Sony HDR-SR1 - Manual (Page 135)

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x Recording image quality
The image quality, HD (high definition) or SD
(standard definition), can be selected for movies.
The higher the recording quality, the shorter the
recording time of the hard disk.
x Thumbnail
Reduced-size images which enable you to view
many images at the same time. “VISUAL
INDEX” use a thumbnail display system.
x VBR
VBR stands for Variable Bit Rate, the recording
format for automatically controlling the bit rate
(the volume of recording data in a given time
segment) according to the scene being recorded.
For fast-moving video, a lot of hard disk space is
used to produce a clear image, so the recording
time to the hard disk shortens.
x VISUAL INDEX
This function displays images of movies and still
images you have recorded so that you can select
those scenes you want to play back.