event stream-start: GstEventStreamStart, flags=(GstStreamFlags)GST_STREAM_FLAG_NONE, group-id=(uint)1, stream=(GstStream)"\(GstStream\)\ videotestsrc_stream_0";
event caps: video/x-raw, format=(string)A444_16LE, framerate=(fraction)30/1, height=(int)1080, interlace-mode=(string)progressive, multiview-mode=(string)mono, pixel-aspect-ratio=(fraction)1/1, width=(int)1920;
event stream-collection: stream-collection, collection=(GstStreamCollection)"\(GstStreamCollection\)\ unparented";
event segment: format=TIME, start=0:00:00.000000000, offset=0:00:00.000000000, stop=none, time=0:00:00.000000000, base=0:00:00.000000000, position=0:00:00.000000000
event eos: (no structure)
