Select the sound clip you want to trim by clicking its name at the top of its waveform the clip becomes outlined in yellow. Names appear in the top-left corner of each green or purple waveform to make it easy to identify them. Purple waveforms represent voiceovers or audio that was detached from a video clip. Green waveforms represent sounds and music you’ve added to your project. Blue waveforms represent the sound that was recorded with your video. Waveforms for each of the sound elements in your project appear in green, blue, or purple bands below the video clips. With your project open, click the Audio Waveform button below the Project browser. These instructions don’t apply to modifying the audio recorded with, and still attached to, your video, or to modifying background music you’ve added. These instructions apply to modifying the startpoints and endpoints of audio you’ve added to your project, or audio you’ve detached from video. This feature is especially useful if you have many changes to make to your project’s audio. With audio waveforms visible in the Project browser, you can modify aspects of all the sound elements in your project in the same window. You can pin the beginning of a background music clip to a specific video clip, so that if you move the clip, the music moves with it: Pin the start of a background music clip to a video frame. When you trim a background music clip, iMovie applies a one-second fade-out to the end of the music clip so that the music doesn’t end abruptly. To preview your work, click the Play button in the Clip Trimmer click the button again to stop the preview.Ĭlick Done when you’re satisfied with the result. This makes it easy for you to adjust the sound clip to the exact length of the video clip or project it applies to. To set where the sound clip stops playing, drag the yellow handle at the end of the clip.ĭepending on which type of clip you’re trimming, the duration of the sound clip (the time stamp) appears next to the handle. Yellow handles appear on both sides of the clip, as shown below. To set where the clip starts playing, drag the yellow handle near the start of the clip. Any dark blue or green portion of the waveform represents the part of the song or audio clip not currently used in the project. The light blue or green portion of the waveform represents the part of the song or audio clip that’s used in the project. The Clip Trimmer opens, showing a magnified waveform view of the sound or music. The Action menu icon appears at the left end of the green or purple sound clip bar, or in the upper-left corner of the background music well in your project. In the Project browser, move your pointer over the audio clip you want to trim, and then choose Clip Trimmer from the Action pop-up menu (looks like a gear) that appears. The Clip Trimmer also gives you access to the unused portions of the clip you’re editing, which can help you fine-tune your trimming. I created a custom title slide image for it because YouTube likes those to be 1280x720px - I used Pixelmator for that.The Clip Trimmer lets you trim the sound elements in your project one at a time, so it’s especially useful if there’s just one sound element you want to change (the background music or a sound effect, for example). Despite the 1.03GB estimate the video ended up being 259.8MB - presumably because it was mostly static images. I exported the result using the File -> Share -> File. This was faster than I expected - I quickly got a feel for if I should jump the duration up to 8s or 10s and then tweaked those numbers by hitting the play and pause buttons. I did this by selecting each image in turn, clicking the little (i) icon and manually editing the duration in seconds. Instead, I decided to manually alter the duration of each one. I wanted each slide to be on screen for the correct duration to match the audio.Īt first I tried dragging and dropping the edges of the images, but this was way too fiddly. Select all of the images, click the "Crop" icon, then set the Style to "Fill". To get rid of this you need to use the "Crop" tool (unintuitively). When you import images into iMovie it applies the Ken Burns zoom effect to them by default, which wasn't what I wanted. I dragged and dropped in my MP3 recording too.
I then imported the images into iMovie by dragging and dropping the whole pile of them from the finder. The slides were in Keynote, so I started by exporting them to individual images: File -> Export To -> Images. I found an MP3 recording of an old talk I gave and decided to use the slides from that talk to create a video using iMovie. Simon Willison’s TILs Syncing slide images and audio in iMovie Syncing slide images and audio in iMovie | Simon Willison’s TILs
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