User Guide

Preparing Video Assets 43
Preparing Assets for Multi-Angle Play
When preparing video assets that will be used for multi-angle play, the following
requirements must be observed:
• Each video angle must have the same duration.
• Each video angle must contain the same GOP structure (same number of fields, frames,
and pattern of I, B and P-frames).
• Each video angle must contain the same number of GOPs.
• Each video angle must be encoded at the same bit rate.
• Each video angle must be encoded with the same type of bit rate (constant or variable).
• Each video angle must be encoded with closed GOPs.
• If video has been encoded at a constant bit rate, each video angle must have the same
vbv_delay initial value.
• The combined bit rate of video, audio, and subpicture data must not exceed 8.0 Mbps
per angle stream. This bit-rate ceiling can decrease by as much as 1.2 Mbps as the
number of video angles increases.
Preparing Assets for Seamless Play
When preparing video assets that play seamlessly, the following requirements must be
observed:
• Each video asset must be encoded at the same bit rate.
• Each video asset must be encoded with the same type of bit rate (constant or variable).
Note: The physical order of video tracks on the disc must be identical to their playback
order. To change the physical placement of video tracks on the disc, see “Dual-Layer Discs”
on page 245.