deinterlace make m3u8 duration change from 10s to 5s

[zhangping]

add deinterlace after video decode:
... mpeg2dec ! queue ! deinterlace ! queue ! appsink name = video

the output segment duration is 5s, but it's 10s in job file:
"segment-duration" : 10.00

0:00:06.970572065 30100 0x7fe468020980 ERROR gstreamill livejob.c:575:notify_function: add segement 0.ts
0:00:11.991578931 30100 0x7fe468020c90 ERROR gstreamill livejob.c:575:notify_function: add segement 5770853909.ts
0:00:17.011150355 30100 0x7fe46800c900 ERROR gstreamill livejob.c:575:notify_function: add segement 10770734416.ts
0:00:22.015128171 30100 0x7fe46c004520 ERROR gstreamill livejob.c:575:notify_function: add segement 15770611535.ts

[zhangping]

deinterlace output buffer have invalid duration. The difference between the pts of two adjacent buffer is 40ms, but the duration of buffer is 80ms.

[zhangping]

gstreamer bug