Changing the number of steps/thumbnails in the Video Storyboard

All is in the question: How can I change the number of thumbnails, of steps, created by the storyboard?

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You must actually add some keys (parameters and parameter) to the videoStoryBoard converter. For example, here, we want 4 thumbnails instead of the default 9. This is the XML to be added to your Studio project (create a new XML extension in Project > Advanced Settings > XML Extensions):

<extension target="org.nuxeo.ecm.core.convert.service.ConversionServiceImpl"

  <converter name="videoStoryboard"
    <!-- Here, we must explicitely reuse all the existing values 
         as declared in the original videoStoryboard XML converter

    <!-- Adding this parameters/parameter tag does the thing -->
      <parameter name="thumbnail_number">4</parameter>
       <parameter name="width">100</parameter>
       <parameter name="height">62</parameter>

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