I never mentioned having anything extraordinary in this
setup!
Nope.
Im now attributed
sky
digital I don't even have!
So how did you remove the adverts from
Sky
One which you mentioned in a previous post?
Those are all things ken has thrown
in.
Nope.
I understand that the feed into my pc is not straight
from
the back of the camera the taking pictures.
Thats obvious. I never stated any different.
Nope. But the inference in achieving a
lossless picture is that from the point where it enters your home to the
display is that the entire process causes no atrefacting
or loss due to conversion.
All I said is that once I have the signal inside the PC
compression is lossless.
Nope, it’s not. As I said any
manipulation of the file will introduce atrefacting
or manipulation of what the software doing the job considers to
be superfluous just as a DVD player does or an STB
does.
I don't pretend to defy the laws of a/d d/a conversion.
I
took that as read.
Nope, you can’t, and this
introduces
noise to the picture and can remove much of the
detail.
If you look back at my original post, I also capture
from
the s-vhs deck which has no digital artifacts as its
not digital.
It will have artefacts, the question
is are they noticeable enough for you to see them?
Admittedly
D-VHS is far superior, superior even to DVD for image quality and the
allowable
file size, therefore the less compression needed and the higher the image
quality, S-VHS is only one small step away from VHS, 525 line
as opposed to 480 line resolution IIRC.
TiVo’s capture is as good as S-VHS IMO on the higher quality setting,
perhaps
slightly better, but can in now way, shape or form be
considered lossless.
Again I'll attempt to clarify the value of lossless
compression.
Hmmm, I still maintain that such a
thing
does not exist.
Mpeg is based on the same concept as
jpeg.
Okay, we’ll go with
that.
If you take a jpeg and uncompress it and compress it
again
and uncompress it.
You have more noise than the original. You even probably
have more noise than the 1st jpeg.
Yes, but the compression also removes
certain elements of the original and this has been the whole basis of the
argument over whether analogue or digital is better for audio for many a
long
year.
Once it reaches where I can control it, I don't
immediately
add noise by capturing in a compressed format.
Yes, you do, whether you see it or
not.
I edit, crop, and titles, effects all losslessly.
Please,
this is common practice!
To edit or crop *is* causing
loss!
The Last stage is mpeg2 compression. Sometimes I keep
the
lossless compressed material as well, which is big but thats
life.
MPEG2 is a compression standard that
cuts
out certain elements in order to achieve a smaller file size, hence not a
lossless standard. Think on it this way, is an MP3 encoded @ 96Kbs the same
as
an MP3 encoded @ 128Kbs, short answer is no, it’s not. Video is no
different to that, the higher the bitrate, the
better
the quality and by recording to MPEG2 you are cutting the bitrate
of the incoming transmission therefore compressing and losing some of the
original image.
Now, surely this is clear now
guys.
As mud!
K.