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To stop unintended silence between tracks, fix the transition in the audio playout chain before it reaches YouTube Live. Liquidsoap can sequence a playlist with a built-in crossfade operator, or you can use a custom transition. Choose gapless sequencing when tracks should meet without overlap; choose crossfading when a deliberate overlap suits the music. A crossfade is not the same as gapless playback, and it will not fix silence already inside a file or an interruption elsewhere in the stream.
Find where the silence is coming from
Before changing settings, identify the kind of gap. A transition operator can address the boundary between scheduled tracks; it cannot repair every source of silence or an interrupted connection.
- At a file boundary: Check whether the playlist is advancing correctly and whether the tracks themselves contain silence at their ends or beginnings.
- Inside a track: The silence is part of the source audio. A crossfade between files does not remove it.
- When sources switch: A playlist-to-live or fallback-source change may follow different track-switching behavior from a file-to-file transition.
- After an interruption: A transport or network interruption is distinct from a track-boundary gap. Crossfade alone does not establish that it has been resolved.
Listen to the outgoing program audio around the boundary, rather than relying only on whether YouTube receives an ingest connection. Liquidsoap’s documented workflow builds transitions on the playlist-derived source before sending the resulting stream onward.
Choose gapless sequencing or crossfade
Gapless sequencing
Gapless sequencing means one track follows another without an intentional overlap. Use this when the arrangement depends on a precise handoff, such as music intended to run continuously. The tracks still need suitable boundaries: software cannot make source audio with a silent tail behave as though that silence were absent.
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Crossfading
A crossfade overlaps the end of one track with the beginning of the next. It can soften a break, but it changes the timing and mixes the tracks together. Intros, outros, loudness differences, and music designed to flow continuously can make a fixed overlap sound wrong. Treat it as a listening choice, not a universal repair for gaps.
Custom transitions
Liquidsoap also documents custom transition logic. Its cross mechanism can base a transition on average volume near the end of the outgoing track and beginning of the incoming one. That provides an alternative to applying one identical transition to every pair; the right behavior depends on the audio and configuration.
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Set up playlist transitions with Liquidsoap
Liquidsoap’s documented radio workflow creates a playlist-derived source, applies crossfade to it, and then outputs the stream. The project describes Liquidsoap as a tool for building audio and video streams, including internet radio and RTMP to YouTube: Liquidsoap project homepage. The exact configuration depends on your installed version, source types, and clock setup, so use the project documentation for the syntax matching your installation.
- Confirm the playlist is healthy. Check that the source is loading the intended files and scheduling the next track. A transition cannot compensate for a playlist that fails to advance.
- Apply the transition to the playlist source. Liquidsoap’s documented example applies its
crossfadeoperator to the playlist-derived radio source, upstream of output to the destination. See the Liquidsoap crossfade documentation. - Choose the intended sound. Start with the documented operator, then listen to representative pairs. If overlap is unwanted, configure for a gapless handoff rather than describing or treating a crossfade as gapless playback.
- Check version and dependencies for automated crossfade. Liquidsoap documents automated crossfade transitions as integrated since release 2.2.5. The documented simple activation uses
enable_autocue_metadata()when FFmpeg bindings are enabled. Verify that your installed version and bindings match before relying on this facility. - Test the outgoing audio. Listen across several transitions in the program audio sent to YouTube, including pairs with different loudness and different types of intros or endings.
Liquidsoap’s documentation describes its built-in operator and custom transitions, but not a single configuration guaranteed for every deployment. Consult the documentation for the version you actually run: crossfade setup and behavior.
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Account for mixed sources and timing
File playlists versus live or hardware inputs
Liquidsoap’s reference says file sources default to track-sensitive switching, while live network and hardware inputs default to non-track-sensitive behavior. If a playlist is combined with a live, network, or hardware source, inspect the source’s track sensitivity and switching behavior rather than assuming every change happens at a track boundary. See the Liquidsoap reference.
Clock conflicts and buffering
Crossfade lookahead needs timing flexibility. A source that controls its own timing can conflict with that requirement. Liquidsoap documents buffer as the standard bridge between clock domains and warns that unbuffered clock drift can eventually cause glitches. If timing or clock errors appear with live, network, or hardware-timed sources, follow the project’s clock guidance and assess whether buffering is needed. Do not treat disabling synchronization without buffering as a general fix.
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Troubleshoot a gap that remains
| What you hear or see | What to check | Next step |
|---|---|---|
| Silence only at a track boundary | Playlist advancement, source-file endings and beginnings, and whether the transition is applied to the playlist-derived source. | Correct the playlist or file boundary, then test the intended gapless or crossfade behavior. |
| Silence within a song | The audio file itself. | Inspect or edit the source audio; a track-transition operator does not remove internal silence. |
| A gap when switching between file and live, network, or hardware sources | Track sensitivity and switching defaults for each source type. | Review the Liquidsoap reference and configure the source combination for the desired switching behavior. |
| Timing errors, drift, or glitches with lookahead | Whether a source controls its own clock and whether clock domains are bridged. | Consult Liquidsoap’s clock guidance and use buffering where appropriate. |
| Automated crossfade is unavailable | Installed Liquidsoap version and FFmpeg bindings. | Check for version 2.2.5 or later and the required bindings for the documented automated setup. |
| Transitions sound worse on some pairs | Relative loudness, intros and outros, and whether tracks are intended to run continuously. | Compare a no-overlap handoff, the built-in crossfade, and a tailored transition on representative tracks. |
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