android – MediaRecorder给出启动错误或IllegalStateException

我正在使用MediaRecorder通过 Android的Camera API录制视频.我遇到了一个非常奇怪的问题.

private void startRecordingVideo() {
    recorder = new MediaRecorder();
    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
    recorder.setoutputFormat(MediaRecorder.OutputFormat.MPEG_4);
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    recorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
    File file = getAlbumDir();
    recorder.setoutputFile(file.getAbsolutePath());
    recorder.setMaxDuration(50000);
    recorder.setMaxFileSize(5000000);
    recorder.setPreviewdisplay(CameraBridgeViewBase.surfaceHolder.getSurface());
    try {
        recorder.prepare();
        recorder.start();
    } catch (IllegalStateException | IOException e) {
        e.printstacktrace();
    }     
}

现在这给了我MediaRecorder：启动失败：-19错误.我检查了this和this链接,它们表示要删除mediaRecorder.setVideoSize(sView.getWidth(),sView.getHeight());但我没有使用setVideoSize(sView.getWidth(),sView.getHeight()).有了尝试和错误,我发现如果我删除编码器recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);和recorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);应用程序不会崩溃,但会给出新的异常：

03-23 16:50:06.213 28226-28226/com.scenera.android.surveillance E/MediaRecorder: audio source is set,but audio encoder is not set

我不明白我在这里做错了什么.任何帮助都会得到满足.提前致谢.

解决方法

问题是你没有设置相机,使用Camera 1 API,你应该先打开相机,然后将其解锁并将其设置到录像机.只有在那之后你才能继续配置MediaRecorder(这是一个非常漂亮的API写的)

MediaRecorder recorder = new MediaRecorder();

Camera camera = Camera.open();
camera.unlock();
recorder.setCamera(camera);
recorder.setPreviewdisplay(surfaceHolder.getSurface());

recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);

recorder.setoutputFormat(MediaRecorder.OutputFormat.MPEG_4);

recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);

File file = getAlbumDir();
recorder.setoutputFile(file.getAbsolutePath());

recorder.setMaxDuration(50000);
recorder.setMaxFileSize(5000000);
try {
    recorder.prepare();
    recorder.start();
} catch (IllegalStateException | IOException e) {
    e.printstacktrace();
}