vMix integration
Copy the event-specific Closed Captions URL from 4ALL and add it to vMix as a Web Browser Input at the same dimensions as the production canvas. The 4ALL full-view background is transparent by default, and vMix preserves browser alpha when the input is used as an overlay, so no color key is normally required. If a downstream workflow requires chroma keying, enable 4ALL’s custom view background; it starts at green (#00ff00) and can be changed. Once vMix composites the browser input, the result is a visible open-caption overlay—not selectable CEA-608/708 caption data.
Published by The 4ALL CompanyLast reviewed
What it is
The vMix workflow uses the same event-specific browser output that 4ALL provides for production compositors. Caption language, line behavior, placement, text styling, and the optional caption bar are configured in 4ALL; vMix renders the page and places it over the program. Rehearse the exact input, language, overlay channel, resolution, and recovery path before the live event.
Capabilities and outputs
The exact configuration depends on the event, audience destination, enabled features, and downstream production equipment.
| Capability | What it means in production |
|---|---|
| Native transparency | Keep the 4ALL full-view background disabled to render the caption page with a transparent canvas that vMix can preserve as alpha. |
| Optional chroma background | Enable a custom full-view background when a keying workflow requires it; 4ALL starts with green (#00ff00) and allows another solid color. |
| Caption styling | Configure language, final and partial text, line count, maximum characters, position, width, padding, and an optional background bar in 4ALL. |
| vMix overlay control | Place the Web Browser Input over the program with a vMix Overlay channel and use Position controls only when production framing needs adjustment. |
| Language-specific outputs | Use the event and language URL intended for the program, with a separate preflighted input for each simultaneous language output. |
Production workflow
Enable the event’s Closed Captions output, select the production language, configure text and placement, and leave the full-view background transparent unless keying is required.
Use the event’s Share or Outputs control to copy the Closed Captions URL—not the attendee viewer, dashboard, or an authenticated setup page.
Choose Add Input, select Web Browser, paste the URL, and set the input dimensions to match the production canvas, such as 1920×1080 or 3840×2160.
Activate the desired Overlay channel, confirm alpha or the optional color key, and test short, long, partial, final, translated, and cleared captions in the final program output.
Practice refreshing or recreating the browser input, confirm the event-specific URL remains accessible, and monitor the composed output throughout the show.
Questions buyers and producers ask
No. The 4ALL full-view canvas is transparent by default, and vMix supports alpha in Web Browser Inputs used as overlays. Enable the optional green background only when the production or a downstream device specifically requires chroma keying.
Copy the event’s Closed Captions URL, choose Add Input in vMix, select Web Browser, paste the URL, match the input dimensions to the production canvas, and activate an Overlay channel.
Yes. Matching the browser input to the production canvas—for example 1920×1080 for 1080p or 3840×2160 for UHD—reduces unnecessary scaling and makes 4ALL placement settings more predictable.
Yes, when that language is enabled for the event. Copy and preflight the URL for the intended output language; use a separate input for each simultaneous language composition.
No. Once vMix composites the browser input, the text is a visible open-caption graphic. Use 4ALL Encoder when a supported H.264 workflow must carry embedded CEA-608/708 caption data.
Confirm the event is producing text, the correct language URL is loaded, the browser input is online and visible, an Overlay channel is active, dimensions match the canvas, and vMix Position or crop settings are not hiding the caption area. Refresh the Web Browser Input after major styling changes.
Keep exploring
Broadcast captions
Move 4ALL live captions into Ross XPression graphics, browser-source overlays, or CEA-608/708-capable H.264 contribution streams.
Read the answerLive captioning
Create real-time captions for conferences, festivals, sports, broadcasts, and hybrid events, delivered to browsers, displays, graphics, and video streams.
Read the answerOBS integration
Add 4ALL live captions to OBS with a configured browser source, then test crop, transparency, styling, timing, and recovery in the final scene.
Read the answerEmbedded captions
Insert 4ALL live captions as CEA-608/708 data in a supported H.264 Encoder output and verify the service on a downstream decoder.
Read the answerStart with a free workspace or talk with 4ALL about capacity, outputs, integrations, and production support.