Unlocking iMovie '09 & '11
I don't have an AppleTV. I have a DVD player. My in-laws don't have an AppleTV. They, too, have a DVD player. Steve Jobs has an AppleTV. This post is not for him. Here's how you send a movie to iDVD.
First things first
"Send to iDVD" is gone. It left no forwarding address. Last I heard, it ran off with GarageBand. Before it left, however, it trained the Media Browser to take its place. Before you can send a movie to iDVD, you need to send it to the Media Browser. I have already covered the "MB", so head on over there if you haven't yet read that post.
How to send movies to the Media Browser
NOTE: If you want to add chapter markers to your movie before you send it to iDVD, you will need to send your movie through GarageBand instead. That, too, has already been covered.
How to add chapter markers
Send your movie to the Media Browser and make sure to select the highest quality setting available.
Media Browser: Check. Now what?
Now that you have your movie in the media browser, feel free to quit iMovie. You are done with it. Launch iDVD and create the new DVD project or open the one you already made for burning this particular movie.
Within iDVD, there is a new and (slightly) improved Media Browser for getting at your iLife. Get there by clicking the "Media" button in the bottom right corner of your window.
Select the "Movies" button on the top right and open the project you created under the "iMovie" menu option. You will see all the different sizes that you sent to the media browser, ready and waiting.
At this point comes the easiest part of the whole process. Drag the largest size you sent to the media browser and drop it into your iDVD project. That's it. No, really. That's it. Don't believe me? Go to the Project menu and select "Project Info..."
You will probably still see your movie being encoded for DVD. Depending on the size you dropped into the iDVD window, it will probably be called "large.m4v".
Make any of the other changes to your DVD menus and so on. Then burn, baby, burn!
I'm concerned about quality
The quality of this process concerns me, too. What is happening here is your movie is being encoded once by iMovie to get it into the Media Browser and then again by iDVD to get it in the proper format for a DVD. Each step involves a "lossy" encoding, so a little data is lost at each step along the way. However, as long as the video you dragged from the Media Browser into iDVD was better than 480p quality, you'll probably be okay. You can check this by looking under "Dimensions" in the Media Browser and looking at the number after the "x".
I will have to look into the quality issues another day, but if you notice any differences in quality or notice that there are none, please take a moment to tell us about it in the comments.
Everyone burn an extra copy and send it to Steve. Something tells me he still has a DVD player.