If you ever hear yourself speaking a few hundred milliseconds after you have spoken, most likely it's because the remote peer does not have Acoustic Echo Cancellation (AEC). The remote peer is playing your audio stream through the speakers, then picking it up with the microphone and streaming it back to you. Acoustic Echo Cancellation (AEC) is a method designed to remove echoes, reverberation, and unwanted added sounds from a signal that passes through an acoustic space.
AVR stands for Adaptive Video Resolution. With AVR, the resolution of the sender's video is changed according to the recipients' constraints. For more information, see Perform Adaptive Video Resolution.
Application is the application you create in the LiveSwitch Console. Each Application you create has its own configuration entities and an ID.
App is the application you create using the LiveSwitch SDK. You can create multiple apps using the same Application ID that you created in the LiveSwitch Console.
Bundling minimizes resource usage during connection setup, and during the call itself, because it uses a single socket to transmit data payloads rather than using one socket per stream. Specifically, core transports do not need to open sockets, forward additional ICE candidates to peers, conduct additional ICE connectivity checks, and conduct an additional DTLS (encryption) handshake.
A device is the hardware that the user uses to join your app, such as a laptop or a cell phone.
A client is an instance of your app. If the same app runs on different devices, a new client is created every time the app restarts.
H.264 is a digital video compression standard that uses half the space of MPEG-2 (the DVD standard) to deliver the same quality video.
Interactive Connectivity Establishment (ICE) is a technique used in computer networking to find ways for two computers to talk to each other as directly as possible in peer-to-peer networking. It is a standard method of NAT traversal used in WebRTC.
ICE collects all available candidates (local IP addresses, reflexive addresses-STUN ones and relayed addresses-TURN ones). All the collected addresses are then sent to the remote peer via SDP.
Once the WebRTC Client has all the collected ICE addresses of itself and its peer, it starts initiating connectivity checks. These checks essentially try sending media over the various addresses until success.
To stream media in a video conference, you need to produce audio and video. The audio and video produced and sent by the current user are called local media.
The Matroska Container is a file format that can hold an unlimited number of video, audio, picture, or subtitle tracks in one file. It is a universal format for storing common multimedia content. Matroska is similar in concept to other containers like AVI, MP4, or Advanced Systems Format (ASF), but is entirely open in specification, with implementations consisting mostly of open-source software. Matroska file extensions are
.mkv for video and
.mka for audio-only files.
Opus is an audio codec. Opus is unmatched for interactive speech and music transmission over the Internet but is also intended for storage and streaming applications.
Opus can handle a wide range of audio applications, including Voice over IP, videoconferencing, in-game chat, and even remote live music performances. It can scale from low bitrate narrowband speech to very high-quality stereo music.
In a video conference, the audio and video produced and sent by other participants is called remote media.
The tail length of an AEC is the length of time over which it can cancel echoes.
Transport Layer Security (TLS), the successor of the now-deprecated Secure Sockets Layer (SSL), is a cryptographic protocol designed to provide communications security over a computer network. TLS 1.2 is more secure than the previous cryptographic protocols such as SSL 2.0, SSL 3.0, TLS 1.0, and TLS 1.1. Essentially, TLS 1.2 keeps data being transferred across the network more secure.
A user is associated with a given person by their identity.
VP8 is a video compression format that supports progressive scan video signals with 4:2:0 chroma subsampling and 8 bits per sample.
VP9 is a video coding format that is a successor to VP8. VP9 is customized for video resolutions greater than 1080p (such as UHD) and also enables lossless compression.