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Dynamic Metadata

Category: Clip Library

This article covers features which are only available in Silverstack XT and Silverstack Lab.

Silverstack XT and Silverstack Lab come with a “Dynamic Metadata” panel that allows to extract dynamic metadata for supported clip formats.  Dynamic metadata refers to certain metadata information that changes over the time span of a clip (e.g. like TC which can also be considered dynamic). It is stored differently in diverse formats and therefore needs a special process to be accessed.

 

Fig. 1: The dynamic metadata panel in the upper left corner of the Silverstack UI

Fig. 1: The dynamic metadata panel in the upper left corner of the Silverstack UI

Supported Clip Formats

The following clip formats are currently supported for the extraction of dynamic metadata in Silverstack XT and Lab:

  • ARRIRAW (.ari sequences and in .mxf container)
  • ARRI Prores
  • REDRAW
  • SONY XAVC
  • SONY X-OCN
  • SONY RAW

Available Dynamic Metadata

The main part of dynamic metadata is dynamic lens metadata:

  • Focal Length
  • Aperture (T-Stop)
  • Focus Distance

For ARRI ProRes and ARRIRAW clips Silverstack XT and Lab also support:

  • Camera Tilt
  • Camera Roll

How to Extract Dynamic Metadata

Select the third icon displaying a horse in the left sidebar above the library (see fig. 1)

To extract dynamic metadata for the selected clip press the “Extract Dynamic Metadata” button in the middle of the dynamic metadata panel.

You can start the extraction of dynamic metadata for multiple clips by selecting an entry from the gear menu in the toolbar:

Fig. 2: Extract dynamic metadata for multiple clips

Fig. 2: Extract dynamic metadata for multiple clips

The extraction process for all clips can be monitored in the popover that reveals the current extraction state for every started clip:

Fig.3: Extracting dynamic metadata from multiple clips

Fig.3: Extracting dynamic metadata from multiple clips

After a successful extraction the dynamic metadata panel reveals the extracted dynamic lens and camera metadata:

Fig. 4: The dynamic metadata panel with successfully extracted metadata

Fig. 4: The dynamic metadata panel with successfully extracted metadata

The metadata can now be inspected during playback or while scrubbing through a clip.

For completeness concerning lens metadata three additional static fields have been added to the lower section of the panel:

  • Lens
  • Filter
  • ND Filter

They mirror data from the library and can also be edited in the General Info of the right sidebar.

Using Extracted Dynamic Metadata for Reports

For clips that support the extraction of dynamic metadata Silverstack extracts the dynamic metadata of the first frame already on ingest. That also allows Silverstack users to benefit from the dynamic metadata functionality and receive lens and other dynamic metadata for the first frame.

The additional lens fields can be exported to clips reports to enhance their information.

Silverstack XT and Silverstack Lab provide an extended functionality to leverage the dynamic metadata for generic clips reporting.

In the “Media” preferences it is possible to make sure that the static representation of the extracted dynamic metadata, that is used for the General info and table view library, follows the thumbnail frame:

Fig. 5: Using the extracted dynamic metadata of the thumbnail frame for reports

Like this you can make sure that the metadata that is referenced in the reports goes along with the shown thumbnail.

The focus distance unit can also be changed at the same position and allows to choose the display of the focal length in the dynamic metadata panel and the General Info to be imperial (inches/feet) or metric (millimeters/meters).

Export of Dynamic Metadata to a CSV File

After successfully extracting the dynamic metadata from a clip, you can export the per frame metadata to one csv file per clip.

To trigger the export select the entry “Dynamic Metadata (CSV)…” in the Export menu of the toolbar:

Export dynamic metadata to a CSV file

In the subsequent step only the clips are shown that have successfully extracted metadata. You can check in the table view column “Dynamic Metadata” if a clip has extracted dynamic metadata successfully:

The two clips on top have successfully extracted metadata, the two on the bottom don’t

Here’s an example of a dynamic metadata CSV file where you can also see the available columns:

The unit of the column “Focus Distance” depends on the setting available in the application preferences.

Dynamic Metadata Burn Ins

Silverstack Lab supports the functionality of adding burn ins of dynamic lens data when transcoding clips.

A “Dynamic Lens Info” string that contains focal length, aperture and focus distance can be selected from the burn in options to be transcoded to the clips.

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