...can i use garageband to record audio for my DSLR video shoot?
Like hook up a shotgun mic to my laptop and record the audio?
Yes, this can be done, but you're still going to need extra hardware to do it. Mac computers don't have a mic input. You need an audio interface to connect a mic (something basic like a Tascam US-100 will do). Then you'll need a shotgun microphone (like a Rode NTG2) and an XLR mic cable, boompole, shockmount, etc.
One of the drawbacks to working this way is that you'll need to operate a computer in addition to all of the other things you need to do on set. You'll have to create a project in Garageband, make sure everything is hunky dory between the computer and interface, route and arm the tracks, and command the computer to record and pause with the keyboard and trackpad whenever necessary. Later you'll have to export the tracks from the software. The boom operator won't have very much mobility being tethered to a computer and a hardware interface. If you need to shoot in the field, you'll be reliant on the battery life of your laptop.
Portable digital recorders make it easy to get up and running. The ease of pressing Record and Stop should not be overlooked. Being able to pop out spent batteries and put in fresh ones is a life saver. Quickly being able to dump the recorded files into a computer is one of the greatest things about this technology.
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