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Start the lecture and watch the OBS audio meter for the source that should capture it. If the meter does not move, OBS is not receiving audio from that source. If it moves, trace the signal onward: monitoring, recording, and the YouTube stream can each reveal where sound is being lost.
Find where the audio signal stops
Work from the lecture playback toward the viewer, changing one thing at a time. A moving meter confirms that audio is reaching that OBS source; it does not by itself prove that OBS is sending audio to YouTube.
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- Play the lecture and check the relevant OBS meter. Confirm the lecture itself is playing with sound, then watch the meter for the source expected to capture it.
- If the meter stays still, check capture. Verify the playback output, selected application or desktop device, and source type. The right setup depends on whether the lecture plays in a browser, an OBS media source, or another application, as well as the computer’s operating system. OBS documents these as distinct capture paths; see its Knowledge Base.
- If the meter moves, test OBS monitoring. In OBS, open Edit → Advanced Audio Properties and check the source’s monitoring setting and selected monitoring device. Listen through that device. Also check whether the source is muted, its fader level, and any filters. OBS explains source monitoring in its Audio Mixer Guide.
- Make a short local recording and listen to it. If monitoring works but the recording is silent, inspect the audio output or track selected for recording. If the recording has sound but the live stream does not, that points to a difference in live output or routing; it is a diagnostic clue, not proof of a particular cause.
- Check the encoder’s live output. YouTube recommends checking the sound directly in the encoder and reviewing the local archive and encoder errors when troubleshooting stream quality. Its guidance is in Troubleshoot your YouTube live stream.
- Compare reports from viewers. If the encoder output has sound but one viewer hears none, check playback on another device or connection. YouTube says an issue reported by one viewer often points to that viewer’s computer or connection; reports from viewers on different connections can indicate an encoder problem.
Use the test results to choose the next check
| What you observe | What it suggests | Next check |
|---|---|---|
| The lecture plays, but the OBS source meter does not move | The capture or input path is not reaching that source. | Check playback output, capture device or application, source type, and platform-specific capture steps. |
| The meter moves, but OBS monitoring is silent | The source, its filters, or the monitoring-device path may be wrong. | Check mute and fader state, filters, monitoring device, and Advanced Audio Properties. |
| Monitoring works, but the local recording is silent | Recording output or track selection may differ from monitoring. | Check the selected audio output or track and recording configuration. |
| The local recording has sound, but the live stream does not | Live output or stream routing may differ from local capture. | Check the encoder’s live output and which source or track reaches the stream. |
| The encoder output has sound, but a viewer reports silence | The issue may be specific to that viewer’s playback or connection. | Compare another device or network and review YouTube live metrics. |
These are diagnostic interpretations, not confirmed causes. YouTube’s guidance is to compare encoder output and viewer reports rather than assume that a silent playback on one device means the entire stream is silent.
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When the problem comes and goes
A 24/7 schedule does not, by itself, change the first-line audio checks. Note when the sound stops, then check whether the lecture playback remains active and whether the selected device or application changes at that time. A meter that stops moving points back toward playback or capture; a meter that continues moving means you should continue checking monitoring, recording, and live output.
#1 Best Overall
Focusrite Scarlett Solo 3rd Gen USB-C Audio Interface
- Pro performance with great pre-amps - Achieve a brighter recording thanks to the high performing mic pre-amps of the Scarlett 3rd Gen. A switchable Air mode will add extra clarity to your acoustic instruments when recording with your Solo 3rd Gen
- Get the perfect guitar and vocal take with - With two high-headroom instrument inputs to plug in your guitar or bass so that they shine through. Capture your voice and instruments without any unwanted clipping or distortion thanks to our Gain Halos
- Studio quality recording for your music & podcasts - Achieve pro sounding recordings with Scarlett 3rd Gen’s high-performance converters enabling you to record and mix at up to 24-bit/192kHz. Your recordings will retain all of their sonic qualities
- Low-noise for crystal clear listening - 2 low-noise balanced outputs provide clean audio playback with 3rd Gen. Hear all the nuances of your tracks or music from Spotify, Apple & Amazon Music. Plug-in headphones for private listening in high-fidelity
- Everything in the box: Includes Pro Tools Intro+, Ableton Live Lite, Cubase LE, and Hitmaker Expansion: a suite of essential effects, powerful software instruments, and easy-to-use mastering tools
Or let it run in the cloud
If you want to remove the always-on computer from the setup, StreamNeo keeps a YouTube channel live from uploaded videos: upload a recording or build a playlist, add your YouTube stream key, and go live. It runs in the cloud, so nothing has to stay on at home. Each slot streams the uploaded quality up to 4K 60fps at one flat price, with automatic recovery if YouTube drops the stream. The first day is free with no card; the monthly option is $9.99 per month.
Quick Recap
Bestseller No. 1
Bestseller No. 2
Bestseller No. 4
Bestseller No. 5
Best Value
Focusrite Scarlett 2i2 4th Gen USB-C Audio Interface
- The new generation of the artist's interface: Connect your mic to Scarlett's 4th Gen mic pres. Plug in your guitar. Fire up the included software. Start making your first big hit
- Studio-quality sound: With a huge 120dB dynamic range, the newest generation of Scarlett uses the same converters as Focusrite’s flagship interfaces, found in the world's biggest studios
- Never lose a great take: Scarlett 4th Gen's Auto Gain sets the perfect level for your mic or guitar, and Clip Safe prevents clipping, so you can focus on the music
- Find your signature sound: Air mode lifts vocals and guitars to the front of the mix, adding musical presence and rich harmonic drive to your recordings
- With Scarlett 4th Gen, you have all you need to record, mix and master your music: Includes industry-leading recording software and a full collection of record-making plugins
Rank #4
M-AUDIO M-Track Duo USB Audio Interface
- Podcast, Record, Live Stream, This Portable Audio Interface Covers it All - USB sound card for Mac or PC delivers 48kHz audio resolution for pristine recording every time
- Be ready for anything with this versatile M-AUDIO interface - Record guitar, vocals or line input signals with two combo XLR / Line / Instrument Inputs with phantom power
- Everything you Demand from an Audio Interface for Fuss-Free Monitoring - 1/4" headphone output and stereo 1/4" outputs for total monitoring flexibility; USB/Direct switch for zero latency monitoring
- Get the best out of your Microphones - M-Track Duo’s transparent Crystal Preamps guarantee optimal sound from all your microphones including condenser mics
- The MPC Production Experience - Includes MPC Beats Software complete with the essential production tools from Akai Professional
Rank #3
SABRENT USB External Stereo Sound Card Adapter, Plug & Play (AU-MMSA)
- PLUG IN AND HEAR SOUND IN SECONDS - USB Type-A connector with a 3.5mm stereo headphone output and a separate 3.5mm mono microphone input. No drivers, no software, no external power - the adapter is USB bus-powered and is recognized as a standard USB audio device.
- WORKS ON WINDOWS, MAC AND LINUX - Driverless on Windows 98SE/ME/2000/XP/Server 2003/Vista/7/8, Linux and Mac OSX, and compliant with the USB Audio Device Class 1.0 specification, so any system that supports class-compliant USB audio will see it. Select it as the sound output and input device after plugging it in.
- TWO JACKS, TWO JOBS - The green jack is stereo OUT for headphones or powered speakers; the pink jack is mono microphone IN for a 3.5mm mic. It does NOT support 4-pole headsets on a single combo plug, it does NOT power passive speakers, and it does NOT add surround sound - it is a stereo 2-channel adapter.
- FOR LAPTOPS AND DESKTOPS THAT NEED AN AUDIO PORT BACK - Adds a headphone and mic port to a laptop, desktop, or mini PC whose onboard jack has failed or was never there. Managed and work-issued computers can block new USB audio devices by policy - check with your IT department before ordering for a company machine.
- SABRENT SUPPORT AND WARRANTY - What is in the box: one USB audio sound adapter. Backed by a 1-year limited warranty, extended to 2 years when you register within 90 days on the manufacturer's website.
Rank #2
Focusrite Scarlett Solo 4th Gen USB-C Audio Interface
- The new generation of the songwriter's interface: Plug in your mic and guitar and let Scarlett Solo 4th Gen bring big studio sound to wherever you make music
- Studio-quality sound: With a huge 120dB dynamic range, the newest generation of Scarlett uses the same converters as Focusrite’s flagship interfaces, found in the world's biggest studios
- Find your signature sound: Scarlett 4th Gen's improved Air mode lifts vocals and guitars to the front of the mix, adding musical presence and rich harmonic drive to your recordings
- All you need to record, mix and master your music: Includes industry-leading recording software and a full collection of record-making plugins
- Everything in the box: Includes Pro Tools Intro+, Ableton Live Lite, Cubase LE, and Hitmaker Expansion: a suite of essential effects, powerful software instruments, and easy-to-use mastering tools
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