Roxio DVDit Pro HD, User Manual

Page: 64 / 222

Chapter 4 Importing assets
64
Compliant video and audio requirements
When burning a disc, or writing a volume, disc image, or DLT, DVDit Pro HD transcodes
video and audio files to DVD- or Blu-ray-compliant formats if necessary. This section can
help you to create compliant files in third-party applications. DVDit Pro HD does not re-
encode compliant files (unless you force it to), which saves time when burning discs.
DVD-Video is based on the MPEG compression standards. The MPEG standards permit a
wide range of image sizes, aspect ratios, bit rates, and video frame rates. DVD-Video uses a
strictly limited subset of the MPEG standards, permitting only some image resolutions,
frame rates, aspect ratios, and certain other parameters. The following sections describe the
required settings:
Blu-ray output in DVDit Pro HD is also based on the MPEG compression standards. DVDit
Pro HD supports standard definition (720 x 480 and 720 x 576) and high definition
(1280 x 720, 1440 x 1080 and 1920 x 1080) MPEG-2 assets. You can create Blu-ray discs
that contain disparate pieces of video with any combination of legal resolutions and frame
rates.
The following sections describe the required settings:
• “DVD-compliant video” on page 65
• “DVD-compliant audio” on page 66
To fit a specific length of video onto a disc, see “Choosing bit rates for video and audio” on
page 67 .
Other settings depend on the kind of video that you are encoding. Check your encoder’s
documentation for advice. The effect of some settings (such as
field order ) may not be
noticeable until you view the finished disc on a TV.
DVDit_Pro_HD.book Page 64 Monday, September 25, 2006 2:32 PM