https://bugs.kde.org/show_bug.cgi?id=431181

            Bug ID: 431181
           Summary: Batch script generates overly long black_track
                    producer
           Product: kdenlive
           Version: 20.12.0
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Video Display & Export
          Assignee: j...@kdenlive.org
          Reporter: tho...@junovagen.se
  Target Milestone: ---

Created attachment 134574
  --> https://bugs.kde.org/attachment.cgi?id=134574&action=edit
MLT-file with too long black_track producer (23 min i.s.o. 1:50)

SUMMARY

If you generate a batch script and run it you will get a long sequence of only
black image after the actual video.

This seems to be caused by the black_track producer having the wrong length.
See a description of the problem in this YouTube video:  
https://www.youtube.com/watch?v=C0oeZAUjlbw

STEPS TO REPRODUCE
1. Start a new project and add a short clip
2. Generate a script file
3. Start the script

OBSERVED RESULT
The generated video is 10-20 minutes longer than the clip with only black at
the end.

EXPECTED RESULT
A video containing the clip without extra black.

SOFTWARE/OS VERSIONS
Windows: 10
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 
Melt Version: 6.25.0

ADDITIONAL INFORMATION
Seems that earlier versions did not generate any end times for the black_track,
but the last few versions does.

I've seen https://bugs.kde.org/show_bug.cgi?id=415146, which to me seems to
describe the problem, but was closed.

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