Error处理： android.media.MediaRecorder.start(Native Method) 报错：start failed: -19

Error处理： android.media.MediaRecorder.start(Native Method) 报错：start failed: -19

spydroid-android测试在android4.0系统上报错

start failed: -19

而且也发现， 在使用MediaRecorder进行视频录制，调用start()方法时报错，发生spydroid-android测试在android4.0系统上同样的错误，具体错误如下：

01-06 14:04:07.790: V/MediaRecorder(13280): prepare
01-06 14:04:07.790: V/IMediaRecorder(13280): prepare
01-06 14:04:07.800: V/MediaRecorder(13280): start
01-06 14:04:07.800: V/IMediaRecorder(13280): start
01-06 14:04:08.190: E/MediaRecorder(13280): start failed: -19
01-06 14:04:08.190: W/System.err(13280): java.lang.RuntimeException: start failed.
01-06 14:04:08.200: W/System.err(13280): 	at android.media.MediaRecorder.start(Native Method)
01-06 14:04:08.200: W/System.err(13280): 	at com.yousee.videocapturedemo.VideoCapturePlus$2.onClick(VideoCapturePlus.java:145)
01-06 14:04:08.200: W/System.err(13280): 	at android.view.View.performClick(View.java:3515)
01-06 14:04:08.200: W/System.err(13280): 	at android.view.View$PerformClick.run(View.java:14144)
01-06 14:04:08.200: W/System.err(13280): 	at android.os.Handler.handleCallback(Handler.java:605)
01-06 14:04:08.200: W/System.err(13280): 	at android.os.Handler.dispatchMessage(Handler.java:92)
01-06 14:04:08.200: W/System.err(13280): 	at android.os.Looper.loop(Looper.java:148)
01-06 14:04:08.200: W/System.err(13280): 	at android.app.ActivityThread.main(ActivityThread.java:4503)
01-06 14:04:08.200: W/System.err(13280): 	at java.lang.reflect.Method.invokeNative(Native Method)
01-06 14:04:08.200: W/System.err(13280): 	at java.lang.reflect.Method.invoke(Method.java:511)
01-06 14:04:08.200: W/System.err(13280): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:830)
01-06 14:04:08.200: W/System.err(13280): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
01-06 14:04:08.200: W/System.err(13280): 	at dalvik.system.NativeStart.main(Native Method)

MediaRecorder 初始化和设置代码如下：

    .....
        mMediaRecorder=new MediaRecorder();  
        //设置视频源  
        mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);  
        //设置音频源  
        mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);  
        //设置文件输出格式  
        mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);  
        //设置视频编码方式  
        mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);  
        //设置音频编码方式  
        mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);  
        //设置视频高和宽,注意文档的说明:  
        //Must be called after setVideoSource().  
        //Call this after setOutFormat() but before prepare().  
        //设置录制的视频帧率,注意文档的说明:  
        //Must be called after setVideoSource().  
        //Call this after setOutFormat() but before prepare().  
        mMediaRecorder.setVideoFrameRate(20);  
        //设置预览画面  
        mMediaRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());  
        //设置输出路径  
        mMediaRecorder.setOutputFile  
        (Environment.getExternalStorageDirectory()+File.separator+System.currentTimeMillis()+".mp4");  
	.....
	mediaRecorder.prepare();
	mediaRecorder.start();
	.....

相同的程序在Android2.3平台上正常运行，在Android4.0上报错。

解决方法：

注释掉设置视频帧率的语句。//mMediaRecorder.setVideoFrameRate(mQuality.framerate);

将setVideoFrameRate去掉之后，如果还出现该错误，可将

mMediaRecorder.setVideoSize(videoWidth, videoHeight);也注释掉

原因：

      视频的帧率和视频大小是需要硬件支持的，如果设置的帧率和视频大小,如果硬件不支持就会出现错误。

参考：

          http://stackoverflow.com/questions/11249642/mediarecorder-start-failed-19