NVIDIA DeepStreams nvstreammux element to handle this sort of task, however, I was curious if there is a native gst element/method that I can use as well?