“开始失败：
我试图在Android上创建一个录像机，并且我已经准备好了应该工作的代码 - 但是我经常收到错误消息， start failed: -19 。
这是我的代码：
public boolean startRecording() {
try {
camera.unlock();
mediaRecorder = new MediaRecorder();
mediaRecorder.setOnErrorListener(new MediaRecorder.OnErrorListener() {
@Override
public void onError(MediaRecorder mr, int what, int extra) {
Log.i(TAG, "Error");
}
});
mediaRecorder.setCamera(camera);
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
Log.i(TAG, "a");
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H263);
Log.i(TAG, "b");
mediaRecorder.setMaxDuration(maxDurationInMs); // set to 20000
String uniqueOutFile = OUTPUT_FILE + System.currentTimeMillis() + ".3gp";
File outFile = new File(uniqueOutFile);
if (outFile.exists()) {
outFile.delete();
}
mediaRecorder.setOutputFile(uniqueOutFile);
mediaRecorder.setVideoFrameRate(videoFramesPerSecond); // set to 20
mediaRecorder.setVideoSize(sView.getWidth(), sView.getHeight());
Log.i(TAG, "c");
mediaRecorder.setPreviewDisplay(holder.getSurface());
mediaRecorder.setMaxFileSize(maxFileSizeInBytes); // set to 50000
mediaRecorder.prepare();
Log.i(TAG, "d");
mediaRecorder.start();
Log.i(TAG, "e");
return true;
} catch (IllegalStateException e) {
Log.i(TAG, "f");
Log.e(TAG, e.getMessage());
e.printStackTrace();
camera.lock();
return false;
} catch (IOException e) {
Log.i(TAG, "g");
Log.e(TAG, e.getMessage());
e.printStackTrace();
camera.lock();
return false;
} catch (RuntimeException e) {
Log.i(TAG, "h");
Log.e(TAG, e.getMessage());
camera.lock();
return false;
}
}
所有调试日志（从“a”到“d”）都以日志形式打印，因此，似乎mediaRecorder.prepare()所有步骤都已正确完成。 然后它捕获一个带有消息start failed: -19的RuntimeException start failed: -19 。 还有一个类似的问题，但这并不能解决我的问题。
是否有任何其他原因得到这样的错误？
刚刚发现了这个错误，在这一行中：
mediaRecorder.setVideoSize(sView.getWidth(), sView.getHeight());
在注释掉这一行后，代码完美运行！
一旦我添加了这个视频记录，我解决了我的问题
/**
* Start video recording by cleaning the old camera preview
*/
private void startVideoRecorder() {
// THIS IS NEEDED BECAUSE THE GLASS CURRENTLY THROWS AN ERROR OF
// "MediaRecorder start failed: -19"
// THIS WONT BE NEEDED INCASE OF PHONE AND TABLET
// This causes crash in glass kitkat version so remove it
// try {
// mCamera.setPreviewDisplay(null);
// } catch (java.io.IOException ioe) {
// Log.d(TAG,
// "IOException nullifying preview display: "
// + ioe.getMessage());
// }
// mCamera.stopPreview();
// mCamera.unlock();
recorder = new MediaRecorder();
// Let's initRecorder so we can record again
initRecorder();
}
/**
* Initialize video recorder to record video
*/
private void initRecorder() {
try {
File dir = new File(folderPath);
if (!dir.exists()) {
dir.mkdirs();
}
mCamera.stopPreview();
mCamera.unlock();
videofile = new File(dir, fileName + ".mp4");
recorder.setCamera(mCamera);
// Step 2: Set sources
recorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
// Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
recorder.setProfile(CamcorderProfile
.get(CamcorderProfile.QUALITY_HIGH));
// Step 4: Set output file
recorder.setOutputFile(videofile.getAbsolutePath());
// Step 5: Set the preview output
recorder.setPreviewDisplay(mPreview.getHolder().getSurface());
// Step 6: Prepare configured MediaRecorder
recorder.setMaxDuration(video_duration * 1000);
recorder.setOnInfoListener(new OnInfoListener() {
@Override
public void onInfo(MediaRecorder mr, int what, int extra) {
if (what == MediaRecorder.MEDIA_RECORDER_INFO_MAX_DURATION_REACHED) {
mCamera.stopPreview();
releaseMediaRecorder();
/*
* initiate media scan and put the new things into the
* path array to make the scanner aware of the location
* and the files you want to see
*/MediaScannerConnection.scanFile(
CuxtomCamActivity.this,
new String[] { videofile.getPath() }, null,
null);
Intent intent = new Intent();
intent.putExtra(CuxtomIntent.FILE_PATH,
videofile.getPath());
intent.putExtra(CuxtomIntent.FILE_TYPE, FILE_TYPE.VIDEO);
setResult(RESULT_OK, intent);
finish();
}
}
});
recorder.prepare();
recorder.start();
} catch (Exception e) {
Log.e("Error Stating CuXtom Camera", e.getMessage());
}
}
private void releaseMediaRecorder() {
if (recorder != null) {
recorder.reset(); // clear recorder configuration
recorder.release(); // release the recorder object
recorder = null;
}
}
有关详细指南，请参阅此开源Cuxtom Cam
问题出在setVideoSize()代码中。
为什么这个代码错误...
根据我所做的研究，如果MediaRecorder#setVideoSize()设置的视频大小有问题，则会显示错误代码-19。
运行此代码，并查看设备中相机支持的屏幕：
final List<Camera.Size> mSupportedVideoSizes = getSupportedVideoSizes(mCamera);
for (Camera.Size str : mSupportedVideoSizes)
Log.e(TAG, "mSupportedVideoSizes "+str.width + ":" + str.height + " ... "
+ ((float) str.width / str.height));
方法是：
public List<Size> getSupportedVideoSizes(Camera camera) {
if (camera.getParameters().getSupportedVideoSizes() != null) {
return camera.getParameters().getSupportedVideoSizes();
} else {
// Video sizes may be null, which indicates that all the supported
// preview sizes are supported for video recording.
return camera.getParameters().getSupportedPreviewSizes();
}
}
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