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To reset the camera 1) Close the LCD monitor to turn off the camera and remove the power supply (battery pack or AC adapter) from the camera, then reattach it. 2) Select [FACTORY PRESET] from the MENU.
Is there an external speaker? Download the video to a computer and see if you get audio by playing the video in Windows Media Player or VLC Player. If still no audio, it may be the camera is malfuctioning.
First off which camera is it? If the video is playing real choppy the best video player that I have found for both PC and Mac is VLC Media Player. It is a free download from videolan.org and that is the player that I recommend for use with all Casio cameras.
We had the same issue - audio but no video on playback on a Win XP pc on both Windows Media Player and Media Player Classic. At some stage it suddenly stopped working - I suspect a Windows update? I've found video plays back correctly with the VLC player: http://www.videolan.org/vlc/ I've raised a support call with HP regarding this issue.
Odds are it is the media player.
Most often with digital video, frames will drop but the software will make sure the audio isn't lost. There is a lot mmore data transfer with video than audio. The dropped frames will result in a "jerky" video playback. We humans can compensate for lost frames - in fact a lot of video on the web used to play at maximum 15 frames per second. But we don't like it when the sound is lost. What would it sound like if we only heard half the audio? We would shut it down fast.
The computer has to deal with software talking to hardware. The hardware has to re-draw every frame for you on your monitor, but it has to wait for the data to be sent and the software has to deal with that. And this will be more evident the older your computer is.
Hope this helps.