Sanyo DUAL CAMERA VPC-PD1TA - Manual (Page 45)

English
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SHOO
TING
CAUTION
During video clip playback, the sound of a motor is audible...
i During recording, the sound of the optical zoom movement or autofocus
movement was recorded. This is not a malfunction.
If no audio is heard...
i The audio is not played back when the video clip is played back in the
frame-by-frame, slow-motion, fast playback or reverse playback mode.