How to share your screen with audio
Enable screen audio in FastLive, then confirm the sound option in your browser’s sharing picker. For a web video, try sharing its tab in Chrome or Edge first. Window and full-screen audio depend on the system. Your microphone and the sound from the shared source are separate controls.
Identify the sound you want to send
A video's soundtrack, a game's audio and your voice are different sources. The microphone captures your voice and surroundings. Screen audio, when available, comes from the shared source. Turning on the microphone does not digitally capture a game's sound, even when your computer is playing that sound through nearby speakers.
Choose the intended source before adjusting volumes in FastLive. A capture can contain a perfectly good picture without an audio track. Requested capture audio depends on support and availability for the selected surface. Check both the site's setting and your choice in the browser dialog rather than assuming one switch controls the entire process. MDN: getDisplayMedia
Compare a tab, a window and the entire screen
A tab isolates one page and is usually a sensible first test for web video. A window shows a particular application, but does not guarantee that its sound accompanies the image. An entire screen lets you present several programs while increasing the chance of exposing notifications and personal content. Choose the smallest scope that meets your need.
When a picker offers system audio, that may include other applications, including a call open on the same computer. Sending it back to the group can produce repeated voices or echo. Chrome's documentation distinguishes tab audio from system audio; they should not be treated as interchangeable ways to capture the same thing. Chrome: screen sharing controls
Step by step in Chrome
- Open the video in a separate tab and confirm it plays normally. Avoid sharing the room's own page.
- Open FastLive Settings, choose Screen and leave screen audio switched on for this test.
- Select Start streaming. In the browser picker, choose the tab category and select the tab containing your video.
- Enable the share-audio option provided by the browser before confirming the capture source.
- Invite one viewer, play a short section and ask for confirmation. If they see video without sound, check their player volume too.
Labels can change between Chrome versions and interface languages. If a window source has no sound option, do not assume FastLive is hiding it elsewhere. Return to the picker and try a tab when the content allows that. For a native game, compare the options actually available on your own operating system.
Try the same workflow in Microsoft Edge
On desktop Edge, open the content, enable audio in FastLive and choose the capture source through the browser. For web content, begin with a tab and confirm the share-sound option when offered. Test with another person afterward. Hearing the source locally does not prove that an audio track was included in the outgoing stream.
For windows or an entire display, avoid expecting one universal behavior across all systems. Browser version, operating system and device policies affect the available choices. A managed work computer may restrict capture. Record what your picker actually offers before comparing it with instructions written for another machine or assuming the site is malfunctioning.
What about Firefox?
In the compatibility documentation checked on October 7, 2026, getDisplayMedia audio capture is not available in Firefox. That is different from microphone use or watching a stream with sound. To send audio from a browser tab, try a compatible desktop version of Chrome or Edge. MDN: browser compatibility data
Mozilla tracks screen-sharing audio implementation separately. Check its current status before treating the limitation as permanent. You do not need to change advanced browser preferences or install random extensions to determine whether a different supported browser and source combination meets your needs. Keep the test simple and repeatable. Mozilla: screen-sharing audio
Work through a missing-audio checklist
Start with the source player: is it playing and unmuted? Then check the viewer: is volume enabled, and have they tapped any prompt required to allow sound? Next review screen audio in FastLive and the option selected in the browser picker. A switch enabled on the website does not replace permission for the capture itself.
If the result stays silent, change the source and repeat a short sample. For echo, use headphones and temporarily mute the microphone. If the conversation is returning to everyone, system audio may be capturing the call along with the content. Prefer the content tab when it meets the task without including unrelated sounds.
Before a long session, confirm the result with somebody on another device. Testing only two tabs on one computer can confuse locally played audio with received audio. Write down the browser, operating system and source type. These details make a support request much more useful than reporting only that the sound did not work.
Frequently asked questions
Does sharing an entire screen always send every sound?
No. It depends on the browser, system and selected source. Check the sharing picker and confirm with a viewer; a captured picture does not prove audio was included.
Can the microphone replace screen audio?
No. It captures voice and surrounding sound. Picking up speakers through a microphone can create echo and lower quality instead of sending the application’s original audio.
Can I watch a stream with sound in Firefox?
The limitation discussed here concerns sending audio captured from a screen. It does not mean Firefox cannot play audio received in a compatible stream.