@brief If send performance fallback is not turned on, this value represents the recommended video input frame rate in fps;
If send performance fallback is turned on, this value represents the maximum frame rate of the current push stream in fps.
@brief If send performance fallback is not turned on, this value represents the recommended video input height;
If send performance fallback is turned on, this value represents the maximum height of the current push stream.
@brief If send performance fallback is not turned on, this value represents the recommended video input width;
If send performance fallback is turned on, this value represents the maximum width of the current push stream.