pkt_pts=0|tag:lavfi.readvitc.found=0
pkt_pts=1|tag:lavfi.readvitc.found=1|tag:lavfi.readvitc.tc_str=05:01:02:21
pkt_pts=2|tag:lavfi.readvitc.found=1|tag:lavfi.readvitc.tc_str=05:01:02:22
pkt_pts=3|tag:lavfi.readvitc.found=1|tag:lavfi.readvitc.tc_str=05:01:02:23
pkt_pts=4|tag:lavfi.readvitc.found=0