[mythtv-users] HD Compression Artifacts

Steven Adeff adeffs.mythtv at gmail.com
Fri Mar 23 19:29:41 UTC 2007

On 3/23/07, John Goerzen <jgoerzen at complete.org> wrote:
> On Fri, Mar 23, 2007 at 08:46:23AM -0400, ryan patterson wrote:
> > >Is this an inherent problem with HD?  Or perhaps something specific to
> > >how CBS is airing the NCAA games?
> >
> > You are seeing compression artifacts from the original broadcast source.
> > There is nothing wrong with your setup.  The problem is the hardware CBS
> > uses for compressing the video stream in real time for live viewing.
> > Prerecorded shows are compressed beforehand using a more time intensive
> > compression system.  As time goes by hardware for real time mpeg-2
> > compression should get more powerful.  So ten years from now these
> > compression artifacts on live events should be gone.
> Well, I am glad to know that I am not alone in this, and it sounds like
> it would be doing the same even if MythTV wasn't in the picture.
> This is the first I've really noticed it, though.  I haven't watched
> much basketball in HD, but the live football I've watched doesn't seem to
> have had the problem.  And prerecorded shows usually look great.
> But for something this important to CBS -- the NCAA tournament -- I'd
> have expected them to do something better, if in fact this is a result
> of them using cheap equipment or encoders.
> -- John

oddly, I noticed that CBS's 1080i feed of the NFL looked much better
in this regard than FOX's 720p feed, even with the idiotic choice by
CBS to use overlays that thoroughly screw with mpeg encoding...

Now if ESPNHD would just pull their heads out of their donkeys and
switch to 1080i...

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