Hello, 2012/9/30 pls <p.l.schm...@gmx.de> > Sibelius 7.0.0 exports wrong duration values for chorded notes in tuplets. > The exported value in this example ( > https://www.dropbox.com/s/vrvdabwym9tezd0/time-modification_and_chorded_notes.xml) > is 256 instead of 170 for a quarter note in a triplet of eighths > (<divisions>256</divisions>). <durations>170</durations> is not an optimal > value for a quarter note in a triplet of eighths as there is a rounding > difference (256*2/3=170.6666...). The same holds for an eighth note in a > triplet of eighths (128*2/3=85.3333... instead of 86 used here). > musicxml2ly does not like rounding errors. The resulting LilyPond-code > contains wild scaling durations and a superfluous spacer rest: > \times 2/3 { <c'' a'>4*255/256 s512*43 r8*129/128 } r4 r2 } > > This is bad because we have a bar check problem here! > > Sometimes music applications export suboptimal/false values for divisions > and durations. > A solution: musicxml2ly should recalculate all durations on the basis of a > divisions value of 6720. This figure is divisible without remainder by > e.g. 2, 3, 4, 5, 6, 7, 8, 16, 32, 64 and therefore can provide for note > durations up to 256th. A quarter note (6720) in a triplet of eighths would > have a value of 4480 (6720*2/3). An eighth note (6720/2=3360) in a triplet > of eighths would have a value of 2240 (3360*2/3). (half note: 6720*2 = > 13440.) >
Thank you for the report. This has been added as http://code.google.com/p/lilypond/issues/detail?id=2878 Marek bug squad member _______________________________________________ bug-lilypond mailing list bug-lilypond@gnu.org https://lists.gnu.org/mailman/listinfo/bug-lilypond
