我在我的 Android 应用程序中创建了自己的 Activity 来录制视频,它似乎工作得很好:视频被保存到手机中的指定文件夹中,每当我在图库中查看它们时,它们的方向都是正确的,并且它们是甚至上传到亚马逊 s3 服务器也没有问题。

唯一的问题是当我从服务器查看视频时,它们没有根据我录制的位置正确旋转。

每当我录制视频时,我都会设置视频的方向提示,这样可以在我的设备上正确播放,但对上传的视频没有影响。

这是我用来录制视频的代码

private boolean prepareVideoRecorder() {
    // It is very important to unlock the camera before doing setCamera
    // or it will results in a black preview
    if (camera == null)
    {
        camera = getCameraInstance();
    }

    if (recorder == null){
        recorder = new MediaRecorder();
    }
    //Have to stop preview before starting to record
    camera.stopPreview();
    // Step 1: Unlock and set camera to MediaRecorder
    camera.unlock();
    recorder.setCamera(camera);

    // 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(getOutputMediaFile(MEDIA_TYPE_VIDEO).getAbsolutePath());

    // No limit. Don't forget to check the space on disk.
    recorder.setMaxDuration(50000);
    recorder.setVideoFrameRate(30);
    recorder.setVideoEncodingBitRate(3000000);
    recorder.setAudioEncodingBitRate(8000);

    // Step 5: Set the preview output
    recorder.setPreviewDisplay(cameraPreview.getHolder().getSurface());

    //Setting the camera's orientation
    int degree = 0;
    // do not rotate image, just put rotation info in
    switch (mOrientation) {
        case ORIENTATION_LANDSCAPE_INVERTED:
            degree = 180;
            break;
        case ORIENTATION_PORTRAIT_NORMAL:
            degree = 90;
            break;
        case ORIENTATION_LANDSCAPE_NORMAL:
            degree = 0;
            break;
        case ORIENTATION_PORTRAIT_INVERTED:
            degree = 270;
            break;
    }

    recorder.setOrientationHint(degree);

    // Step 6: Prepare configured MediaRecorder
    try {
        recorder.prepare();
    } catch (IllegalStateException e) {
        // This is thrown if the previous calls are not called with the
        // proper order
        e.printStackTrace();
        releaseMediaRecorder();
        return false;
    } catch (IOException e) {
        releaseMediaRecorder();
        e.printStackTrace();
        return false;
    }
    //Everything went successfully
    return true;
}

然后开始录制:
private void startRecording(){
    //TODO: Draw stuff to let user know when they are recording
    // initialize video camera
    if (prepareVideoRecorder()) {
        //Assuring the app doesn't go to sleep while recording
        timerView.setKeepScreenOn(true);

        //"Adding" timer whenever we start to record
        timerView.setVisibility(View.VISIBLE);

        // Camera is available and unlocked, MediaRecorder is prepared,
        // now you can start recording
        recorder.start();

        // inform the user that recording has started
        shutter.setBackgroundResource(R.drawable.custom_button_red);
        isRecording = true;

        //TODO:Testing timer stuff
        startTimer();
    } else {
        // prepare didn't work, release the camera
        releaseMediaRecorder();
        // inform user
    }
}

并用于上传:
@Override
    protected HttpEntity doInBackground(Object... params){
        DefaultHttpClient client = new DefaultHttpClient();
        String stepID = (String)params[0];
        filepath = (String)params[1];
        String auth_token = (String)params[2];
        String projectID = (String)params[3];

        String filename = Uri.parse(filepath).getLastPathSegment().toString();
        String videoType = filename.substring(filename.lastIndexOf("."), filename.length());

        String url = VIDEO_URL+"?auth_token=" + auth_token;

        HttpPost post = new HttpPost(url);
        HttpContext localContext = new BasicHttpContext();
        MultipartEntity imageMPentity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);

        try{

            imageMPentity.addPart("project_id", new StringBody(""+projectID));
            imageMPentity.addPart("step_id", new StringBody(stepID));
            imageMPentity.addPart("content_type", new StringBody("video/"+videoType));
            imageMPentity.addPart("filename", new StringBody(filename));
            imageMPentity.addPart("video_path", new FileBody(new File(filepath)));
            post.setEntity(imageMPentity);

        } catch(Exception e){
            Log.e(StepDisplay.class.getName(), e.getLocalizedMessage(), e);
        }
        HttpResponse response = null;

        try {
            response = client.execute(post, localContext);
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        HttpEntity result = null;

        if(response != null){
             result = response.getEntity();
        }
        return result;
    }

我想这样做的一种方法是在应用程序中手动旋转视频,但我听说它非常昂贵并且会大大降低应用程序的速度。我想知道是否有一种简单的方法可以将方向元数据发送到网站并处理旋转服务器端。

我正在使用带有carrierwave gem的ruby on rails网站上传视频。我想知道是否有一种简单的方法或某种类型的信息可以传递给上传,以便让它识别视频已旋转。因为我可以从视频中提取此信息,并在我从手机发送时简单地将其 bundle 在 MultipartEntity 中发送。

最佳答案

如果您使用的是 Ruby on Rails 网站,则可以使用 FFMPEG 将视频转换为正确的方向。
您需要在您的服务器上安装 FFMPEG。安装因操作系统而异,但非常简单。

以下是根据发送到服务器的方向转换所有视频的方法。只需为旋转 90 、 180 、 270 、 360 设置条件并运行命令。
如果你没有得到你发送的方向,你可以使用 MiniExif 工具来获取方向
ffmpeg -i in.mov -vf "transpose=1" out.mov

0 = 90CounterCLockwise and Vertical Flip (default)
1 = 90Clockwise
2 = 90CounterClockwise
3 = 90Clockwise and Vertical Flip

10-07 19:14
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