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Put loudness control in the audio chain before the live encoder, then check both integrated loudness and true-peak headroom on the encoded output. For a stable music library, normalize files offline; for a changing playlist, use a processor that can normalize continuously. EBU guidance gives useful reference levels, but it does not establish a numeric YouTube live-stream target.
Choose where normalization happens
The right processing point depends on whether the playlist is fixed or changes while the stream is running. FFmpeg’s loudnorm filter supports double-pass normalization for files and single-pass operation for livestreams.
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- Stable library: Measure and prepare tracks offline, then play the prepared files into the live encoder. This reduces the amount of processing required during the broadcast.
- Changing playlist: Use a live-capable processor in the audio path before the encoder so newly selected material is treated as it plays.
In either setup, put the loudness processor before the final live encoder. A meter placed only before processing cannot tell you what the processed, encoded stream sounds like.
Choose a target without mistaking it for a YouTube rule
The European Broadcasting Union’s EBU R 128 version 5.0, published 21 November 2023, recommends average programme loudness of -23 LUFS. Its streaming supplement, EBU R 128 S2 version 3 (November 2023), describes -23 LUFS as the baseline for programmes streamed unchanged. In a different scenario—when metadata is not used to manage device gain and content dynamics, and the broadcaster wants to control dynamic treatment before streaming—it says distribution loudness may be raised into the -20 to -16 LUFS range. See the EBU R 128 recommendation and EBU R 128 S2.
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These are context-specific broadcast recommendations, not verified YouTube live-stream requirements. The available official information does not establish that YouTube applies loudness normalization to continuous live streams or publishes a numeric target for them. Do not treat the often-repeated -14 LUFS figure as an established rule for a 24/7 YouTube stream.
Set up the processing and checks
For a prepared file library
- Measure representative tracks. Include quiet and loud material, as well as different genres or album masters. Use a loudness-aware analyzer that reports integrated loudness and true peak.
- Choose an explicit target. Use a documented reference such as the EBU baseline when it suits your distribution context, or choose another operational target deliberately. Do not leave a processor default unexamined.
- Use FFmpeg’s file workflow. The FFmpeg loudnorm documentation describes double-pass operation for files. Measure first, then use the measurements when rendering the normalized version.
- Set a true-peak ceiling. loudnorm exposes integrated loudness, loudness range and maximum true-peak targets. Select a ceiling that leaves suitable headroom for your encoding chain; the cited sources do not specify a YouTube-mandated ceiling.
- Listen to transitions. Check the quietest and loudest tracks and playlist changes. Loudness matching should not flatten the music unnecessarily or make every track sound dynamically identical.
- Inspect the final output. Measure and listen to the chain after the live encoder as well as the prepared files. Note integrated loudness and peak readings, then adjust if transitions are conspicuously uneven or peaks approach clipping.
For a changing playlist or live source
- Insert a live-capable loudness processor before the encoder. FFmpeg documents loudnorm single-pass operation for livestreams; a live processor is also needed if the playlist changes dynamically.
- Set the intended loudness and range targets. Make the chosen target explicit and consider how much dynamic contrast should remain between songs.
- Configure maximum true peak separately. Integrated loudness describes average programme level; true peak is a separate headroom check. Do not assume matching LUFS alone prevents clipping.
- Monitor real programme material. Listen across quiet-to-loud changes and transitions, not only during a single representative track.
- Verify after encoding. Check the stream output with a loudness-aware analyzer and confirm that peaks remain below clipping. Keep a record of measured loudness and peak values so changes to the chain can be evaluated.
Read meters correctly
OBS’s standard mixer meter is not an integrated LUFS meter. OBS documents its mixer as a sample-peak programme meter; its VU display measures RMS over 300 ms. Its technical guidance says output should remain below 0 dBFS, the digital maximum, to avoid clipping. See OBS’s Audio Mixer Guide.
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Use a loudness-aware meter or analyzer to check integrated LUFS and true peak. The EBU publishes a loudness metering specification; dedicated hardware is optional, not a requirement for this workflow. Peak bars can help reveal overloads, but they do not establish integrated programme loudness.
Troubleshoot common loudness problems
- Songs still sound uneven although their peak levels match: Peak matching is not perceived-loudness matching. Measure integrated loudness and review the processor’s loudness target.
- The meter looks safe, but the encoded stream clips: A pre-encoder meter does not account for everything in the final chain. Check the encoded output and leave true-peak headroom; keep the output below 0 dBFS.
- Quiet passages sound unnaturally loud or the music feels flattened: Revisit loudness-range and peak-processing settings. Listen across varied tracks and preserve the dynamics appropriate to the programme.
- Track changes cause sudden level jumps: Compare adjacent tracks using integrated loudness, then adjust file preparation or live processing and recheck the transition.
- OBS bars are being read as LUFS: They are not integrated loudness readings. Use a loudness-aware analyzer for LUFS and true-peak verification.
- A setting is being justified as “YouTube’s -14 LUFS requirement”: The sources cited here do not verify a numeric YouTube live target. Treat the chosen value as your operating decision or a standards-based reference, not a confirmed platform rule.
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If your goal is to keep a pre-recorded YouTube radio stream online without leaving a computer running at home, StreamNeo runs uploaded videos or playlists from the cloud. Upload your recording or build a playlist, add your YouTube stream key once, and go live. It does not normalize loudness for you, so prepare and check your audio before uploading. Your computer and home connection do not have to stay on, and StreamNeo automatically recovers if YouTube drops the stream. Any uploaded quality up to 4K 60fps streams as made at one flat price per slot. The first day is free with no card required. Monthly pricing is $9.99 per month. For Indian creators, UPI is supported. Start your free day with StreamNeo.
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