miniDV tape based, standard definition video, camcorder's "DV port" is a IEEE1394-compliant, 4-pin, firewire port. DV, IEEE1394, firewire and i.LINK are all the same thing. Page 180 of the camcorder's Operating Guide shows the location of the DV/i.LINK port... on the right side of the camcorder body under the cover.
USB is used ONLY for getting photos off the Memory Stick flash memory storage (when the camcorder is in "Memory" mode - refer to the camcorder's Power/Mode selection knob). According to the manual, the DCR-TRV30 has a USB port - refer to page 180, item 31 - but you are right, the USB port will not allow any video from the tape to get to the computer.
Download the camcorder's Operating Manual from Sony's Support area if you do not have it.
Your Apple Macintosh PowerBook (running on a G4 PowerPC chip) - if it is like mine - has a 9-pin firewire (800) port on the right side in the middle of all the ports.
You need a 4-pin to 9-pin firewire cable. The last one I got at Fry's Electronics was a Belkin 1 meter cable for about $15. If your computer has a 6-pin firewire port, then a 4-pin to 6-pin cable is required.
With the camcorder OFF, connect the firewire cable to the camcorder and computer.
If the computer was off, turn it on.
When a stable desktop is on the monitor, turn on the camcorder and put it in "VCR" mode.
Launch iMovie, name the video project, set the destination for the video files and project file and Import or "Capture" the video (it depends on the version of iMovie you are using).
Note: This would be the same for Windows users if your computer has a 4-pin or 6-pin firewire cable - substitute "MovieMaker" for iMovie and use an appropriate 4-pin to 4-pin or 4-pin to 6-pin firewire cable.
Alert: The laptops of the day did not have large internal hard disc drives like we are used to now - importing 60 minutes of standard definition video will consume about 14 gig of computer hard disc space. An external hard disc drive (even connected using USB) is STRONGLY recommended for use to save the video project files. Saving the video project files to the internal drive can cause slow downs because of system resources. This is the same alert for any operating system.
The Sony DCR-TRV30 does not record to "mini discs". If your camcorder records to "miniDVDs" - the 8cm discs - you must NOT put the mini discs in the computer's slot loading SuperDrive. If you do, you risk breaking the SuperDrive and will have challenges removing the disc from the slot load mechanism. You have a choice:
1) Get an external drawer loading DVD drive. I like the ones from LaCie. If you go this route, download and install HandBrake from www.handbrake.fr
After finalizing the disc in the camcorder, you will take that disc out, put it in the drawer-loading DVD drive and "rip" the video using HandBrake (there are other rippers out there, but the finalizing and ripping steps are the same) and save the file to a standard definition, high quality MOV video file that iMove can deal with.
2) Get an analog-digital converter. Connect the camcorder's AV ports to the A/D converter; connect the converter's firewire port to the computer's firewire port. I like the Canopus (Grass Valley) ADVC55 or ADVC110 units. Import the video to iMovie... press Play on the camcorder...
So... once we know which camcorder you are using, we may be able to help further - but this pretty much covers what you need regardless of the storage media your camcorder uses.
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