[mythtv-users] Blu-Ray/HD-DVD versus MythTV HD recordings

[Larry Sanderson]

> >> Add to that the MPEG transport used by the networks and you have MPEG
> >> artifacts that any discriminating viewer will see, most often in
> >> unpredictable motion like sports.
> >
> > What do you mean by that? As long as there no uncorrectable errors,
> > the
> > MPEG transport should not affect image quality, no?
>
> No.
>
> I'm not sure where to even start on that one, as ANY compression
> scheme will degrade the original video, by definition. Even the best
> DVDs are full of mpeg artifacts if you know what to look for.
>
> You can reduce the problems, but not eliminate them. I suppose if all
> you were to transmit were complete I-frames then you would have no
> artifacts, but also no compression.

I'm still learning here, but I assumed that all compression happened at MPEG 
encoding time.  I'm surprised to find that the transport layer adds 
additional compression.  Or am I misunderstanding this conversation?