What is ScalabilityMode ?
I asked to a Big teacher who is well known chatGPT and he/she said
Me
What is ScarabilityMode in WebRTC ?
ChatGPT
It seems there might be a typo in your question. If you are referring to "Scalability Mode" in the context of WebRTC (Web Real-Time Communication), it relates to how video streams are structured and transmitted to accommodate different network conditions and device capabilities. Specifically, Scalability Mode is often associated with the VP9 video codec, which is commonly used in WebRTC for video compression.
VP9 supports a feature called "Scalability Modes" that provides different layers of video quality, allowing the sender to transmit a base layer and additional enhancement layers. This feature is particularly useful in scenarios where the network conditions vary, and the receiving device may adjust the video quality dynamically.
There are two primary Scalability Modes in VP9:
Spatial Scalability: In spatial scalability, the video is encoded at different resolutions. The base layer typically contains a lower-resolution version of the video, and enhancement layers contain additional details. This allows a receiver to choose which resolution to decode based on its available bandwidth or screen size.
Temporal Scalability: Temporal scalability involves encoding the video at different frame rates. The base layer contains a lower frame rate, and enhancement layers provide additional frames. This allows the receiver to adjust the frame rate based on network conditions or device capabilities.
The use of Scalability Modes is particularly beneficial in scenarios where bandwidth fluctuates, and the application wants to adapt to varying network conditions without requiring frequent renegotiation of the WebRTC session.
It's worth noting that the actual implementation and support for Scalability Modes depend on the specific WebRTC library or application you are using, as well as the capabilities of the underlying browsers. VP9 Scalability Modes may not be supported in all browsers or may require specific configurations. Always refer to the documentation of the WebRTC library or the specific implementation you are working with for the most accurate and up-to-date information.
Mainly uses by VP9.
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