calculateVideoSize From https://github.com/dmytrodanylyk/dmytrodanylyk/blob/gh-pages/articles/surface-view-video-cropping.md

MediaMeta.java

private void calculateVideoSize() {
    try {
        AssetFileDescriptor afd = getAssets().openFd(FILE_NAME);
        MediaMetadataRetriever metaRetriever = new MediaMetadataRetriever();
        metaRetriever.setDataSource(
                afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
        String height = metaRetriever
                .extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT);
        String width = metaRetriever
                .extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH);
        mVideoHeight = Float.parseFloat(height);
        mVideoWidth = Float.parseFloat(width);

    } catch (IOException e) {
        Log.d(TAG, e.getMessage());
    } catch (NumberFormatException e) {
        Log.d(TAG, e.getMessage());
    }
}