To prevent silence at song boundaries, fix the transition in the audio playout chain before it reaches YouTube Live. Liquidsoap provides a playlist-based crossfade operator and customizable transitions; use a clean gapless handoff when tracks should not overlap, or crossfade when an overlap suits the music. A crossfade is not the same as gapless playback, and it will not fix silence inside a file or an interruption elsewhere in the stream.
First identify what kind of gap you hear
Listen to the program audio around the silence, not just the YouTube ingest connection. The remedy depends on where the interruption occurs:
- Between two files: inspect playlist scheduling and the transition applied when one track ends and the next begins.
- Inside a file: a playout transition cannot remove silence that is part of the recording. Check or edit the source file if that silence is unintended.
- When switching sources: check how the playlist, live input, or fallback source handles track boundaries.
- After a transport or network interruption: a track crossfade alone does not establish that this separate interruption has been resolved.
Choose gapless sequencing or crossfade
Gapless sequencing
Gapless sequencing moves from one track to the next without an intentional overlap. Choose it when an overlap would disrupt a continuous mix, a musical phrase, or the intended ending of a track. The actual handoff still depends on the playout system and the audio files; check that the files do not contain unwanted silence at their boundaries.
Crossfade
A crossfade overlaps the end of the outgoing track with the beginning of the incoming track. It can mask a short boundary pause, but it changes the arrangement and may sound wrong when tracks have long intros or outros, substantially different loudness, or endings meant to stand alone. Liquidsoap documents a built-in crossfade operator and custom transition behavior. Listen to representative pairs rather than assuming one setting suits every song. See the Liquidsoap crossfade documentation.
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Set up transitions in Liquidsoap
Liquidsoap applies transitions to the playout source, before the stream is sent to its destination. Its documented radio workflow builds a source from a playlist, applies crossfade, and then outputs the resulting stream. The exact configuration depends on your installed version, source types, and clock setup; use the documentation for your version rather than copying a configuration blindly.
- Check the playlist and scheduling. Confirm the source can read the files and that the next track is available when the current one ends. Liquidsoap’s project documentation describes playlist-based radio and output workflows.
- Choose the intended transition. For overlapping tracks, apply Liquidsoap’s documented
crossfadeoperator to the playlist-derived source. For a no-overlap result, configure and verify the handoff for your setup rather than treating crossfade as gapless playback. - Verify version and dependencies for automatic crossfade. Liquidsoap documents its automated crossfade mechanism as integrated since version 2.2.5. The documented simple activation uses
enable_autocue_metadata()when FFmpeg bindings are available. Check your installed Liquidsoap version and whether those bindings are enabled before relying on this path. Details are in the crossfade guide. - Test the actual material. Listen to several transitions, including tracks with quiet openings, loud endings, and very different levels. Adjust the transition to suit the music; the documentation does not establish one setting that is optimal for every playlist.
- Check the outgoing audio. Confirm the transition is audible in the program output before troubleshooting YouTube’s connection. The transition is constructed upstream of the destination.
When one default transition is not enough
Liquidsoap’s cross mechanism can use average volume near the end of the outgoing track and beginning of the incoming track to inform a transition. This gives you a way to tailor transitions instead of applying one blunt overlap to every pair. It is a configuration choice, not a guarantee that the result will suit every musical style.
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Mixed playlists and live sources need extra care
Source type affects switching behavior. Liquidsoap’s reference says file sources default to track-sensitive switching, while live network and hardware inputs default to non-track-sensitive behavior. If you combine a playlist with a live or fallback source, inspect those settings rather than assuming every source changes at a track boundary. See the Liquidsoap reference.
Resolve timing and clock problems
Crossfade lookahead needs timing flexibility. A live, network, or hardware-timed source that controls its own timing can conflict with the timing expected by another part of the pipeline. Liquidsoap documents buffer as the standard way to bridge clock domains and warns that unbuffered clock drift can eventually cause glitches. If a transition reports a timing or clock issue, consult the clock documentation and assess whether buffering is appropriate. Do not assume that disabling synchronization without a buffer is a reliable fix.
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Troubleshoot by symptom
| Symptom | Likely area to inspect | Next step |
|---|---|---|
| Silence occurs only between particular files | The file boundaries or the transition for those tracks | Check whether silence is encoded in either file; listen to that pair and adjust the transition if needed. |
| Every playlist boundary has a pause | Playlist scheduling or the handoff in the playout chain | Confirm the next track is available and verify that the transition is applied to the playlist-derived source. |
| Crossfade is unavailable or does not behave as expected | Liquidsoap version or FFmpeg bindings | Check the installed version and bindings; the documented automated mechanism is integrated since 2.2.5 and its simple setup uses enable_autocue_metadata() when FFmpeg bindings are enabled. |
| Transitions fail or glitch with a live or hardware input | Clock domains and source timing | Review the source switching and clock setup; Liquidsoap documents buffering as the standard clock-domain bridge. |
| Audio is clean locally but a gap appears after an interruption | The transport or source interruption, not necessarily the track transition | Investigate that interruption separately; crossfade addresses track transitions, not every cause of lost audio. |
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