Audio synchronisation / alignement

[brian]

@andrecaldas

Actually, since I do not really know Shotcut and I do not know much about MLT, I thought about doing it inline, as a producer/tractor defined on the same file. Then, I thought about having some dialog with some options.

I think that could also work, but would need a way to indicate that the producer is actually two producers joined with a tractor.

@andrecaldas

Can a single AV file have lots of audio tracks in Shotcut?

Yes. But Shotcut only uses one track at a time, currently.

@andrecaldas

Does “ripple” have a formal definition?

Timeline > Ripple All Tracks

Ripple All Tracks has the icon [image] in the Timeline toolbar and menu. Here is how it works: Only applies when ripple mode (Ripple trim and drop) is also on: [image] Or when using an edit operation that ripples: Cut or Remove (Ripple Delete). Only affects the clips after the moved clip on the same track. Affects footage after the original start position of the moved clip on other tracks (I use the term “footage” when I mean there is a time range and not strictly whole clips, and that often…

@andrecaldas

So, given a reference track, when you drag an audio clip “below” a reference “track”, the “ripple” magic chooses the correct reference clip and aligns to it? It could even “group” both, and even “trim”, so they have the same length…

Just thinking out loud here… Here is an idea how how it could work:

• User places reference audio on track 1.
• Users adds video/audio clips to other tracks - maybe one track for each camera
• User right-clicks on a clip and chooses an option to “Align with audio in Track 1”. Maybe this option could also exist on each track
• When the users chooses “Align with audio in Track 1”, a process kicks off to analyze the audio in each clip and compare it to the audio in Track 1. Then, the process sets the position of the clip to align it. This alignment process would be the “magic”.

@andrecaldas

By the way, I read somewhere about “assigning copyright”. But the Kdenlive code is not mine (and could never be… I have no idea how it does its fft magic). Can it be used? It seems it is GPLv3, but I am not sure it allows for “any later GPL”. I guess it does, because it also (seems to) accepts any KDE accepted GPL.

I do not know how Kdenlive aligns clips or if that could be adapted to my suggestion above.