I'm successfully experimenting with Liquidsoap, and am grateful to its writers.
Before writing my own function, I wonder if anyone has worked on this question before? I'd like the system to perform automatic crossfades (actually, superimposed playing without fades) which begin when the loudness of the first piece of audio falls to a pre-set level, e.g. 12dB below the average level of the last minute of the track. I notice the 'cross' operator allows reading a piece of metadata which could be set to mark a trigger point for the next track. I can quickly analyse my whole music library using FFmpeg's EBU R.128 algorithm to provide these trigger points (look backwards from the track end for the final point where volume passes downwards through a given value). But I don't know how to use the 'cross' function in a crossfading function that would apply to whole playlists. This is similar to the "Continuator" in foobar2000. It works equally well spotting end cue points for voice tracks and music which has a dead end, as well as for music that fades out. Experimentation with the 'smart' functions doesn't seem to show them detecting the fade-out of a track, but relying on a fixed duration fade over the end of a track. Have I missed something here? You may already know how to do this, and I've missed it in the documentation, which would be a matter of regret for me! Kind regards, John Warburton
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