[Ilugc] [OT] Data backup on DVD
- From: girish1729@xxxxxxxxx (Girish Venkatachalam)
- Date: Fri Aug 18 13:34:58 2006
Please find comments inline.
4) If so what is the encryption used? Can I crack
them
to make them viewable on other countries?
If it is to remain playable on a retail DVD
player, it has to use
standard CSS encryption - and this easily handled by
libdvdcss
(which is usually used by Xine, Ogle, Mplayer, etc.)
However, region-coding is an entirely different
issue altogether -
this is drive- and player-specific. Not all drives
implement it in
the embedded SW for the drive controller - if it's
implemented
in the host-side device-driver, then it's not an
issue and all the
Linux DVD players simply ignore the region coding
information.
If it's implemented inside the drive, then you'll
have to look for
updated flashable firmware that removes region
coding - which
may or may not exist for the drive in question.
Most retail DVD players from China no longer
implement region
coding - i.e. they are region-free, so any DVD will
play on them.
I recommend a unit called 'Scorpio', which has
TOSlink optical
out, Dolby Digital 5.1 decoder with 6-channel preamp
outputs,
2-channel stereo power amp built-in (useful if you
just want a
tiny player that can be connected to a pair of
bookshelf speakers-
I use a pair of tiny JVCs, but anything will work,
including
homebuilt stuff), a DB-15 VGA output (great for
connecting
to monitors/panels/projectors!!), progressive scan,
and the capability
to play most MPEG4 files (YMMV, but it depends on
the codec(s)
that are used).
Cost of Scorpio? Where do you get it? Is that a DVD
player? Software ? What is it? Please pardon my
ignorance and be gentle. :-)
What is progressive and deinterlaced scanning?
Is MPEG4 better off than flash format? I doubt it. Is
it possible to build flash codec into the thing?
What is DB-15 output? I hear that LCD displays are
digital unlike CRT which uses analog technology. Is
there a straight digital interface that avoids the ADC
DAC convesion and consequent signal degradation and
power consumption?
Is there a move to replace the aging VGA interface?
Coming to audio, is it possible to get a cheap Dolby
or DTS experience at home? I hear there is some
politics and lack of standardisation there. Do you
know anythinga about it?
How to plan the acoustics? What should be the
placement angle of the speakers? What should be the
distance between them?
Can preamp stage be avoided? Does it introduce any
noise?
Is it possible to do some white noise filtering in
software using a free tool like audacity or something?
I have already had success with low pass filtering
with audacity. It works very well.
Can I have high fidelity audio reproduction with a
frequency response that is nearly 20-20k Hz? I am sure
it is not reqd but somewhat close would do.
Can we do AAC, AC3 and other stuff completely in
software itself?
What will be the cost of such a home theatre setup?
Thanks in advance Siva for bearing with me. Please
pardon if I have asked any stupid questions. :-)
I opened it up, and the electronics are great
except for lousy
electrolytic capacitors on the SMPS/audio board.
About an
hour of minor surgery ensued, and it now sports a
combination
of professional-grade Nippon Chemicon LXZ,
Matsushita FC/FK
and Nichicon P* capacitors - which should be good
for about
25 years of service.
How do I do this hardware hacking? What minor surgery
did you do? Why is the role of capacitors so pivotal?
In this digital world when PLLs can tune FM radio
without any RC circuit why are capacitors still
hurting us?
The durability and AV quality
are now
comparable to $2000+ DVD players. It's possible to
make it
comparable to $25000 professional DVD players with
further
surgery, but the point of dimishing returns has
already been
reached.
What do you mean by point of diminishing returns? I
don't get you. I think the bottom line is how much it
would cost.
And how to minimise the costs? There is certainly a
void in the market when it comes to a decent home
theatre product.
The Sony large screen television and expensive music
systems are all passe.
I think with a little ingenuity it will be possible
for us to make a world class homebrew home theatre.
How to go about it? Any advice?
Not too bad for a Rs.2500 player with about
Rs.50
worth of capacitor upgrades.
-Siva
P.S. If you plan to go this route and do the
capacitor upgrades,
stick with non-aqueous, low-ESR, 105c capacitors
from one
of the Japanese majors: Matsushita/Panasonic,
Nichicon,
Nippon Chemicon, Elna, Rubycon or Sanyo. Everything
else
is crap and will fail in a year or two. Avoid
Keltron or any of the
local/Korean/Chinese/Taiwanese brands like the
plague - ironically,
some of these are priced higher than their
technologically superior
Japanese counterparts.
My dear Siva,
What a genius! It is nothing short of it.
I really don't want to waste it away. Why don't you
put this up in some website or something?
I did read about the aging of capacitors in some
electronics book.
Looking forward to hearing from you soon. :-)
regards,
Girish
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