Unfortunately Zidoo players still don't support Seamless Branching only Menu Processing on DVD, BD and UHD/4K discs (folders and ISO's). Seamless Branching is essential for any discs with a more complex content. Today there is also still a problem with Menu Processing on some UHD-BD's of a specific source. By my knowledge all current media players have troubles with those (PowerDVD17, Egreat, Zidoo tested by me). Examples where these features are needed tells the story. A disc may contain multiple episodes or different cuts of the same movie. These are then put on different tracks on the disc. Without Menu processing to select the right track it is impossible to play these disc as mostly desired. This is the easiest variant as each video is still on an individual Track using a single Stream. Also discs with video clips and Audio only BD's will use a track per song. On a DVD it is not directly possible to see how many Streams and Playlists are being used but on BD, 3D-BD and UHD-BD this is easy to see by just looking into the respective folders. On most discs the main movie is a single Track using a single Stream (this is a very big file forming most of the total content). Players without Menu capabilities or when bypassing menu Processing (on players that offer that choice too) the media player will typically select the playlist with the longest duration. Most of the time the longest playlist is indeed what is desired and will play the desired Video completely. There are exceptions to this though and the likelihood is increasing especially with UHD-BD's now. The reason for using it more often on UHD is simple as the film-industry looks for simplification of their logistics and as such scrapped the 3 regions and different discs for standard versions ans special cuts. They now put all versions on a single disc with many audio languages and even more subtitle languages. - There may be a supplement/extra on the disc which in fact is longer in duration that the actual movie. One will then get e..g. "The making of that movie" instead of the actual movie. - Another problem is when there are special versions of the movie on the disc. A good example is "The Magnificent Seven 2016" which has a standard version and a special version with directors+actors comment inserted into the original movie. Obviously this version with comments is by far the longest one and will be played. Some players without menu processing have an option to select playlists by length. Despite being not very sophisticated this works remarkable well in most cases described (Xtreamer eXpress is a good example). Next to this movies may have multiple versions/cuts of the same movie on the disc using individual streams for any deleted/added/changed scenes on the various cuts. Menu selection options will enable the viewer to select the desired version like: Theatrical Cut, Extended Edition, International Version or Directors Cut. This technique was rarely used on DVD, occasionally on BD, I think never on 3D-BD but regularly now on UHD-BD. The movie-industry seems to have stopped making many versions of UHD discs and typically combine all available cuts on a single disc now (also region codes where dropped). The actual playback runs via a matching Playlist which pieces all corresponding streams of the played cut together. Obviously the media player must now being capable to jump multiple streams on the disc without causing any interruption of the playback. This capability is called Seamless Branching and as mentioned before already exists since the introduction of DVD. Zidoo players still will show a very visible glitch when jumping streams and even interrupt audio during such a jump the other players mentioned do this correctly. Seamless branching is used: For movies that have more than version (extended, director's cut, etc.), because some scenes will exist in several versions For movies which title is different depending on countries, and is displayed at the beginning or at the end For cartoons that contain translatable text in some scenes (those parts will exist in several versions) As a result it happens a lot more for cartoons than for movies, as Pixar for example translates the text in images almost systematically. The story does not end here as lately we see also discs with "playlist obfuscation" on it. Also here the cut is crafted using multiple streams but not to support multiple cuts but just to jeopardize playback on media players. Typically they create multiple (can be very many) playlists with the same length using all streams but all except one being in the wrong order/sequence. So when playing these discs without proper menu processing there is a very high chance that one gets the wrong sequence on some places when watching which is extremely irritating. Also one needs to find out which is the correct playlist to re-mux such a movie into an movie-only copy. "The Age of Adeline" is a good example of a disc with playlist obfuscation on it. Again here both Menu Processing plus Seamless Branching are essential features for correct and fluent playback. Warning: It is very easy to confuse general player/network hick ups with seamless branching problems. Take a movie which you know very well which added just a few extra scenes like Avatar Extended Edition to see for yourself.