On the contrary, our solution as implemented on our CDN uses a query string parameter numbered 1 - 8 to select one of those sets which are then set by the server in the response. So you can choose it on the fly for any file.
As a VDN (video delivery network) we're focused on 100MB - 8GB video files, so our clients' primary goal is to avoid ever having the file attempt to display in the browser unless as a media URL purposely supplied to an embedded player. In general a raw video file URL would be for a download, and forcing Content Disposition saves having to explain the "Right-click, Save As..." dance regardless of browser.