[2.1.0] SurfaceView content size not fill

I've tried vlc 2.1.0 and there's a issue with SurfaceView. When I stream video with MJPEG url, the SurfaceView' content was scaled down (not scaled to fill its specific size). This issue did not occur when streaming with MP4 url.

However, when I use version 2.0.6, the SurfaceView's issue is gone.

What's wrong with MJPEG in version 2.1.0?