Hi Michael
     Not 100% but it is unlikely to be an image processing, having delivered directly to playout servers there are a load of things clocks and title headers that all delivery needs for on-demand they won't need clocks but there will be other stuff tacked on the front of the file, also there is versioning and captions, which really demand a track based timeline so you can turn tracks on and of and nest and the need to lay into a timeline with the right leader, in other words the magnetic timeline in FCPX makes all this very difficult to do easily, it is much more likely to things to with this stuff than anything to do with image processing or image quality, to be honest, if anything the image processing in FCPX is better than Avid or Premier, but the mkagnetic timeline makes a very bad fit with the mechanics of delivering a file to a playout server compared to track based bit of edit software even for an on-demand service, as I say not 100% but having delivered adds directly to broadcast playout servers I have first-hand experience of what a ball ache it is, and I suspect both Netflx and Amazone will be using adapted play out servers or software of somkind, also I think Netflix adds its own closed captions and alternative dialogue tracks but not surte about altered versions for different markets, but agian this may use XML from the edit and again all the software on the list is track based FCPX is the only one that is not

Hope that helps

James Marsden
DIT London