优化一下

app/.gitignore

@@ -1 +1,11 @@
+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.idea
+.DS_Store
 /build
+/captures
+.externalNativeBuild
+.tags*

libusbcamera/src/main/java/com/serenegiant/usb/common/AbstractUVCCameraHandler.java

@@ -676,7 +676,7 @@ public abstract class AbstractUVCCameraHandler extends Handler {
             // 启动视频编码线程
             startVideoRecord();
             // 启动音频编码线程
-            if (!params.isVoiceClose()) {
+            if (params != null && !params.isVoiceClose()) {
                 startAudioRecord();
             }
             callOnStartRecording();