Oh, I forgot, this will only with if you remove track marks on the live source,
otherwise it would also cross-fade the live tracks, which will not work. Fixed
script:
```
# This is to make sure that we always do a fade transition:
def smart_crossfade (~start_next=5.,~fade_in=3.,~fade_out=3.,
~default=(fun (a,b) -> sequence([a, b])),
~high=-15., ~medium=-32., ~margin=4.,
~width=2.,~conservative=true,s)
fade.out = fade.out(type="sin",duration=fade_out)
fade.in = fade.in(type="sin",duration=fade_in)
add = fun (a,b) -> add(normalize=false,[b, a])
log = log(label="smart_crossfade")
def transition(a,b,ma,mb,sa,sb)
list.iter(fun(x)-> log(level=4,"Before: #{x}"),ma)
list.iter(fun(x)-> log(level=4,"After : #{x}"),mb)
log("Transition: crossed, fade-in, fade-out.")
add(fade.out(sa),fade.in(sb))
end
smart_cross(width=width, duration=start_next, conservative=conservative,
transition,s)
end
live = input.harbor("test")
live = merge_tracks(live)
live = buffer(fallible=true,buffer=10.,live)
pl = playlist("~/Music")
s = fallback(track_sensitive=false,[live,pl])
s = on_metadata(print,s)
s = smart_crossfade(s)
```
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