Store preview MP4s in a separate directory
Store preview MP4s in a separate directory

But lie to the CDN, to not break the web frontend.

This probably shouldn't be merged as is. The web frontend should
probably learn of these changes.

xfxf/veyepar,CarlFK/veyepar,CarlFK/veyepar,CarlFK/veyepar,xfxf/veyepar,CarlFK/veyepar,xfxf/veyepar,xfxf/veyepar,CarlFK/veyepar,xfxf/veyepar