fix: added script for video `duration` update

[haddercone]

PR Fixes:

• 1 Added script for updating video metadata duration
• 2

Resolves #390

Checklist before requesting a review

• [X] I have performed a self-review of my code
• [X] I assure there is no similar/duplicate pull request regarding same issue

[haddercone]

Can u remove all the lock file changes?

done!