OpenShot Video Editor

overlap an audio track

Asked by PBraga

If I overlap a video track on top of other, only the upper one will be seen. Only if I apply a filter (like the nice "Chroma key") I'll have the transparent pixels of the upper layer replaced (or mixed if not completely transparent) by the following visible pixel of the lower tracks. This is very nice.

Now, my question: cant I do the same thing with audio? i.e., add an audio track and be able to configure it in a way that will cut the lower layer audio. We could even configure a percentage of the volume of the lower layers (tracks) audio. So, now we have 100% always. If I set, for example, 50%, I would have 100% of the audio I'm configuring mixed with 50% of the volume of the lower tracks. If I select 0%, than the audio would completely eliminate the lower ones.

I needed this because I was editing a home-made video and I would like to replace some "bad" words with a "piiii" sound. :)

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Hans Petter Birkeland (hanspb) said : 		#1

I think you would have to cut away the underlying audio.

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PBraga (pls-braga) said : 		#2

Hi Hans,

Thanks for you answer.

Yes, I had already solved my problem that way.
Took the audio off the video, edited it with a audio editor.
Then, on OpenShot I muted the video layer and placed the new audio in another track.
I thought this would be difficult to synchronize the audio with the original video, but it was easy (I don't know if OpenShot "recongnizes" that the new audio track is similar to the audio of another video track).

Anyway, it would be much easier if I could overlap, on OpenShot, the audio of a layer by just placing another audio on top of it with... let's call it an audio alpha channel :P to control the amount of mixing I want to do between the layer and the ones below. (if transparent, then mix 100% with 100% of both audio channels, if not opaque mix 0% of underlying audio with 100% of the channel audio; other values between would be possible... exactly like the video alpha channel)

So, my suggestion still applies, although I already solved the problem by "cutting away the underlying audio". :)
It is just an improvement suggestion.

Regards,
Pedro Braga

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