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Start the lecture and watch the OBS audio meter for the source that should capture its sound. If it does not move, OBS is not receiving audio from that source. If it moves, check monitoring, mute and fader settings, then compare a local recording with the YouTube stream to find where the sound disappears.
Trace the sound from playback to YouTube
Check each point in sequence rather than changing several settings at once. That makes it easier to identify the break in the audio path.
- Confirm the lecture is playing with sound. Check its own playback controls and the output device. A muted player or unexpected output device can leave the capture source with nothing to receive.
- Watch the relevant OBS meter. Start playback and look for movement on the meter belonging to the source expected to carry the lecture audio. OBS’s audio-meter technical guidance says the input indicator is the first place to check whether audio is reaching OBS; no indicator means no audio is reaching that OBS interface. OBS Audio Mixer Guide and Audio Mixer Technical Details.
- If the meter moves, listen through OBS monitoring. In the Audio Mixer, open Edit → Advanced Audio Properties for the source and check its monitoring selection. Listen through the configured monitoring device, and inspect mute, fader and filters. OBS explains source monitoring in its Audio Mixer Guide.
- Record a short local test. Play the lecture while making a short OBS recording, then listen to the recording. This checks whether sound is reaching the local output; OBS recommends recording and listening back before going live.
- Compare the recording with the live output. Check the sound directly in the encoder or YouTube live view. If the recording has sound but the live stream does not, the difference points toward live output, track selection or routing. That is a diagnostic inference, not a confirmed cause without inspecting your setup. YouTube also recommends checking encoder output and the local archive when troubleshooting stream sound: Troubleshoot your YouTube live stream.
A moving meter is useful, but it does not prove that viewers receive sound: mute, fader, routing or downstream encoder output can still interrupt it.
Use the test results to narrow the cause
| What you observe | What it suggests | Next check |
|---|---|---|
| The lecture plays, but the expected OBS meter does not move | The capture or input path is not reaching that OBS source. | Check playback output, the selected capture source or device, and whether that source type fits how the lecture is played. |
| 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 selection and the configured listening device. |
| OBS monitoring works, but the local recording is silent | The recording output or selected audio track may differ from the monitored source. | Inspect the recording configuration and which audio output or track it includes. |
| The local recording has sound, but the YouTube stream does not | Live output or stream routing may differ from the local capture. | Listen to the encoder’s live output and check 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 playback on another device or connection and check whether other viewers report the same issue. |
These are diagnostic interpretations, not confirmed causes. YouTube says a problem reported by one viewer may be with that viewer’s computer or connection; reports from viewers on different connections can point to an encoder issue. YouTube live stream troubleshooting.
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#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
Match the capture method to how the lecture plays
There is no single capture-device setting that fits every setup. The right instructions depend on your operating system and whether the lecture plays in a browser, an OBS media source or another application. OBS documents these as separate capture paths, including application audio capture, macOS desktop audio capture and media sources. Choose the guide that matches your platform and playback method rather than changing an unrelated device setting.
If the audio disappears intermittently
Note when the sound stops, then check whether the lecture playback is still active and whether the selected application or device changed at that time. A 24/7 schedule does not, by itself, establish a different first-line audio diagnosis; trace the same signal path when the fault occurs.
Rank #2
Sale
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
Or let it run in the cloud
If you want the YouTube stream to continue without leaving OBS or a computer running at home, StreamNeo is a cloud option for uploaded lecture recordings. Upload the recording or build a playlist, add your YouTube stream key once, and go live. StreamNeo loops the uploaded video from the cloud; it does not go live from a camera.
Quick Recap
Bestseller No. 1
Bestseller No. 4
Best Value
Sale
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
Sale
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.
- Nothing has to stay on at home; StreamNeo keeps the stream running from the cloud.
- One flat price per slot covers any quality up to 4K 60fps as uploaded, with no re-encode or quality tiers.
- Automatic recovery is included if YouTube drops the stream.
- The first day is free with no card required.
- Monthly: $9.99 per month.
See StreamNeo or start the free first day.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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