Inserting Audio Files from Another Source
On this page you will learn how to add audio files from a free music library and also from a previously-recorded video.
14. While you were on lesson #6 of this tutorial, you made a ScreenFlow video called BlackAndWhite. It had some audio it in. You added both the audio and video to World Gurning Championship.
15. Open up that file now in ScreenFlow .
16. Highlight the audio files from the BlackAndWhite section of World Gurning Championship and delete them.
17. In ScreenFlow click File > New to open up the black menu. Select Record Audio from Built-in Microphone.
18. Record yourself saying this is how I kiss my girlfriend and this is how I suck my nose.
19. Save the ScreenFlow file and then save the audio files into your clipboard (Cmd C). Paste (Cmd V) the two audio files beneath the black and white video clip of the World Gurning Championship file. (See the image above and to the left.)
20. In all likelihood the audio files you just added are either louder or softer than the rest of the audio files. So, you will select ALL of the little audio clips and smooth the volume levels again like you did in point #12 on the previous page. Before you click on the “Add Audio Action” button, check the “Remove Background Noise” box.
Adding Free Music Audio Files
20. It is now time to start adding music to your video. Watch it several times to get an idea of the mood of the various sections. Then open iMovie and go to Window > Music and Sound Effects > iLife Sound Effects.
21. Starting at the top of the iLife Sound Effects panel, listen to a number of different music selections.
22. When you find a piece of music that matches the mood of a particular sequence, drag and drop the music clip to the area below the appropriate video segment.
In order to change the volume of the music, you can select all music clips on the timeline, then use the Volume slider to lower the volume. If you need it to occur only after a specific section of your timeline, you can add an audio action and then change the volume after the action.
23. Now you will learn about an amazing feature of ScreenFlow called “audio ducking”. Ducking occurs when the level of one audio signal is reduced by the presence of another signal. When a person speaks, you want the background music to soften.
With the ScreenFlow ducking feature, the music can be loud, automatically soft when a speaking sound clip is detected and the go loud again after the speaking is finished. If you click on the final project tab and watch the YouTube video again, you can detect a number of examples of audio ducking.
24. In this image, the middle timeline has an audio file that has been dragged in from iMovie. The bottom timeline has two tiny speaking clips highlighted.
♦ Highlight the sound files that are to remain loud.
♦ Click on the audio properties icon.
♦ Check the ducking box.
♦ Move the slider to a quiet enough number such as 25. That represents the volume of the background sound.
♦ Click on the Add Audio Action box.
25. Drag and drop music clips in for virtually the entire video. Apply ducking to the entire video.
26. Publish your video to YouTube.
27. Let your friends know about your amazing YouTube project.
Example of audio ducking on YouTube
Go to laserphoto.ca. When this video first showed up on YouTube, it was much too loud. So, the editor selected ALL of the audio files in ScreenFlow, opened up the audio properties, set the volume to 15% and clicked the Add Audio Action box. Then he selected only the voice clips, checked the ducking box, set the ducking to 25% and clicked the Add Audio Action box.
As far as the settings are concerned, you have to experiment and see what works for your particular video. The author just finished a documentary with the volume set at 48% and the ducking set at 10%. The sound came out perfectly.
He uploaded the new video to YouTube and deleted the old one.
After saving it to YouTube, he inserted the file in a home page of a website and set it to start playing when a visitor opened the home page.