Google made a small replace to the video structured information assist paperwork to speak that the thumbnailUrl now additionally helps WebP and SVG picture codecs, along with the already documented BMP, GIF, JPEG, and PNG picture codecs.
Google wrote that on April 7, 2021 it “up to date the Video structured information documentation to state that the thumbnailUrl property should use one of many supported Google Pictures file codecs. Beforehand, the documentation did not embrace WebP and SVG.”
Now you can see for the thumbnail-url section of the video structured information web page hyperlinks to the thumbnail image guidelines, that now specifies the supported thumbnail codecs are from the Google Images supported formats. Sure, that’s plenty of hyperlinks. However that doc says “Google Pictures helps pictures within the following codecs: BMP, GIF, JPEG, PNG, WebP, and SVG.”
That is what pattern code seems like for the thumbnailUrl and take into account, the .jpg can now be webp or svg:
Discussion board dialogue at Twitter.