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How I make screencasts: Lecture capture, part 2

May 31, 2011, 6:25 am

Now that school’s out, I’m going to pick up where I left off (two months ago!) in my series on how I make screencasts. So far I’ve made three posts in this series. In the first post we talked about what a screencast is, exactly, and why anybody would want to make one. In the second post, we saw how the elements of careful planning make screencasting a successful experience. And in the most recent post, we took a look at using Keynote (or PowerPoint) to create a lecture-capture screencast.

Before I talk about the other kinds of screencasts I make, I’m going to take this post to describe how I use my go-to tool for screencasting: Camtasia for Mac, specifically how I use it to make lecture capture videos when I’m not using Keynote. (Full disclosure: I was on the beta-testing team for Camtasia for Mac and got a free license for the software for my efforts. But I can definitely say that I’d gladly have paid the $99 for the software otherwise — it’s that useful.) There is a Windows version of Camtasia and a server-oriented variant called Camtasia Relay, and they are all very similar, so what I describe in this post can be used if lots of different situations.

Let’s suppose I have a lecture or presentation that I want to turn into a screencast, which basically means I need to record the presentation as it happens on the screen and add a voice-over. I’ve already described how to do this with Keynote or PowerPoint, but what if you’re using Prezi, Beamer, or some other presentation tool? What I need is a tool that will record stuff happening on the screen that’s separate from the presentation tool itself. That’s where Camtasia comes in.

Camtasia is software that records video of anything happening on your screen — all of it, or part of it — along with any audio you choose to add, including voiceovers. You can record multiple segments of video, edit those segments, and put it all together with transitions and effects. The interface is laid out a lot like iMovie, so Mac users will feel right at home using it.

There are a lot — seriously, a lot — of options for working with video in Camtasia, too many to get into here. I’ll just show an example of a simple lecture capture putting Prezi and Camtasia together.

First, bring up the screen that has the Prezi in it. (For Prezis particularly, creating the lecture capture works best if you download the Prezi to your local drive and then run it in a window, rather than trying to run it on the web.)

Now launch Camtasia. When you do, a little floating pane will come up that looks like this:

The dropdown menu on the left lets you specify which part of the screen you’re going to capture. I usually just select “YouTube HD/720p”, which records essentially the entire screen. I can crop out what I don’t need later. And once I put it on YouTube (which is my usual destination for screencasts) it’ll be in glorious 720p HD.

Once you’ve selected your area, just click the Record button and start presenting, just as you would if you were giving the lecture in front of a live audience. Your lecture is being recorded behind the scenes and all you see is your screen. Warning: Presenting for a screencast feels a lot different than doing it for a live audience because, well, the audience isn’t there. There’s no body language or ambience to add to the presentation. So this will feel a little unusual at first. Also, I can’t stress enough that you should probably go from a prepared script the first few times you do this, rather than try to wing it. It’ll keep you on track and prevent lots of mistakes.

When you stop recording, you’re brought into the main editing area of Camtasia:

The bottom part of this screen is called the “timeline”. Right now, the one clip that I have in the timeline is a partial video of the presentation. It appears as a chunk of the timeline outlined in blue. Inside the timeline you can see the audio levels given as waveforms, and there’s a playhead along the top of the timeline showing you where you are in the video as well as the time.

At this point, what I usually do is check the sound levels first. A lot of times the built-in microphone on my Macbook doesn’t record very loudly. I’ll listen to a bit of the recorded video to check if that is the case. If so, I go and apply the Dynamics Processor effect to the clip I made:

You apply the clip just by dragging it from the effects area directly onto the clip in the timeline. In fact this is how all the effects, transitions, and other features of Camtasia are applied to video. The Dynamics Processor brings all audio levels up to a uniformly audible setting.

If I have the time, I will watch the whole video from start to finish to see if I’m happy with it. If there’s something I need to edit out — I goofed the script, or sneezed, or the phone rang, etc. — I can go back and edit that part out just by putting the playhead just before the mistake:

Then selecting “Split selected at playhead” from the Edit menu; this splits the video clip in two, right where the blooper is. Then move the playhead until just after the mistake, and selecting “Trim Start to Playhead”. This will crop out the blooper from the second clip. Then you can just drag the second clip over next to the first one, and with that, the blooper is edited out.

The ability to edit in such an easy way really changed screencasting for me. You will make mistakes when you screencast, no matter how good or experienced you get. But you don’t want to have to throw away an entire screencast because of one goof. If I am screencasting and I make a mistake, I just pause for a moment, and then I start again from the point of error. The pause will show up on the audio as a flat spot, and I can go back and edit the error out. You cannot do this with the voiceover features of Keynote and PowerPoint, and it makes a huge difference.

If this is just a straight lecture capture — so there’s no other video coming in from a different source — at this point I’m done. The only thing left to do is add the “credits page” that I always put at the end of my screencasts that lists my email, YouTube channel, Twitter, and so on. I have this saved as a PDF. To bring it into the timeline, I go to Import Media:

and select it from the file finder. It then appears as a clip:

I just drag it into the timeline at the end of the video:

And then, for effect, add a fade-in transition from the video to the credits, which I do by finding it in the transitions menu:

And dragging and dropping it in the little seam between the video clip and the credits page:

Now I’m ready to publish. Camtasia allows me to publish the resulting video directly to my YouTube channel using the Share menu:

As you can see, there are options for iTunes and Screencast.com as well. Or you can just choose “Export…” which exports the video to a file format of your choice, for uploading wherever you want.

After I start the process, Camtasia converts the video to Quicktime and then uploads it with the title I gave it. A 10-minute video will take several minutes to complete this process on a Macbook Pro. Your mileage will vary according to your system hardware and your internet connection. After it’s done uploading, I still have to go to YouTube and add metadata. But otherwise that’s it!

What’s nice about Camtasia is that the tool is separate from the presentation tool you’re using. So if you already have the presentation content made up, you can turn it into a screencast quite easily. It doesn’t matter whether it’s Prezi, Beamer, a text document you’re scrolling down, or anything else. And the more you do this, the easier it gets to convert existing presentation content into a mobile device-friendly screencast.

In the next post, I’ll talk about what I call “whiteboard” screencasts, where I record stuff that I am writing on the screen. This is a lot like what Salman Khan at Khan Academy does. Hopefully it won’t be another two months before I get to that.

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