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The metadata zoom value can be adjusted by placing the file zoom-calibration.xml in the same folder as the video file.

It should have the following contents:

<config>
   <key name="MaxZoom" value="160.2"/>
   <key name="MaxZoomMicronsInPixel" value="1.0"/>
 </config>

You can adjust pixel-to-micron ratio by changing number of microns in pixel (MaxZoomMicronsInPixel) at given zoom (MaxZoom) . An example calibration file can be downloaded here: zoom-calibration.xml