Sony DCR-TRV39 - Manual (Page 139)

4-11 Movie Editing Preferences
Click the [Preferences] button.
Still Picture Capture Setting
When still pictures are arranged on the storyboard, they are automatically enlarged or reduced according
to the size of the movie clips used. Checking 'Lock aspect ratio' prevents changes to the proportions of
still pictures added to movies you create yourself.
Soundtrack Grid Setting
Checking 'Snap to stream grid' will allow sound media to be easily placed in the soundtrack according to
other items placed in the media stream.
MPEG1 Quality Settings
This section allows you to select the image quality of MPEG1 movies you create yourself. The higher
the quality setting, the more disk space required.
Work Disk Setting (Macintosh only)
Defines the disk to be used as virtual memory for temporary files.