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Extracting Audio from Video > Extracting Audio from Video - Pg. 239

Extracting Audio from Video iMovie is perfectly capable of stripping the audio portion of your footage apart from the video. All you have to do is click the video clip in question and then choose AdvancedExtract Audio. As shown in Figure 8-14, the recorded audio suddenly shows up in your frst audio track as an independent audio clip; its pushpins indicate that it's been locked to the original video. Figure 8-14: Top: Highlight a camcorder clip and choose AdvancedExtract Audio. Middle: The camcorder audio appears as an independent clip, which you can manipulate exactly as though it's any ordinary audio clip. Bottom: You can create a reverb or echo effect by overlaying the same extracted audio several times. (The "soundwave" images have been turned off here for clarity.) Extracting Audio from Video This command unleashes all kinds of useful new tricks that are impossible to achieve any other way: ·Makeanecho. This is a cool one. Copy the extracted clip and paste it right back into the audio track--and then position it a few frames to the right of the original, as shown at bottom in Figure 8-14. Use the slider at the bottom of the Timeline Viewer to make it slightly quieter than the original. Repeat a couple more times, until you've got a realistic echo or reverb sound. ·Boosttheaudio.The Volume slider at the bottom of the Timeline Viewer is a ter- rifc help in boosting feeble camcorder audio. It does, however, have its limit: it can't crank the volume more than 50 percent above the original level. Sometimes, even that's not enough to rescue a line of mumbled dialog, or the distant utterances of eighth-graders on the school stage 100 yards away. When all else fails, try this crazy technique: Copy the extracted clip and paste it right back on top of itself. iMovie now plays both audio tracks simultaneously, giv- ing an enormous boost to the volume. In fact, you can stack two, three, four, or even more copies of the same clip on top of each other, all in the same spot, for even more volume boosting. chapter8:narration,music,andsound 239