upload: add static mp4 check

[gioelecerati]

• Add staticMp4 check to create mp4s when specified even when longer than maxDuration

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main        #244   +/-   ##
==========================================
  Coverage        ?   16.45642%           
==========================================
  Files           ?          16           
  Lines           ?        1744           
  Branches        ?           0           
==========================================
  Hits            ?         287           
  Misses          ?        1431           
  Partials        ?          26           

Files	Coverage Δ
task/upload.go	15.79892% <0.00000%> (ø)

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Files	Coverage Δ
task/upload.go	15.79892% <0.00000%> (ø)