I am trying to bring audio and video sync by de-muxing audio and video from a single MPEG-2 TS file and playing audio in one setup and video in one setup. In order to bring the sync the clock source for the pipelines should be synchronized. The system clocks in my set up are synchronized via 1588 PTP Protocol. Please let me know how to change the gst-pipeline source clock. By default the gst source clock is the video pll or the VPU clock.