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# What is WebRTC? # FAQ
### What is WebRTC?
WebRTC is an open framework for the web that enables Real Time Communications WebRTC is an open framework for the web that enables Real Time Communications
in the browser. It includes the fundamental building blocks for high-quality in the browser. It includes the fundamental building blocks for high-quality
@ -12,7 +14,7 @@ The WebRTC effort is being standardized on an API level at the W3C and at the
protocol level at the IETF. protocol level at the IETF.
# Why should I use WebRTC? ### Why should I use WebRTC?
We think you'll want to build your next video-chat style application using We think you'll want to build your next video-chat style application using
WebRTC. Here's why: WebRTC. Here's why:
@ -35,7 +37,7 @@ WebRTC. Here's why:
scenario (for example, but not limited to, SIP, XMPP/Jingle, et al.). scenario (for example, but not limited to, SIP, XMPP/Jingle, et al.).
# What is the Opus audio codec? ### What is the Opus audio codec?
[Opus][opus-link] is a royalty-free audio codec defined by IETF [Opus][opus-link] is a royalty-free audio codec defined by IETF
RFC 6176. It supports constant and variable bitrate encoding from 6 kbit/s to RFC 6176. It supports constant and variable bitrate encoding from 6 kbit/s to
@ -45,7 +47,7 @@ entire hearing range of the human auditory system can be reproduced).
[opus-link]: http://opus-codec.org/ [opus-link]: http://opus-codec.org/
# What is the iSAC audio codec? ### What is the iSAC audio codec?
iSAC is a robust, bandwidth-adaptive, wideband and super-wideband voice codec iSAC is a robust, bandwidth-adaptive, wideband and super-wideband voice codec
developed by Global IP Solutions, and is used in many Voice over IP (VoIP) and developed by Global IP Solutions, and is used in many Voice over IP (VoIP) and
@ -54,7 +56,7 @@ millions of VoIP endpoints. This codec is included as part of the WebRTC
project. project.
# What is the iLBC audio codec? ### What is the iLBC audio codec?
iLBC is a free narrowband voice codec that was developed by Global IP iLBC is a free narrowband voice codec that was developed by Global IP
Solutions, and is used in many Voice over IP (VoIP) and streaming audio Solutions, and is used in many Voice over IP (VoIP) and streaming audio
@ -63,19 +65,19 @@ specification and the iLBC RTP Profile draft became available. This codec is
included as part of the WebRTC project. included as part of the WebRTC project.
# What is the VP8 video codec? ### What is the VP8 video codec?
VP8 is a highly-efficient video compression technology developed by the WebM Project. It is the video codec included with WebRTC. VP8 is a highly-efficient video compression technology developed by the WebM Project. It is the video codec included with WebRTC.
# What is the VP9 video codec? ### What is the VP9 video codec?
Similar to VP8, VP9 is also from the WebM Project. Its a next-generation open video codec. From Chrome 48 on desktop and Android, VP9 will be an optional video codec for video calls. More details in [Google Developers][vp9-link]. Similar to VP8, VP9 is also from the WebM Project. Its a next-generation open video codec. From Chrome 48 on desktop and Android, VP9 will be an optional video codec for video calls. More details in [Google Developers][vp9-link].
[vp9-link]: https://developers.google.com/web/updates/2016/01/vp9-webrtc/ [vp9-link]: https://developers.google.com/web/updates/2016/01/vp9-webrtc/
# What other components are included in the WebRTC package? ### What other components are included in the WebRTC package?
## Audio #### Audio
WebRTC offers a complete stack for voice communications. It includes not only WebRTC offers a complete stack for voice communications. It includes not only
the necessary codecs, but other components necessary to great user the necessary codecs, but other components necessary to great user
@ -84,7 +86,7 @@ automatic gain control (AGC), noise reduction, noise suppression, and
hardware access and control across multiple platforms. hardware access and control across multiple platforms.
## Video #### Video
The WebRTC project builds on the VP8 codec, introduced in 2010 as part of the The WebRTC project builds on the VP8 codec, introduced in 2010 as part of the
[WebM Project][webm-link]. It includes components to conceal [WebM Project][webm-link]. It includes components to conceal
@ -93,7 +95,7 @@ capabilities across multiple platforms.
[webm-link]: http://www.webmproject.org/ [webm-link]: http://www.webmproject.org/
## Network #### Network
Dynamic jitter buffers and error concealment techniques are included for audio Dynamic jitter buffers and error concealment techniques are included for audio
and video, which help mitigate the effects of packet loss and unreliable and video, which help mitigate the effects of packet loss and unreliable
@ -101,21 +103,21 @@ networks. Also included are components for establishing a peer-to-peer
connection using ICE / STUN / Turn / RTP-over-TCP and support for proxies. connection using ICE / STUN / Turn / RTP-over-TCP and support for proxies.
# How do I access the WebRTC code? ### How do I access the WebRTC code?
Go to [https://webrtc.googlesource.com/src][webrtc-repo-link] Go to [https://webrtc.googlesource.com/src][webrtc-repo-link].
[webrtc-repo-link]: https://webrtc.googlesource.com/src [webrtc-repo-link]: https://webrtc.googlesource.com/src
# How can I test the quality of WebRTC components? ### How can I test the quality of WebRTC components?
We have put sample applications [here][examples-link]. We have put sample applications [here][examples-link].
[examples-link]: https://webrtc.googlesource.com/src/+/refs/heads/master/docs/native-code/development/index.md#example-applications [examples-link]: https://webrtc.googlesource.com/src/+/refs/heads/master/docs/native-code/development/index.md#example-applications
# Are WebRTC components subject to change? ### Are WebRTC components subject to change?
WebRTC is based on a API that is still under development through efforts at WebRTC is based on a API that is still under development through efforts at
WHATWG, W3C and IETF. We hope to get to a stable API once a few browser WHATWG, W3C and IETF. We hope to get to a stable API once a few browser
@ -126,7 +128,7 @@ components under it may be modified to improve quality, performance and
feature set. feature set.
# WebRTC components are open-source. How do I get the source and contribute code? ### WebRTC components are open-source. How do I get the source and contribute code?
Please see [Getting Started][getting-started-link] and Please see [Getting Started][getting-started-link] and
[Contributing bug fixes][contributing-link] for more information. [Contributing bug fixes][contributing-link] for more information.
@ -135,7 +137,7 @@ Please see [Getting Started][getting-started-link] and
[contributing-link]: https://webrtc.org/support/contributing [contributing-link]: https://webrtc.org/support/contributing
# To be a Contributor, do I need to sign any agreements? ### To be a Contributor, do I need to sign any agreements?
Yes, each Contributor must sign and return the Yes, each Contributor must sign and return the
[Contributor License Agreement][cla-link] [Contributor License Agreement][cla-link]
@ -143,7 +145,7 @@ Yes, each Contributor must sign and return the
[cla-link]: https://developers.google.com/open-source/cla/individual?hl=en [cla-link]: https://developers.google.com/open-source/cla/individual?hl=en
# Do I have to be a programmer to use WebRTC? ### Do I have to be a programmer to use WebRTC?
Yes, to build WebRTC support into a software application or contribute Yes, to build WebRTC support into a software application or contribute
improvements, programming skills are required. However, usage of the improvements, programming skills are required. However, usage of the
@ -151,26 +153,26 @@ JavaScript APIs that call WebRTC in the browsers will only require typical web
development skills. development skills.
# Is the WebRTC project owned by Google or is it independent? ### Is the WebRTC project owned by Google or is it independent?
WebRTC is an open-source project supported by Google, Mozilla and Opera. The WebRTC is an open-source project supported by Google, Mozilla and Opera. The
API and underlying protocols are being developed jointly at the W3C and IETF. API and underlying protocols are being developed jointly at the W3C and IETF.
# Are the WebRTC components from Google's acquisition of Global IP Solutions? ### Are the WebRTC components from Google's acquisition of Global IP Solutions?
Yes. Some components, such as VoiceEngine, VideoEngine, NetEQ, AEC, et al. all Yes. Some components, such as VoiceEngine, VideoEngine, NetEQ, AEC, et al. all
stem from the GIPS acquisition. stem from the GIPS acquisition.
# What codecs are supported in WebRTC? ### What codecs are supported in WebRTC?
The currently supported voice codecs are G.711, G.722, iLBC, and iSAC, and VP8 The currently supported voice codecs are G.711, G.722, iLBC, and iSAC, and VP8
is the supported video codec. The list of supported codecs may change in the is the supported video codec. The list of supported codecs may change in the
future. future.
# Please explain how WebRTC is free of charge? ### Please explain how WebRTC is free of charge?
Some software frameworks, voice and video codecs require end-users, Some software frameworks, voice and video codecs require end-users,
distributors and manufacturers to pay patent royalties to use the intellectual distributors and manufacturers to pay patent royalties to use the intellectual
@ -182,14 +184,14 @@ page][license-link].
[license-link]: https://webrtc.googlesource.com/src/+/refs/heads/master/docs/license/index.md [license-link]: https://webrtc.googlesource.com/src/+/refs/heads/master/docs/license/index.md
# What does this license let me do? ### What does this license let me do?
Like most BSD licenses, this license allows you to use the WebRTC code with a Like most BSD licenses, this license allows you to use the WebRTC code with a
minimum of restrictions on your use. You can use the code in proprietary minimum of restrictions on your use. You can use the code in proprietary
software as well as open source software. software as well as open source software.
# Do I need to release the source if I make changes? ### Do I need to release the source if I make changes?
No, the license does not require you to release source if you make changes. No, the license does not require you to release source if you make changes.
However, we would love to see any changes you make and possibly incorporate However, we would love to see any changes you make and possibly incorporate
@ -199,7 +201,7 @@ them, so if you want to participate please visit the
[code-review-link]: https://webrtc-review.googlesource.com/ [code-review-link]: https://webrtc-review.googlesource.com/
# Why is there a separate patent grant? ### Why is there a separate patent grant?
In order to decouple patents from copyright, thus preserving the pure BSD In order to decouple patents from copyright, thus preserving the pure BSD
nature of the copyright license, the license and the patent grant are nature of the copyright license, the license and the patent grant are
@ -208,13 +210,13 @@ license, and the patent grant can exist on its own. This makes WebRTC
compatible with all major license scenarios. compatible with all major license scenarios.
# What if someone gets the code from Google and gives it to me without changes. Do I have a patent grant from Google? ### What if someone gets the code from Google and gives it to me without changes. Do I have a patent grant from Google?
Yes, you still have the right to redistribute and you still have a patent Yes, you still have the right to redistribute and you still have a patent
license for Google's patents that cover the code that Google released. license for Google's patents that cover the code that Google released.
# What if someone makes a change to the code and gives it to me. Do I have a patent license from Google for that change? ### What if someone makes a change to the code and gives it to me. Do I have a patent license from Google for that change?
You still have the right to redistribute but no patent license for the changes You still have the right to redistribute but no patent license for the changes
(if there are any patents covering it). We can't give patent licenses for (if there are any patents covering it). We can't give patent licenses for
@ -223,13 +225,13 @@ what those changes will be. Other common licenses take the same approach,
including the Apache license. including the Apache license.
# What if Google receives or buys a patent that covers the code I receive sometime after I receive the code. Do I have a patent grant for that patent? ### What if Google receives or buys a patent that covers the code I receive sometime after I receive the code. Do I have a patent grant for that patent?
Yes, you still have the right to redistribute and you still have a patent Yes, you still have the right to redistribute and you still have a patent
license for Google's patents that cover the code that Google released. license for Google's patents that cover the code that Google released.
# What if my competitor uses the code and brings patent litigation against me for something unrelated to the code. Does he or she still have a patent license? ### What if my competitor uses the code and brings patent litigation against me for something unrelated to the code. Does he or she still have a patent license?
Yes, he/she still has the right to redistribute and he/she still has a patent Yes, he/she still has the right to redistribute and he/she still has a patent
license for Google's patents that cover the code that Google released. license for Google's patents that cover the code that Google released.