Ceci est une ancienne révision du document !
We’ve all heard voiceovers on the radio where the music quickly lowers in volume to let the announcer speak over the quietly playing audio in the background. That’s what we’ll look at this month.
Audio/Video Obviously, we’ll use a video, playing audio, as our base to work from. I’ve dragged in a video file to Video 1. Now I add a voiceover file to the project. Now, with the video audio playing, and the voiceover (shown below), it’ll be a mass of noise. We want to right-click on the video and choose Add Effect > Audio correction > Volume (keyframable). Keyframable is something you may remember from previous FCM Kdenlive articles. It means that we’ll be able to set points to control the level of volume.
Select the video clip in Video 1 (which will give it a red border), and you’ll see the ‘Volume (keyframable)’ (what I’ll call Vk from now on) options in the Properties tab. What we want to do is click (in the timeline) where, in the video, we want the volume to begin fading down, then click the large plus (‘+’) icon in the Vk properties. You’ll see a red triangle mark that keyframe. Note that the black triangle in the Vk properties is in the same place as the time slider is in the timeline.
So that’s where we want it to start lowering. Do the same again where you’d want it to be at its lowest. This time slide the Gain value down to where you want the volume for the voice over. I’ve set the Gain value (cropped off in the screen) to -22dB. You’ll notice the white line in the video track has lowered – to show, visually, the volume level. All that’s left is to do the opposite on the other side. A keyframe at the low value (-22dB in my case), and a final one at the 100% (0dB) value. You can, of course, do a similar thing with your voiceover file to have it fade in as the music fades out. Also, I’ve made my fade outs two seconds long, just to show you how it looks. Your fadeout may be a second. Maybe even less.