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To prevent gaps between songs, fix the transition in the audio playout chain before it reaches YouTube Live. For a playlist-based setup, Liquidsoap provides a built-in crossfade operator and customizable transitions. Choose a gapless handoff if you want songs to follow without overlap, or crossfade if you want the end of one track to overlap the start of the next.
First identify what kind of gap you hear
A track transition is only one possible source of silence. Find where it occurs before changing settings: a crossfade can address a boundary between tracks, but it cannot remove silence that is already inside a file or repair every source-switch or network interruption.
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- Between two playlist tracks: check playlist scheduling and the transition behavior in the playout source.
- Inside one track: inspect the audio file. A transition between files will not remove silence embedded in the recording.
- When switching between a playlist and a live, network, or hardware source: inspect source-switch behavior and track sensitivity.
- After a transport or network interruption: investigate that interruption separately; a crossfade is not a general-purpose continuity fix.
Choose gapless sequencing or crossfade
Gapless sequencing
Gapless sequencing puts the next track immediately after the previous one without intentionally overlapping them. Use this when you want a clean boundary, especially for music whose phrasing or rhythm should not blend across tracks.
Crossfade
A crossfade overlaps the outgoing track’s ending with the incoming track’s beginning. It can soften a boundary, but it is not the same as exact gapless playback. The right overlap depends on the tracks: differences in loudness, long intros or outros, and music intended to run continuously can make a fixed transition sound unnatural. Listen to representative pairs before settling on a transition.
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Set up playlist transitions with Liquidsoap
Liquidsoap’s documented radio workflow applies crossfade to a playlist-derived source before sending the resulting program to its destination. That placement matters: transitions are made in the playout chain, upstream of YouTube’s ingest connection. The exact configuration depends on your installed version, source types, and timing setup.
- Check the playlist and scheduling. Confirm the playlist source is healthy and that the next track is available when expected. Liquidsoap’s documented radio example builds a source from a playlist and applies the transition to that source. See the Liquidsoap project homepage.
- Decide on the audible result. Choose a no-overlap handoff or an intentional overlap. Start with Liquidsoap’s documented
crossfadeoperator if you want to test a crossfade; do not assume that crossfade means gapless playback. - Check your Liquidsoap version and dependencies. Liquidsoap documents automated crossfade transitions as integrated since version 2.2.5. The documented activation path uses
enable_autocue_metadata()when FFmpeg bindings are available. Verify that your installation has the needed bindings before relying on this method. See the Liquidsoap crossfade documentation. - Listen to the outgoing program audio. Test several representative transitions in the output of your playout chain, not just whether YouTube shows an active ingest connection. Adjust the transition to suit the actual material.
Customize transitions and mixed-source behavior
Liquidsoap’s cross mechanism can base a transition on average volume near the end of the outgoing track and the beginning of the incoming track. This gives you an option beyond applying one fixed behavior to every pair. Use it when a uniform transition does not suit the playlist, and evaluate the result with the tracks you actually play.
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Source boundaries also matter. Liquidsoap documents file sources as track-sensitive by default, while live network and hardware inputs default to non-track-sensitive behavior. If you combine a playlist with a live or fallback source, check those defaults rather than assuming every handoff will happen at a track boundary. See the Liquidsoap reference.
Resolve timing and clock problems
Crossfade lookahead needs timing flexibility. A live, network, or hardware source that controls its own timing can conflict with the timing expected by the transition. Liquidsoap documents buffer as the standard way to bridge clock domains. Its clock guidance warns that unbuffered clock drift can eventually cause glitches. If a transition reports a timing or clock problem, review the source clocks and buffering rather than simply disabling synchronization. See the Liquidsoap clock documentation.
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Troubleshoot persistent gaps
| What you hear | Likely area to inspect | What to do |
|---|---|---|
| A pause at every playlist boundary | Playlist availability, next-track scheduling, or transition configuration | Confirm the playlist source supplies the next track, then check how the transition operator is applied to the playlist-derived source. |
| A pause only in particular recordings | Silence inside the audio file or an unusually long intro or outro | Inspect the recording and test the pair. A crossfade may not be appropriate for every track. |
| A gap when switching to or from a live or fallback input | Source track-sensitivity and switching defaults | Check the source types and their documented defaults; do not assume a live input behaves like a file playlist. |
| Glitches or timing errors after enabling lookahead | Clock conflict between the transition and a self-timed source | Review Liquidsoap’s clock guidance and use buffering where needed to bridge clock domains. |
| The playout sounds continuous, but YouTube loses the stream | Transport or ingest interruption rather than a track-boundary transition | Treat it as a separate delivery problem. Crossfade only addresses transitions in the playout chain. |
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