new_contents: import os
  from . import hooks
  from .viewport import playblast
  
  
  def default_handler(data, options):
  
      _, ext = os.path.splitext(data['filename'])
      is_qt = ext == '.mov'
  
      kwargs = dict(
          camera=data['camera'],
          state=data['state'],
          width=data['width'],
          height=data['height'],
      )
  
      if is_qt:
          kwargs.update(
              format='qt',
              compression='H.264',
              filename=data['filename'],
              sound=data['sound'],
          )
      else:
          # PNG settings
          # No sound
          # .png extension removed
          kwargs.update(
              format='image',
              compression='png',
              filename=data['filename'].rsplit('.', 1)[0],
          )
  
      playblast(**kwargs)
  
  
  hooks.register_extension(
      name='h.264',
      ext='.mov',
      handler=default_handler,
  )
  
  hooks.register_extension(
      name='png',
      ext='.png',
      handler=default_handler,
  )
  
subject: Implement h264 and png as ext hooks