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| Qwerk NP-g10 (qwerk@no.mail) |
2005/10/30 11:46 |
Hello uw,
you wrote:
"Hi Qwerk
I seldom post messages to the groups, so let me start by saying
how much I
have appreciated your sharing of, what is to me, some rare and
classic
videos. The format that you choose to post them in is of
secondary
importance to me, considering even getting the chance to see
them at all is
more than I would otherwise have had. I do have broadband
though, so I can
certainly sympathize with those still struggling on dialup to
download
large video files. They shouldn't despair though, as the more
people who
download your video now, the greater the chance that it will be
reposted
again in the future, perhaps at a time when those on dialup have
moved to
broadband themselves, or else when a more efficient video codec
has come
along, enabling the video to be re-encoded to a smaller file
size and
reposted.
>Hello, let me explain. My Adrian version is on a DVD as .vob-
>file. I've converted it to a .avi-file because the quality is
>better than converted to an .mpg-file. I would avoid a big
>loss of quality.
Just curious, Qwerk, but how do you convert the VOB file to an
avi usually?
I know from my own experiences that this process can be a bit of
hit and
miss at times with all the software and guides that are out
there.
Just for your info (in a take it or leave it kinda way :-), I
checked
Frankie(a).avi and can see that it was encoded with DivX 5.03 @
720 x 576
and a video bitrate of 3942 kbps. That video bitrate does seem
fairly high
for a DivX encoded file, in fact it's closer to a bitrate that
you would
normally find in an MPEG2 video file. Typically, about half that
rate is
the absolute most that you would need for hi-quality DivX. I've
seen some
people encode video sourced from a DVD down to between 700 and
800kbps,
just so they can fit it on one CD, but I think you can start to
notice the
drop in quality by that stage. You're right in that re-encoding
a DVD as
MPEG1/2 at a lower bitrate probably would see a noticeable
reduction in
quality, and posting the original MPEG2 video from the DVD would
likely be
a much larger file. Do you know what the original bitrate of the
MPEG2
video inside the VOB was?
>If I would have a program to split .vob-files I would have
>done it, but I never have found a such programm as freeware.
Split as in demux the video and audio out into separate files? I
think
ifoedit does that. I know that it muxes MPEG2 video and audio
together and
authors VOBs at any rate because I use it to do just that. VOBs
are just
container files, much like (the now ancient) avi files are. You
can
probably find info about other free tools (PgcDemux, ReJig,
VobEdit) that
do demuxing of VOB files here: http://www.videohelp.com/tools?s=
111#111
For easy re-encoding, I've just started using the latest version
of AutoGK
to re-encode MPEG2 video that I've captured via digital TV, and
I must say
that I've been very impressed with the results so far. 2.5GB
compressed
down to 350MB without any noticeable loss in quality, and
believe me I'm a
quality freak too.
AutoGK basically simplifies the whole process of converting from
an MPEG2
source to DivX (or Xvid), and you don't need to worry about
demuxing as it
does that automatically as well. You select your video source
(which can be
a standard mpeg2 program stream file, an .ifo and its
accompanying vob's
from a dvd, or even a .ts mpeg2 transport stream), then the
desired audio
stream if the source file has more than one present, your
desired target
size for the avi file (in either number of CDs, megabytes or
even just a
desired quality level) and AutoGK will go off and automatically
do all the
interaction with other well known freeware tools (which are
included in the
AutoGK distribution such as virtualdub, besweet etc) to scan the
video and
make all the appropriate settings (you can force it to use
particular
settings too) for the encoder so that at the end of the process
you will
get the best quality possible in the size that you're after.
It's by no
means the only tool that does this, but if you're after a
simple, *free*,
no fuss frontend to video conversion, then it's certainly worth
a try.
I know you didn't solicit any help, so you can tell me to mind
my own
business if you like, but you seem like a very easy going sort
of a guy, so
I don't think this message will trouble you. If you're having
fun doing
what you're doing, then that's the important thing. No
complaints on this
end. ;-) Please feel free to ping me in this group if you have
any
questions that you think I might be able to help you with, or I
may be able
to arrange an email addy to give you if you would prefer that.
All the best,
uw"
First thank you for your efforts and sorry for my late answer.
But better late than never.
I've converted Adrian with DVDx 2.3 using the DivX 5.03 codec.
I've made many trials an figured out the best possible quality
as you can see. The problem was, that the original .mpeg2 part
was over 1 GBytes.
You spoke about Frankie. There is high level of noice in it and
the noice has been increased when I had tried a lower rate of
Byte per second. And when I've reduced to 360 x 288 than were
big green stripes in the vid. I don't know how the vid was
recorded from tape to DVD. There must be done a mistake but to
late - we must live with that.
I'm not a specialist and I've done what I could do for the best
quality.
You can be sure I've made a lot of trials and have spent much
time to get the best results.
Regards Qwerk NP-g10
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