Audio for idvd projects, P. 974), Adding chapter and – Apple Final Cut Express HD User Manual
Page 974: Compression markers to your sequence
974
Part XII
Audio for iDVD Projects
iDVD projects can have a single audio stream for each menu, slideshow, and movie. All
audio used in iDVD projects ends up as uncompressed AIFF audio on the burned DVD.
When recording and editing audio, use a 48 kilohertz (kHz) sample rate and no
compression. This ensures the best quality.
Important:
When creating DVDs, your audio must have either a 48 kHz or 96 kHz
sample rate. If you use the 44.1 kHz sample rate found on standard audio CDs, iDVD will
convert your audio to the correct sample rate. Additionally, DVDs do not support AAC
or MP3 encoded audio. iDVD will convert any AAC and MP3 audio to DVD-compliant
uncompressed audio.
Adding Chapter and Compression Markers to Your Sequence
Once you have your edited sequence or program finished, you can add markers to the
sequence for use on DVD. Markers are reference points you can place within clips or
sequences that identify specific frames. There are two kinds of markers you can add
that directly relate to authoring a DVD—chapter markers and compression markers.
 Chapter markers allow DVD authoring applications to create a navigable chapter list
for your exported QuickTime movie. Chapter markers force MPEG keyframes (known
as I-frames) at their location, since the DVD specification requires an I-frame at each
chapter point.
 Compression markers identify areas of abrupt change and include two types: those
that are automatically inserted by Final Cut Express HD at all edit points, and those
you manually place in the clip or sequence. Like chapter markers, compression
markers force I-frames at their location, although in this case it is for better quality
encoding, and they are not used to create a chapter list.
Note: When you export a QuickTime movie, you have an option to export various kinds
of markers, including compression, chapter, or DVD Studio Pro markers. When you
choose to export DVD Studio Pro markers, Final Cut Express HD actually exports
chapter markers and all compression markers. This includes compression markers you
set manually, as well as ones created automatically by Final Cut Express HD at edit and
transition points.
For details on adding and deleting markers, see “