8

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: start failed: -19错误。我已经检查了这个和这个说要删除mediaRecorder.setVideoSize(sView.getWidth(), sView.getHeight());但我没有使用的链接setVideoSize(sView.getWidth(), sView.getHeight())。通过尝试和错误，我发现如果我删除编码器recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);并且 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。任何帮助都将不胜感激。提前致谢。

4

2 回答 2

2

问题是您没有设置相机，使用Camera 1 API您应该首先打开相机，然后将其解锁并将其设置到录像机。只有在那之后，您才能继续配置MediaRecorder（顺便说一句，这是一段写得很漂亮的 API）

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();
}
于 2018-03-28T15:24:01.060 回答
0 
  boolean mStartRecording=false;

首先在活动中创建这个变量，然后尝试下面的代码

if( recorder == null ) {
        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());
    }
    if(!mStartRecording) {
        try {
            recorder.prepare();
            recorder.start();
            mStartRecording = true;
        }  catch (IOException e) {
            e.printStackTrace();
        }
    } else {
        mStartRecording = false;
        recorder.stop();
        recorder.reset();
        recorder.release();
        recorder = null;
    }

试试这个，让我知道它是否有效。

于 2018-03-29T09:33:37.873 回答