Pioneer BONUS VIEW BDP-51FD - Manual (Page 61)

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 S-Video output
An output terminal for transmitting separate luminance (Y) and
color (C) signals over a single cord. It offers clearer pictures than the
composite video output.
 Secondary audio
Some BD-ROMs include sub audio streams mixed with the main
audio. These sub audio streams are called “secondary audio”. On
some discs this secondary audio is recorded as the audio for the
secondary video.
 Secondary video
Some BD-ROMs include sub videos superimposed on the main
videos using the Picture-in-Picture function. These sub videos are
called “secondary video”.
 Subtitle language
This refers to the language of the subtitles often used on movies. Up
to 255 languages (255 types of subtitles) can be recorded on BD-
ROM discs, 32 languages (32 types of subtitles) on DVD-Video discs,
so you can select the desired subtitle when watching the disc.
 VC-1
A video codec developed by Microsoft and standardized by the
Society of Motion Picture and Television Engineers (SMPTE). Some
BDs include videos encoded in this codec.