设置MediaRecorder时为什么显示错误IllegalStateException? [英] Why show error IllegalStateException when setting MediaRecorder?

问题描述

我的代码设置为MediaRecorder，它在行设置质量时显示错误

My code setting MediaRecorder, it show error at row set Quality

mMediaRecorder = new MediaRecorder();

   // Step 1: Unlock and set camera to MediaRecorder
   mCamera.stopPreview();
   mCamera.unlock();
  mMediaRecorder.setCamera(mCamera);

  mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
    mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
    mMediaRecorder.setProfile(CamcorderProfile .get(CamcorderProfile.QUALITY_HIGH));
    mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
    mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);

    // Step 4: Set output file
    mMediaRecorder.setOutputFile(getOutputMediaFile(MEDIA_TYPE_VIDEO).toString());

    // Step 5: Set the preview output
    mMediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface());

    // Step 6: Prepare configured MediaRecorder
   try {
    mMediaRecorder.prepare();
        Log.d("DEBUG", "IllegalStateException preparing MediaRecorder: "
                        + e.getMessage());
                releaseMediaRecorder();
                return false;
   } catch (IOException e) {
                Log.d("DEBUG",
                        "IOException preparing MediaRecorder: " + e.getMessage());
                releaseMediaRecorder();
                return false;
   }

例如:

java.lang.IllegalStateException

Stacktrace:

Stacktrace:

java.lang.IllegalStateException
    at android.media.MediaRecorder.setOutputFormat(Native Method)
    at android.media.MediaRecorder.setProfile(MediaRecorder.java:366)
    at jp.osaka.E028.prepareVideoRecorder(E028.java:1441)
    at jp.osaka.E028.access$16(E028.java:1403)
    at jp.osaka.E028$6.onClick(E028.java:344)
    at android.view.View.performClick(View.java:3517)
    at android.view.View$PerformClick.run(View.java:14155)
    at android.os.Handler.handleCallback(Handler.java:605)
    at android.os.Handler.dispatchMessage(Handler.java:92)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:4503)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:809)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:576)
    at dalvik.system.NativeStart.main(Native Method)

为什么在设置MediaRecorder时显示错误IllegalStateException?

Why show error IllegalStateException when setting MediaRecorder?

推荐答案

实际上，您执行两次mMediaRecorder.setOutputFormat():一次明确地执行一次，然后mMediaRecorder.setProfile()尝试再次执行该操作，如在堆栈跟踪中所见.

Actually you do mMediaRecorder.setOutputFormat() twice: One time explicitly and afterwards mMediaRecorder.setProfile() tries to do it again as you can see in your stacktrace.

Android Media Recorder对此类事情的鲁棒性很低.

The Android Media Recorder has a very low robustness for things like that.

因此，删除显示以下内容的行

So remove the line that says

mMediaRecorder.setOutputFormat();

，错误应消失.顺便说一句.删除

and the error should go away. And btw. remove

mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);

这也是mMediaRecorder.setProfile()已经完成的工作.

which is what mMediaRecorder.setProfile() has already done as well.

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