成员的完整列表，这些成员属于 com.hyphenate.chat.EMVideoCallHelper,包括所有继承而来的类成员

getLocalAudioBitrate()	com.hyphenate.chat.EMVideoCallHelper
getLocalBitrate()	com.hyphenate.chat.EMVideoCallHelper
getRemoteAudioBitrate()	com.hyphenate.chat.EMVideoCallHelper
getRemoteBitrate()	com.hyphenate.chat.EMVideoCallHelper
getVideoFrameRate()	com.hyphenate.chat.EMVideoCallHelper
getVideoHeight()	com.hyphenate.chat.EMVideoCallHelper
getVideoLatency()	com.hyphenate.chat.EMVideoCallHelper
getVideoLostRate()	com.hyphenate.chat.EMVideoCallHelper
getVideoWidth()	com.hyphenate.chat.EMVideoCallHelper
setPreferMovFormatEnable(boolean enabled)	com.hyphenate.chat.EMVideoCallHelper