Extracting length from Commons videos

This query is marked as a draft This query has been published by Isaac (WMF).

There are two types of img_metadata data formats: JSONs and PHP-serialized strings. This approach handles both.
The metadata keys/values depend on the media type (ogg, mpeg, or webm). This approach handles all three.

Data details: https://www.mediawiki.org/wiki/Manual:Image_table

SQL

SELECT
  img_minor_mime,
  IF(img_minor_mime = 'ogg',
        ROUND(COALESCE(JSON_EXTRACT(img_metadata, '$.data.length'), SUBSTR(REGEXP_SUBSTR(img_metadata, '(s:6:"length";d:)[0-9]*\.?[0-9]*'), 16), 0), 3),
        ROUND(COALESCE(JSON_EXTRACT(img_metadata, '$.data.playtime_seconds'), SUBSTR(REGEXP_SUBSTR(img_metadata, '(s:16:"playtime_seconds";d:)[0-9]*\.?[0-9]*'), 27), 0), 3)
       ) AS video_length,
  img_name,
  img_metadata
 FROM image
 WHERE img_media_type = 'VIDEO'
 LIMIT 200

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