Dvd Specifications - LG LHT754 Troubleshooting Manual

DVD Specifications

The DVD specification supports the MPEG video information on a DVD disc in one of the two formats
required for incompatible television systems: the 525/60 NTSC or 625/50 PAL/SECAM video standard.
The program material recorded on a DVD disc can belong to only one of the two video standards,
not both. This restriction applies to only one side of the DVD. If a DVD disc is double-sided, the video
on one side can be recorded in 525/60 NTSC format, and the video on the other side can be 625/50 PAL.
This is because the contents on one side are unrelated to the contents on the opposite side. However,
such a disc is rare in production. In general, there are two types of DVD-Video discs commonly known
as NTSC DVDs and PAL DVDs.
There are three major differences between DVD discs designed for playback on different television
systems:
Picture Dimensions and pixel aspect ratio
1:
(720x480 NTSC, 720x576 PAL),
2: Display frame rate (29.97 frames/sec NTSC, 25 frames/sec PAL),
3: The default audio options (Dolby Digital with NTSC video, MPEG audio with PAL video).
All PAL DVD players can play Dolby Digital audio tracks, but not all NTSC players can
play MPEG audio tracks. Even though PAL video format has a lower display frame rate,
because of its higher picture resolution, the video contents almost always takes more
storage space than what would require for the equivalent the NTSC version.
Home Theatre Troubleshooting - 2007