So for awhile now I have been able to play Blu-ray discs without any issue. So I thought I would never have issue. 8GB RAM 8800GT 512MB 2.6Ghz Quad Core Windows 7 I have a 1080p DTS x264 video file in the m2ts container. This was originally in the MKV container. My issue was choppiness, at least that is the easiest way to describe it. I remuxed it into m2ts and got better playback. I normally run in Media Player Classic, but tried VLC and found better playback even more, but still choppy at more exciting scenes in the movie. What is causing this to happen. If I can run a blu-ray disc movie from the disc without issue, I should have no issue with this correct? The only thing I can think of is the videocard, but there is still no reason for it. Now I have tested 2 video files, both originally in the MKV container, both DTS x264 1080p, but i believe one was 12Mbps and one is 14Mbps. The one I am having issues with is of course the 14Mbps. Now I thought Mbps was a internet connection, I should not have issue playing it on the computer?? Anyways, I am just chatting away now. Ideas, suggestions.... Thanks.