Seamless branching is the provision to make storage jumps on the source medium within a playlist. When a playlist makes these jumps the player must be able to buffer enough data to enable a fluent playback without stuttering or even a pause with loss of media stream connectivity. https://en.wikipedia.org/wiki/Seamless_branching The most common point where DVD's would show problems with seamless branching in the past would be the change of the physical layer (0 => 1). Obviously media players don't need to have a problem there. Seamless branching is used also for other purposes on BD and DVD like interactivity, multiple versions like Directors Cut and Extended Editions next to the original theaterical version on the same disc etc. The current FW 1.3.0 (and all before) has seriously problems with all instances where seamless branching is implemented. It will at least stutter seriously but it may pause loosing image and sound up to several seconds. Want to try it yourself? Use any 1:1 Blu Ray copy with multiple versions, you will see immediately where the extra's/differences start and end. I use normally Avatar with the long versions on it for this pupose, but "The Magnificent Seven 2016 US-release" is also an excellent choice. Here they mixed the standard movie with director comment fragments . This happens here so often that it makes watching the movie as a whole unpleasant. If one does not use the new BD Menu option to play this movie then one gets the wrong playlist with all director comments inserted. The "Age Of Adeline" is also an excellent choice as it even won't sequence scenes correctly without Full Menu support.