Compression Setting When Ripping: Less=Better?

I've been ripping all my DVDs to a Windows Home Server box via
DvdShrink: just "Main Movie" on most.

On GPs, I've been selecting "no compression" since the resulting
..ISOs will never get burned - only viewed and I've got the space.

But I don't have any data to base that decision on. In fact,
I've got to wonder if I'm even perceptive enough to spot a diff.

Has anybody actually compared the perceived audio/video quality
of a DVD with, say, 20% compression vs no compression at all?
--
PeteCresswell

"(PeteCresswell)" <x@y.Invalid> wrote in message
news:fsris4le79nu2f5btr3b8f9fnns5qgi8v5@4ax.com...
> I've been ripping all my DVDs to a Windows Home Server box via
> DvdShrink: just "Main Movie" on most.
>
> On GPs, I've been selecting "no compression" since the resulting
> .ISOs will never get burned - only viewed and I've got the space.
>
> But I don't have any data to base that decision on. In fact,
> I've got to wonder if I'm even perceptive enough to spot a diff.
>
> Has anybody actually compared the perceived audio/video quality
> of a DVD with, say, 20% compression vs no compression at all?
> --
> PeteCresswell


This can be a very subjective thing. The technical comparisions,
that quantify a level of difference, do not always make for a
percieved difference and/or for any specified amount of difference.

Then there is no way to predict exactually when the algorithms
used in DVDShrink adjust the various parameters (in other words,
going from 10% to 11% may have no effect in some cases, but
maybe crosses a threshold point, in another case).

Individual preceptions are such that, some difference that drives
one person nuts, won't even be noticed by a different person.

What I guess I'm trying to say is that only you, and those you
are adapting the video for, can establish when the compression
has caused a problem, for your viewing enjoyment. For most
"normal" people you can apply quite a bit of compression to
good quality source video, and have no distracting effects.

Luck;
Ken

"Ken Maltby" <kmaltby@sbcglobal.net> wrote in message
news:NqednSn9Bc6p4VTUnZ2dnUVZ_jaWnZ2d@giganews.com ...
>
> "(PeteCresswell)" <x@y.Invalid> wrote in message
> news:fsris4le79nu2f5btr3b8f9fnns5qgi8v5@4ax.com...
>> I've been ripping all my DVDs to a Windows Home Server box via
>> DvdShrink: just "Main Movie" on most.
>>
>> On GPs, I've been selecting "no compression" since the resulting
>> .ISOs will never get burned - only viewed and I've got the space.
>>
>> But I don't have any data to base that decision on. In fact,
>> I've got to wonder if I'm even perceptive enough to spot a diff.
>>
>> Has anybody actually compared the perceived audio/video quality
>> of a DVD with, say, 20% compression vs no compression at all?
>> --
>> PeteCresswell
>
>
> This can be a very subjective thing. The technical comparisions,
> that quantify a level of difference, do not always make for a
> percieved difference and/or for any specified amount of difference.
>
> Then there is no way to predict exactually when the algorithms
> used in DVDShrink adjust the various parameters (in other words,
> going from 10% to 11% may have no effect in some cases, but
> maybe crosses a threshold point, in another case).
>
> Individual preceptions are such that, some difference that drives
> one person nuts, won't even be noticed by a different person.
>
> What I guess I'm trying to say is that only you, and those you
> are adapting the video for, can establish when the compression
> has caused a problem, for your viewing enjoyment. For most
> "normal" people you can apply quite a bit of compression to
> good quality source video, and have no distracting effects.
>
> Luck;
> Ken
>
The latest DVDShrink 3.2? allows you to set different parameters as to
quality of final output.

There is NO best setting.

You have to choose between resolution, that means how much fine details get
lost from the original.

Or you may see more garbage on the outlines of fast moving or changing
images.

Watch the original once or twice and make test copies with short sections
that may be critical. You will soon see the effect different settings have
on the outcome.

Good luck.

Max.