There are duplicate frames when cutting and further gluing adjacent segments

Submitted by Oleg

Description

Created attachment 373767
output file via Pitivi

Hi!
I want to cut and then combine to segments from original file (duration of file is 2.569 seconds)

I use next command line for it:
ges-launch-1.0 +clip input.mkv inpoint=0 duration=1.5 +clip input.mkv inpoint=1.5 duration=1.5 -o output.via.ges-launch.ogv

and I use Pitivi also.

In both cases, the output file contains the jerks of the image at the glue point (see attachment).

Attachments can be downloaded here (a total of about 6 megabytes):
https://yadi.sk/d/etFcfITZCm-qvQ

input.mkv - original file
output.via.Pitivi.mp4 - output via Pitivi
output.via.ges-launch.ogv - output via ges-launch

What is the problem and how can I avoid it.
Big thanks!

Attachment 373767, "output file via Pitivi":
output.via.Pitivi

Version: 1.14.x