event stream-start: GstEventStreamStart, flags=(GstStreamFlags)GST_STREAM_FLAG_NONE;
event caps: video/x-raw, format=(string)I420, width=(int)1080, height=(int)720, framerate=(fraction)1/1, chroma-site=(string)jpeg, colorimetry=(string)1:4:0:0;
event segment: format=TIME, start=0:00:00.000000000, offset=0:00:00.000000000, stop=0:00:02.000000000, flags=0x01, time=0:00:00.000000000, base=0:00:00.000000000, position=none
buffer: checksum=68cc0c0b6d6863a135f40297a54aec9f1593f34c, pts=0:00:00.000000000, dur=0:00:01.000000000

CHECKPOINT: Paused pipeline, now editing nested timeline and committing.

event flush-start: (no structure)
event flush-stop: GstEventFlushStop, reset-time=(boolean)true;
event segment: format=TIME, start=0:00:00.000000000, offset=0:00:00.000000000, stop=0:00:02.000000000, flags=0x01, time=0:00:00.000000000, base=0:00:00.000000000, position=none
buffer: checksum=9b42849e45e15981115cff9da00ecbf7afafd462, pts=0:00:00.000000000, dur=0:00:01.000000000