[mythtv-users] HD Compression Artifacts

Brad Staton brad.staton at gmail.com
Fri Mar 23 17:20:27 UTC 2007

On 3/23/07, John Goerzen <jgoerzen at complete.org> wrote:
> 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
Did your local CBS affiliate add extra digital sub-channels so that it could
simulcast multiple NCAA tournament games?  Mine did (2 new subchannels on
top of the 24/7 weather sub-channel), and the bandwidth needed to support
the extra subchannels means that they have to further compress the main (HD)
channel to fit it all in.  As the tournment progresses, there are fewer
simultaneous games and the extra sub-channels should disappear, freeing up
bandwidth for the main channel again.  By the time we get to the final game,
you should expect a similar level of compression that you see for other live

--Brad Staton
Brad.Staton at gmail.com
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