On 15 Apr, 13:49, wrote:
On Thu, 15 Apr 2010 13:41:15 +0100

"Recliner" wrote:
I simply don't see any on the BBC channels. I think you may have a
reception problem. Or could it be that you're watching on a flat screen

Nope , my recption is fine and even if it wasn't it wouldn't cause these
sorts of artifacts. Watch any any fast motion or any motion all over the
screen such as the surface of water and you'll see it. It even occurs on DVDs
occasionally though not to the same extent.

+1 for broadcast - even see this on BBC One on challenging shots.

I think if you see such faults on decent DVDs, you're probably using a
screen size + viewing distance that's unsuitable for SD viewing.
Depends whether it's interlaced or progressive content. Interlaced is
more challenging.

telly that isn't resizing the image properly? *[I'm still using
excellent CRT TV sets.]

Perhaps your CRT is smearing the image slightly so you don't see it.

To be fair, a very good CRT is applying a slight horizontal low pass
filter in terms of the Gaussian spot shape, but that's not bad thing.

All flat panels are also applying filtering during the upscaling (none
are native SD "PAL" resolution), plus deinterlacing, plus sharpening,
plus very strange processing of near-blacks on LCDs, etc etc, all of
which make encoding artefacts far more obvious than they are in the
source.

Plus flat panels are usually bigger, making it even more likely that
you're sitting too close (for a give screen size) for SD to look
acceptable.

Cheers,
David.