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Hey, I'd like to talk a little bit about working with audio in the VSE. There's three kinds of audio. There's the audio that comes in and that's interleaved automatically in an MOV file. As you can see here we have the video strip of Megan and then we have the audio strip as well. The audio strip has the same input location. It tells us where it's coming from and we can automatically apply a standard or fixed amount of Gain and a fixed amount of Pan. Pan negative, to all the way to -1 is far left, and then positive 1 is far right, so that shifts the stereo balance of the audio source.
The other way we can do is we can animate the Gain by using the Factor Curve, so the Animation Curve, as you know with all other effects does different things, but here just by pointing and clicking we've basically muted out the first 20% of the audio strip and then it comes up. So now, let's see. That's probability too much. I'm going to go ahead and right select that IPO Curve Point, press X to delete it, and now I have a nice little curve where it comes in with a little bit of pow.
Then it kind of fades out a little bit. So it fades in, grabs their attention, and away they go. (Megan: Welcome to Garden Spot. I'm Megan Anderson, your host with the green thumb.) (Megan: On today's show, I've got our gardening tip of the week.) The other kind of audio is I can just bring in an audio track from the hard drive in a WAV format, either 8 or 16 bit audio. To do that, all I need to do is click Audio (HD), and that can be any kind of music background, or music track, let's say.
I can also bring in an audio from a RAM file, which is a WAV file that is loaded into Random Access Memory. The neat thing about Random Access Memory loaded WAV files is that I can see the WAV form. So I can see exactly when she starts to talk and also get an idea for the amplitude, and sometimes when you get really good at this, you can even kind of recognize what she's saying based on the WAV forms. This is especially great for cutting and everything, when you're looking for blank spots to cut out and looking for places to splice in.
Now, when you're working with audio and you want to integrate the audio and interleave the audio in your final output, on the Output side, you need to use the FFmpeg Library to encode the audio in with the video. That's done by coming over here to the Format panel and selecting FFmpeg. So now when you do that, two other panels come up. One is the Video and then the other is the Audio. On the Audio then what we need to do is enable Multiplex Audio over here to interleave whatever the audio track is coming from the VSE on out.
Then select the codec. I like MP2, but there's also the AAC, AC3, and MP3 formats. The Bitrate affects the quality of the audio. When you have multiple audio strips, Blender will go ahead and blend the two audios together, kind of like audio mix them, and so the way you control the mixing there is by the Gain control and animating the Gain control, as I've shown you with the IPO window. So that's the essentials of working with audio and multiple audio tracks in Blender and also then encoding that audio in your output video.
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