---
title: API de Captura de Transmissões de Multimédia (Media Streams)
slug: Web/API/API_transmissoes_multimedia
tags:
- API
- API de Transmissão de Multimédia
- Audio
- Avançado
- Guía
- Introdução
- Media
- Multimedia
- Video
translation_of: Web/API/Media_Streams_API
---
{{DefaultAPISidebar("Media Capture and Streams")}}
A API de Media Capture and Streams, muitas vezes chamada de Media Stream API ou Stream API, é uma API relacionada com WebRTC que suporta transmissões de dados de áudio ou vídeo, os métodos para trabalhar com eles, as restrições associadas com o tipo de dados, as devoluções de retorno de sucesso e erro quando utilizar os dados de forma assíncrona, e os eventos que foram ativados durante o processo.
Conceitos básicos
The API is based on the manipulation of a {{domxref("MediaStream")}} object representing a flux of audio- or video-related data. See an example in Get the video.
A MediaStream consists of zero or more {{domxref("MediaStreamTrack")}} objects, representing various audio or video tracks. Each MediaStreamTrack may have one or more channels. The channel represents the smallest unit of a media stream, such as an audio signal associated with a given speaker, like left or right in a stereo audio track.
MediaStream objects have a single input and a single output. A MediaStream object generated by {{domxref("MediaDevices.getUserMedia", "getUserMedia()")}} is called local, and has as its source input one of the user's cameras or microphones. A non-local MediaStream may be representing to a media element, like {{HTMLElement("video")}} or {{HTMLElement("audio")}}, a stream originating over the network, and obtained via the WebRTC {{domxref("RTCPeerConnection")}} API, or a stream created using the Web Audio API {{domxref("MediaStreamAudioSourceNode")}}. The output of the MediaStream object is linked to a consumer. It can be a media elements, like {{HTMLElement("audio")}} or {{HTMLElement("video")}}, the WebRTC {{domxref("RTCPeerConnection")}} API or a Web Audio API {{domxref("MediaStreamAudioDestinationNode")}}.
Referência
{{event("addtrack")}} (event)
{{domxref("AudioStreamTrack")}}
{{domxref("BlobEvent")}}
{{event("ended")}} (event)
{{domxref("MediaStream")}}
{{domxref("MediaStreamTrack")}}
{{domxref("MediaStreamTrackEvent")}}
{{domxref("MediaTrackCapabilities")}}
{{domxref("MediaTrackConstraints")}}
{{domxref("MediaTrackSettings")}}
{{domxref("MediaTrackSupportedConstraints")}}
{{event("muted")}} (event)
{{domxref("NavigatorUserMedia")}}
{{domxref("NavigatorUserMediaError")}}
{{event("overconstrained")}} (event)
{{event("removetrack")}} (event)
{{event("started")}} (event)
{{event("unmuted")}} (event)
{{domxref("URL")}}
{{domxref("VideoStreamTrack")}}
Guias e tutoriais
{{LandingPageListSubpages}}
Compatibilidade de navegador
{{ CompatibilityTable }}
Funcionalidade
Chrome
Firefox (Gecko)
Edge
Internet Explorer
Opera
Safari (WebKit)
Stream API
21{{ property_prefix("webkit") }}
Nightly 18{{ property_prefix("moz") }}
{{ CompatVersionUnknown }}
{{ CompatUnknown }}
12
{{ CompatUnknown }}
Funcionalidade
Android
Edge
Firefox Mobile (Gecko)
IE Phone
Opera Mobile
Safari Mobile
API de emissão
{{ CompatNo }}
{{CompatVersionUnknown}}
{{ CompatUnknown }}
{{ CompatUnknown }}
{{ CompatNo }}
{{ CompatNo }}
Currently using WebRTC for accessing the camera is supported in Chrome, Opera and Firefox Nightly 18. Enabling WebRTC in Firefox Nightly requires you to set a flag in the configuration:
Type "about:config" in the address bar and say yes that you want to make changes
Find the "media.navigator.enabled" entry and set it to true