After installing this module and creating some JWPlayer remote media, Drupal's cron fails with this error:
Error: Typed property Drupal\jw_video_media_source\MediaFetcher::$thumbnailWidth must not be accessed before initialization in Drupal\jw_video_media_source\MediaFetcher->getThumbnailWidth() (line 447 of /code/modules/contrib/jw_video_media_source/src/MediaFetcher.php)
Ensure that values are assigned for $thumbnailWidth and $thumbnailHeight in the MediaFetcher.
Needs review
1.0
Code
Here's a patch which selects the first thumbnail returned by the API, and uses the width specified. Its height is not specified by the API, so this is calculated on the assumption that the video and thumbnail are using 16:9 aspect ratio.