Thanks for your reply. I was using VLC 2.2.0 to play a 3840*2160 mp4: - Start vlc in command line: vlc --avcodec-hw=any, the video is choppy - Start vlc in command line: vlc --avcodec-hw=dxva2, the video looks good - In nVLC example, calling libvlc_new with/without "--avcodec-hw=xxx" makes...