frame:0 pts:0 pts_time:0
lavfi.block=46.592525
frame:1 pts:1 pts_time:1
lavfi.block=40.478703
frame:2 pts:2 pts_time:2
lavfi.block=40.858681
frame:3 pts:3 pts_time:3
lavfi.block=39.519077
frame:4 pts:4 pts_time:4
lavfi.block=38.713215