Can not turn off audio

[kevin406972552]

If audio mode is false. fail log: E/AndroidRuntime(18814): FATAL EXCEPTION: Thread-1373 E/AndroidRuntime(18814): Process: com.example.camera_with_rtmp_demo, PID: 18814 E/AndroidRuntime(18814): java.lang.NullPointerException: Attempt to invoke virtual method 'void android.media.MediaCodec.start()' on a null object reference E/AndroidRuntime(18814): at com.pedro.encoder.BaseEncoder.initCodec(BaseEncoder.java:56) E/AndroidRuntime(18814): at com.pedro.encoder.BaseEncoder.start(BaseEncoder.java:44) E/AndroidRuntime(18814): at com.whelksoft.camera_with_rtmp.RtmpCameraConnector.startEncoders(RtmpCameraConnector.kt:243) E/AndroidRuntime(18814): at com.whelksoft.camera_with_rtmp.RtmpCameraConnector.onConnectionSuccessRtmp(RtmpCameraConnector.kt:492) E/AndroidRuntime(18814): at net.ossrs.rtmp.SrsFlvMuxer$2.run(SrsFlvMuxer.java:290) E/AndroidRuntime(18814): at java.lang.Thread.run(Thread.java:818)