https://forums.adobe.com/people/John+T+Smith wrote
Simply to have more burn control (ie-ability to select a slower burn speed) I make it a habit to ALWAYS tell Encore3 to create an ISO, and then use Imgburn to create the actual DVD
(with apologies for the selective quote)
The best burn speed is the slowest combination allowed by media & burner and IMGBurn simply does this better than any other tool I have tried - if you set the speed too low, for example, it will automatically adjust to the best that can be achieved.
We have 2 Blu-ray burners & 3 DVD and they all have different speeds - even with the same media (for BD50 we always use the Japanese Verbatim BDR 360) on my main DAW the best I can get is 4x (the only available speed) but on this system (authoring) I can get down to 2x - there is nothing to be gained at all by burning too fast and this should be avoided at all costs.
Swapping book types is exactly how Jon describes above - setting this is a way to try & get around some set top players not handling DVD+R well and setting book type to DVD ROM will sometimes get around this. Thankfully the whole +/- R thing seems to be largely consigned to the dustbin of history these days although it must be said that burned BD-R are at about the same place CD was 15 years ago - flaky. Far, far too many machines will simply not load these at all - PS4, PS3, X-Box, X-Box 1 etc all spit the dummy when presented with burned BD discs - even though at the time Sony were selling Vegas as a way to put your music onto Blu-ray yet the discs will not load into their PlayStation consoles which are sold as Blu-ray players (when they are not any such thing and should be treated with the same suspicion as software players, which is what they really are) due to concerns about so-called "piracy".
Finally the other thing that seems to slip through sometimes is that older players have a much slower access speed. My older Oppo BDP-83 SE runs at a value of 13 against my BDP-105 in the upper 20's (for some reason I want to type "FPS" but this might not be right (My Java programmer puts a counter on test builds & I cannot remember what the actual acronym is) and I don't want to confuse people by letting them think this is frames per second as it isn't the same thing as a frame rate for the video file. The point is older players are far slower, and the slower the player the longer it takes to load all the graphics etc. So for test purposes it is best to have a range of players to check on - we have the 2 Oppo, and a really dodgy Panasonic DMR-PWT655 unit that also carries it's own internal HDD as well as freeview and a way to record TV programmes etc - in it's manual it starts to mention playing actual discs way back on page 37!! The point is that it is a dog of a player with a badly flawed Java implementation which is why we use it ever since we were alerted to it's problems. We also test on PowerDVD Ultra since version 15 but none of the PlayStations will load the discs until we get to test pressings.
But I ramble on and it is time I shut up