根据使用的相机使用mp4parser旋转视频

Question

基本上我想旋转视频,取决于使用哪个相机拍摄它.

前置摄像头镜像为90度,后置摄像头显示正常.目前它将根据第一个剪辑设置Matrix.如果第一个剪辑是使用前置摄像头制作的,它会将所有剪辑旋转到270度,反之亦然.

这是一个示例代码(rotations是一个包含剪辑旋转的ArrayList):

for (TrackBox trackBox : trackBoxes) {
       Log.d("TRACKBOX", String.valueOf(rotations.get(i)));
       //trackBox.getTrackHeaderBox().setMatrix(Matrix.ROTATE_90);
       if (rotations.get(i) == 90) { //if clip was made with back camera
              trackBox.getTrackHeaderBox().setMatrix(Matrix.ROTATE_90);
              Log.d("Rotating to:", "90 degrees");

       } else if (rotations.get(i) == 270) { // if clip was made with front camera
              trackBox.getTrackHeaderBox().setMatrix(Matrix.ROTATE_270);
              Log.d("Rotating to:", "270 degrees");
       }
       m.addTrack(new Mp4TrackImpl(trackBox));

}
inMovies[i] = m;

Answer 1

实际上，你可以用这些代码旋转视频，不需要使用 mp4 解析器库，那么复杂。

/**
 *
 * @param mMediaRecorder
 * @return
 */
public static MediaRecorder rotateBackVideo(MediaRecorder mMediaRecorder) {
    /**
     * Define Orientation of video in here,
     * if in portrait mode, use value = 90,
     * if in landscape mode, use value = 0
     */
    switch (CustomCamera.current_orientation) {
        case 0:
            mMediaRecorder.setOrientationHint(90);
            break;
        case 90:
            mMediaRecorder.setOrientationHint(180);
            break;
        case 180:
            mMediaRecorder.setOrientationHint(270);
            break;
        case 270:
            mMediaRecorder.setOrientationHint(0);
            break;
    }

    return mMediaRecorder;
}

/**
 *
 * @param mMediaRecorder
 * @return
 */
public static MediaRecorder rotateFrontVideo(MediaRecorder mMediaRecorder) {
    /**
     * Define Orientation of video in here,
     * if in portrait mode, use value = 90,
     * if in landscape mode, use value = 0
     */
    switch (CustomCamera.current_orientation) {
        case 0:
            mMediaRecorder.setOrientationHint(270);
            break;
        case 90:
            mMediaRecorder.setOrientationHint(180);
            break;
        case 180:
            mMediaRecorder.setOrientationHint(90);
            break;
        case 270:
            mMediaRecorder.setOrientationHint(0);
            break;
    }

    return mMediaRecorder;
}