[mythtv-users] HD Compression Artifacts
Michael T. Dean
mtdean at thirdcontact.com
Fri Mar 23 02:19:18 UTC 2007
On 03/22/2007 07:50 PM, John Goerzen wrote:
> I have a pcHDTV 3000 and am using it for over-the-air HD broadcasts.
> I have noticed recently that during NCAA games, where there is on-screen
> action -- even some sort of graphic moving around -- that classic MPEG
> compression artifacts are visible around it on the TV. I have no
> explanation for this. It seems like with HD, we shouldn't have to deal
> with that sort of thing, yet there it is.
> Switching between ffmpeg and libmpeg2 decoders makes no difference.
> Is this an inherent problem with HD? Or perhaps something specific to
> how CBS is airing the NCAA games?
I don't think what you're seeing are MPEG compression artifacts. I
think it's called "profit maximization." It seems many networks are
using too-low bitrates (= less bandwidth) for the shows they broadcast
so they can "steal" a bit for those "extra" channels (i.e. 2_1 uses a
bit less bandwidth to make room for 2_2 and so on...).
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