If sound is missing from YouTube on your Mac mini after a macOS update, first work out whether you cannot hear playback or whether viewers cannot hear your broadcast. Those are separate problems: check the player and Mac output for playback, but check the encoder’s audio path for a silent broadcast.
The timing of an update is useful context, not proof that it caused the fault. Follow the path that matches what you can observe, and change one thing at a time so you can tell which test mattered.
First decide: is playback silent, or is the broadcast silent?
Ask two questions before changing settings: can you hear other audio on the Mac, and can a viewer hear the live stream? If you are watching someone else’s YouTube video or live stream, you are troubleshooting playback. If you are sending a live stream to your own channel, you are troubleshooting the outgoing broadcast. A muted player can affect what you hear without making your own broadcast silent; a missing encoder source can silence the broadcast while Mac speakers still work.
For playback, open a second app or website and listen on the same output device. Then try another YouTube video. If the second app works but YouTube does not, begin with the YouTube player and browser. If nothing on the Mac makes sound, go to the macOS output checks below.
For a broadcast, listen to the Mac locally and inspect the encoder’s audio meter, preview or recording. If local sound is present but the encoder meter does not respond to the intended source, the issue is likely somewhere before the stream reaches viewers: source selection, capture permissions, routing or the mixer. If the encoder has audio but the audience-facing stream is silent, check the outgoing stream and its audio track rather than turning up the Mac’s speakers.
Write down what works before proceeding: for example, “music plays in another app, YouTube is silent” or “the Mac plays sound, OBS meter stays flat”. That simple distinction prevents you from repeatedly changing system output when the missing sound is only in OBS, or rebuilding an encoder scene when the actual issue is a muted browser tab.
Check the YouTube player and device volume
On a YouTube video, check that the player is not muted and raise its volume slider. The browser can also be muted at the operating-system or browser level, so check the browser’s own controls if available. Then check the Mac’s output volume and mute state. These are distinct controls: increasing the YouTube slider cannot produce sound if macOS is sending audio to a different device or the system output is muted.
If your Mac is connected to headphones, USB speakers, an audio interface or a display, the selected output may not be the built-in speakers. Open Apple menu > System Settings > Sound > Output and select the device you intend to use. Confirm that output volume is raised and mute is off, then retry the video. Apple’s guide to changing sound output settings explains that the Mac can send sound to available devices such as speakers, headphones and connected displays.
A practical check is to select one destination at a time. If you want to listen through the Mac mini’s built-in speaker, select it where available; if you want sound from a monitor, choose that display’s audio output. Do not assume the physical connection determines the active output. Disconnect headphones or external speakers temporarily if the selected route keeps changing, then select the intended device again.
For HDMI display audio, select the HDMI-connected device in Sound > Output and check that the display itself is able to play sound. Apple’s Mac mini HDMI audio guidance also advises disconnecting devices from the computer’s headphone jack while troubleshooting HDMI sound. Treat a cable as a later possibility, not the first diagnosis: first confirm the output selection and connections. Replace or test a cable only if those checks point to the connection.
Compare another video or app
A comparison narrows the fault without requiring you to reset audio settings. Play a different YouTube video, then try audio in another app or on another website. Keep the same output device selected so the test is meaningful. If other apps work and multiple YouTube videos are silent, focus on YouTube or the browser. If all sources are silent, move to macOS output and connected-device checks.
You can also compare destinations. Play the same audio once through the Mac’s intended output and, if available, once through headphones or another known working device. If one destination works and another does not, the problem is more likely to involve the selected output or that device than the YouTube player. Make only one change between tests and note the result; switching browser, output device and video together makes it difficult to identify the failing stage.
For a creator, use a similar comparison but include the broadcast path. Confirm the source video or music can be heard locally. In OBS, check whether the relevant audio meter moves when that source plays; if the stream has already been sent, listen to the audience-facing result as well. A local recording can help separate a capture or mixer issue from a later streaming issue. YouTube’s live-stream troubleshooting guide recommends checking the encoder’s routed audio and video sources and reviewing the encoder output.
This same distinction matters if you run a continuous radio or devotional channel. A playback check on your own computer does not establish that viewers receive audio, and a viewer’s muted player does not establish that your broadcast is silent. When you are planning a pre-recorded schedule, a guide to using a YouTube scheduled livestream for an always-on radio station can help keep the publishing workflow separate from this audio diagnosis.
Try another browser and check extensions
If other apps have sound but YouTube remains silent, try the same video in a different browser. This is a diagnostic comparison, not a permanent recommendation to switch browsers. If sound works there, return to the first browser and check whether the tab or site is muted, then disable extensions that can affect media playback, audio or page behaviour. Test again after changing one item at a time.
A private or clean browser window can also help identify whether an extension or stored site setting is involved, provided that window does not carry the same extensions or settings. If the video plays with sound in a clean session, re-enable extensions gradually and check the result. Avoid clearing all browser data as the first step; it can sign you out of sites without addressing a system-wide output selection.
Restart the browser after checking its controls and extensions. YouTube’s official no-sound guidance also points users towards checking browser or device volume and sound settings, then restarting the browser or device if needed. A restart is a sensible test after basic checks, but it should not replace identifying whether the failure is browser playback, macOS output or a broadcast encoder.
If other apps have no sound
When sound is missing everywhere, return to System Settings > Sound > Output. Select the intended output device, raise its volume and confirm mute is off. The Mac may be routing sound to a device that is connected but not where you are listening: headphones, an audio interface, USB speakers, AirPlay or a monitor can all change the destination. Apple’s instructions for resolving sound problems on Mac recommend checking the selected output, its volume and connections.
Temporarily disconnect external audio devices and displays, then test the built-in speakers if available. If sound returns, reconnect devices one at a time and check which connection changes the available output or redirects sound. This is more informative than unplugging everything permanently, particularly if you rely on a monitor or interface for everyday work.
For HDMI, verify that the display appears as an output and that the monitor or television is configured to play sound. If it does not appear, check the physical connection before assuming the display or Mac is faulty. A Mac mini can send audio through HDMI, but the right output still has to be selected. The available device list and controls can differ with the connected equipment, so use what appears in your own Sound settings rather than following a menu for a different setup.
If the built-in speakers remain silent after checking output selection and disconnecting accessories, Apple advises that service may be needed. That applies to persistent device audio trouble; it does not diagnose a YouTube player or OBS issue. If the Mac’s speakers work but one external output does not, continue testing that route and device rather than treating it as a general Mac audio failure.
If OBS broadcast audio is missing
First confirm that local playback works. Then inspect OBS: is the intended audio source present, is it unmuted, and does its meter move when the audio plays? A healthy Mac output does not guarantee that OBS has captured the same sound. Conversely, a silent OBS meter points to capture or source routing before you need to investigate what YouTube is receiving.
Check the stream using more than one view when possible: the OBS preview or meters, a local recording, and the audience-facing YouTube stream. A recording with sound but a silent live result suggests you should inspect the outgoing stream settings or the selected audio track. A recording and stream that are both silent suggest the source is missing or muted earlier in the chain. Review encoder warnings or errors as YouTube recommends, and make sure the source that should carry audio is routed into the output you are sending.
OBS’s available macOS capture method depends on the versions installed. The OBS Project’s macOS desktop audio capture guide says OBS Studio 30 and later on macOS 13 (Ventura) and later can use a macOS Audio Capture Source for desktop audio or an individual application. For OBS 28 or 29 on macOS 13 and later, the guide describes Screen Capture Source; its audio is removed if that source is hidden. Check your macOS and OBS versions before following either branch, rather than adding an older third-party virtual audio device by default.
If the correct source is selected but its meter does not respond, test a simple source and recording before altering the whole scene. If the source meter responds but the local recording is silent, inspect the recording’s audio-track selection and OBS output settings. If the recording has sound but YouTube does not, verify which track is sent to the stream and listen to the live result after making a single change. Keep a known-good scene or note of the existing settings before edits, so you can reverse a change that makes the path harder to diagnose.
For an always-on channel, the repeated job is to keep the programme source and its audio attached to the outgoing broadcast, not merely to make the Mac’s speakers audible. If a file-based channel’s recurring problem is that a local computer must stay on to keep the broadcast running, StreamNeo removes that specific machine-running burden by taking an uploaded video and running it as a YouTube live stream with the computer switched off. It does not change the need to verify that the chosen file and channel are ready, and it is YouTube-only. For other OBS workflow questions, see this guide to OBS media sources for an always-on YouTube stream.
Keep the diagnosis tied to evidence
An update may coincide with a change in sound, but that timing alone does not show that macOS caused it. The checks above locate the problem by comparing the player, browser, system output, physical destination, encoder and audience-facing stream. If a setting changed during an update, restoring the intended device or capture source may resolve the symptom, but do not assume that explanation until the test supports it.
Keep a brief record of the configuration that works: output device, browser, OBS and macOS versions, capture source, and whether a local recording includes sound. This is especially useful when a channel is operated by more than one person or when you revisit it after a break. If you need to explain the issue to Apple or another support contact, those observations are more useful than saying only that “YouTube has no audio”.
For channels built around recorded programmes, sound format is a separate matter from whether the audio reaches the live stream. If you are diagnosing podcast-file playback or compatibility rather than a missing capture source, this article on streaming podcast episodes to YouTube Live in AAC format covers that adjacent workflow. It is not a substitute for checking the OBS meter and recording when the symptom is silence.
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FAQ
Why did my Mac mini lose YouTube sound after a macOS update?
The timing does not establish the cause. Check whether other apps have sound, then test the YouTube player, browser and selected macOS output separately. The result tells you which path to investigate next.
Why can I hear the video but viewers cannot hear my live stream?
Your Mac’s playback and the outgoing broadcast use different audio paths. Check whether the intended source appears and moves in OBS, then compare a local recording with the audience-facing stream and verify the audio track sent to YouTube.
Why is there no sound from my Mac mini monitor over HDMI?
Select the HDMI-connected output in System Settings > Sound > Output and confirm the display itself can play audio. Temporarily disconnect devices in the headphone jack while testing, as Apple recommends for Mac mini HDMI audio troubleshooting.
Do I need a virtual audio device for OBS on a Mac?
Not necessarily. OBS documents native capture options for OBS Studio 30 and later on macOS 13 and later, and a different Screen Capture Source route for OBS 28 or 29 on macOS 13 and later. Check your installed versions and the current OBS guide before adding another audio device.