The video schema currently allows additional properties on video data, but these attributes are not used by the website (and cannot be used without first being validated by the schema). The schema should disallow this, which will require first removing unneeded data from video files or moving data into a more correct field (e.g. see https://github.com/pyvideo/data/tree/main/writethedocs-au-2018 for an example of data that is present in an "abstract" field but should be in the "description" field instead).