As for DVD+R DL support, there are two issues worth mentioning.
Layer Break positioning in -dvd-video recordings. This version provides only rudimentary support for physical Layer Break positioning. Essentially the only usage I'm "ready to discuss" at this point is *image* copying of DVD-Video dual-layer media. Idea is to preserve original physical Layer Break in order to ensure smooth playback of the copy. This can be achieved by replacing N in newly introduced -use-the-force-luke=break:N growisofs option with "Legacy lead-out" value from dvd+rw-mediainfo output for *original* media. Without specifying Layer Break position as depicted above the -dvd-video/-compat recording will be "folded" exactly in the middle. No Layer Break positioning is implemented for multi-session recordings.
"BookType" issue. Double Layer media prices make it hard to tolerate incompatibility with legacy DVD-ROM/-Video units/players caused by few bits in lead-in. I therefore would recommend to brand at least -dvd-video/-compat recordings as DVD-ROM whenever possible/applicable. There are units which support "BookType" manipulation functionality, HP and Lite-On to name those who offer DL recorders. Note that *original* Sony DRU-700 firmware apparently supported this, but the functionality was stripped in currently available VY05.
Special thanks to HP, Pav Lucistnik and Sebastian Trueg. A.
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