* This method lets the recording engine join a channel, and start recording
*
* @param channelKey This parameter is optional if the user uses a static key, or App ID. In this case, pass NULL as the parameter value. More details refer to http://docs-origin.agora.io/en/user_guide/Component_and_Others/Dynamic_Key_User_Guide.html
* @param channelId A string providing the unique channel id for the AgoraRTC session
parser.add_long_opt("appliteDir",&applitePath,"directory of app lite 'video_recorder', Must pointer to 'Agora_Recording_SDK_for_Linux_FULL/bin/' folder/must",