I work for JVC and would like to try to help.
This generation of JVC camcorders was designed to work best with Apple using Firewire (iLink), not USB. In order to do this, the camcorder must be set to a special recording mode called 1440CBR. He is some additional detail:
Preparation:
• All video must be recorded in the 1440CBR mode.
• When you are done recording, create a playlist with the recorded video you would like to edit
• Select the 1440CBR output on your HD Everio
• Start your iMovie ’08/'09 software
• You need a 4 pin to 6 pin i.Link cable—Don’t use USB
• It is not necessary to install any additional software or plug ins to edit with iMovie ’08/'09 via i.Link
Connect:
• Connect the 6 pin connector on the i.Link cable to the Apple computer & connect the 4 pin connector on the i.Link cable to the JVC HD Everio
• The iMovie ’08/'09 import window automatically opens
Import:
• Choose “Dubbing Playback”
• Push the function button, choose “Playback Playlist” and move the cursor to the desired playlist
• Do not push in on the joystick to select it
• Instead, right click to enter “Dubbing Playback”
• Click through the on screen reminders until you get to “PREPARE THE RECORDING DEVICE”
• Click “Import” on iMovie ’08/'09
• When finished, the import stops automatically
Edit:
• At this point the video has been imported and can be edited with iMovie ’08/'09
File Attributes:
• Right click on the file to check the attributes
• 1440CBR data is saved as a 1920 x 1080 .mov file
Note #1: This suggested method is specific to the GZ-HD3. The GZ-HD5, GZ-HD6 and GZ-HD7 all work in a very similar manner, as do the GZ-HD30 & GZ-HD40 when they are set to record in the MPEG2 (.tod) mode. Please refer to the original owner's manual for specifics on how to engage the dubbing playback mode with each model, as there are some minor variances. More recent 2009 model JVC camcorders, such as the GZ-HM200, GZ-HD300, GZ-HD320 & GZ-HM400 all use a different recording format (AVCHD/.mts) which is much easier to use. With any recent Apple computer and iMovie ‘08/’09 those 2009 camcorders are basically plug and play. Simply connect your USB cable and you can import any video.
Note #2: For this to work, all video must be recorded in the 1440CBR mode. This is the key. Think of the 1440CBR mode as the Apple/i.Link mode! It is mandatory on this generation of JVC camcorder when used with Apple. If you did not use this mode, then your only choice is to try the other suggestions in this thread. Also, if you did not use 1440CBR and wish to connect via USB, make sure to install the JVC Quick Time Plug-in which comes on CD-ROM with the camcorder, as well as the Quick Time Plug In update which is available at this website:
http://www2.cli.co.jp/products/ne/updateqtc_for_gzhd7/qtc3eupdate.htm
I hope this is helpful.