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