How to fade out a song after crossfade (liq_cross_duration) and ignore the rest of the song?

[ArvyRogerio]

Hi, I have a song with a long (~25 secs) end. I want to trigger the next song (using liq_cross_duration) and then fade (~5 secs) and ignore the rest of the song (~13 secs).

liq_cross_duration works, it triggers in the right point. But the "old" song is still in background... I want to fade out it for 5 secs after the point set with liq_cross_duration (green piece), so, ignore (not play) the rest (brown piece).

I tryed:
music = crossfade(id="cross_music",fade_in=0.,fade_out=5.,duration=0.,music)

liq_cross_duration is set using "annotate:"

Any ideas?

Note: still using version 1.4.4.

[gAlleb]

Hi! Very old version!

There was a cue_cut operator. You can annotate a file in a playlist like annotate:liq_cue_in=0.0,liq_cue_out=20.,liq_fade_out=5.0:/path/to/file

s = playlist("pl.m3u")
s = cue_cut(s)

https://www.liquidsoap.info/doc-1.4.4/seek.html

It's hard to give you an advice with such old LS version.
Consider upgrading)

[ArvyRogerio]

Great, so, in this case, if I set fade_out to 5s, it will fade from 01:55, and stop, so, nothing after 02:00 is played, right?
(based on the original song)
Thanks for the additional info, this will help to improve my script.

[ArvyRogerio]

I did some tests. Now fade_out works but not liq_cross_duration... :(

Example:

• song size: 82s
• cue in: 0.2s
• cue out: 47.6s (because it has a useless 34.4s of almost blank)
• cross duration: 5s
• fade out: 5s

Starts ok at 0.2s and start fading out correctly at 47.6s, fade out ok for 5 secs, but the "next song" do not "mix" at the beginning of the fade (since I set cross and fade out for 5 secs).

Any idea? 😌

liq_cross_duration is calculated by the end of the audio, even when "trimming" it using cut in and cue out?

Thanks again!

[gAlleb]

Really not sure what is happening there. Version is too old. Crossfade logic since has been rewritten many times.

If you are using cross duration as annotation - maybe using it directly in crossfade function will change something. Maybe playing with cross duration value will give you some results. Like increasing it a bit to 6-8 seconds or decreasing)

In new versions we have liq_cross_start_next which explicitly tells the crossfade where to start next song. Along side "liq_fade_in_delay", "liq_fade_out_delay" and other stuff. Not countting various autocue implementations thatt will automatically calculate all the values for you on the fly and will give you options to select how you wanna treat songs with long endings.

[ArvyRogerio]

Thanks, I'll try a little more... Well, if the combination "cue in + cue out + fade out + mix position" works better in the new version, I need to consider recreate the .liq file... Several days of work. But I really need to fix this.

I have some customers with +30s in the end of the song with less than -25 dB, and I want to detect and skip to the next song, doing the fade out and mixing/overlapping. Basically detecting a point, and doing a 5s mix together with a 5s fade out.

Hope my idea is correct and viable with LS.

[gAlleb]

Internal autocue has this settings https://github.com/savonet/liquidsoap/blob/main/src/libs/autocue.liq which you can alter

let settings.autocue.internal.cue_in_threshold =
  settings.make(
    description=
      "Cue in threshold",
    -34.0
  )

let settings.autocue.internal.cue_out_threshold =
  settings.make(
    description=
      "Cue out threshold",
    -42.0
  )

cue_file autocue has them as well but needs tweeking to work with LS versions >= 2.3.0 - https://github.com/Moonbase59/autocue/