I finally decided to change my workflow (which was frankly wrong).
Now, first I create a script. Then I record my voice using Teleprompter (I’m trying to do the whole project in Linux Ubuntu Studio).
Then I adapt the length of the different animations and slides to the audio.
So…yes, I started from scratch and most of the video editing I will not take advantage of it. I don’t know when I will finish this video.
Today I spent an hour for a recording with two minutes of voice. 
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