Recording Sound Using Audacity
- Making Movies Suitable for YouTube Using Seamless3d and FFmpeg
- Moving the Camera
- Adding a Sound Track
- Recording Sound Using Audacity
- Specifying Different Movie Formats
- Creating High Definition Movies for YouTube
- Rendering the Frames Using POV-Ray
In this tutorial we shall record a sound track using Audacity. Audacity is free open source software avilable for download from: audacity.sourceforge.net
Open Audacity.
Click record
and speak some words into the microphone.
When finished speaking the words click stop
If audacity shows the wave-form (shown in blue) for our recording to not venture far from the middle:
it is too quiet.
If it reaches the limit:
it is too loud.
We should aim for it looking something like this:
Before clicking the record button again close the current track:
Otherwise we will record it too onto a new track unless we mute it or turn the speaker volume right down.
To get the optimum level for the microphone select Mic in Audacity's drop down control and use it's level slider:
The time-line above the recorded track is in seconds. Knowing that our movie lasts for 2 seconds we can see if our recorded words are located at the right time. In the following example the words end to late and so a portion of silence is selected (by dragging the mouse):
and cut 
out.
Because FFmpeg will use the sound track to detimine the length of the movie we should aim for the sound track to last a fraction more than the duration of the movie. The example movie lasts 2 seconds.
When we are happy with our sound track export it as a wav file.
Save the sound track to the same folder we have all the files for our movie located
in with the name build_av.wav:
We use the name build_av.wav because the batch file that was generated by Seamless3d will specify this file name (the same file name used by the smls file).
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