Re: Editing MPEG-(?)
- From: "Ken Maltby" <kmaltby@xxxxxxxxxxxxx>
- Date: Sun, 23 Jul 2006 13:59:03 -0500
"webpa" <webpa@xxxxxxx> wrote in message
news:1153671039.295789.210630@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
couchpotatoe wrote:
webpa wrote:
. Unless you
wish to be permanently married to Sony hardware and software, stay
away, stay very far away.
I have been fixated on SONY as I knew that the most TRV models had
"pass through".
Many models from other manufacturers can also do pass-through, even
though the users' manuals are often very vague about it.
You seem a little confused about the nature of video signals and
computers.
A little confused is an understatment.
If you have transfered a video signal into a computer (call
"capturing"), it is digital, no matter whether the source was digital
or analog or morse code. If you have the appropriate software on that
computer, you can then manipulate the video (and audio) to your heart's
content, irrespective of its source or original format.
Are you saying that all MINI DV's apart from SONY produce *.AVI format?
Not exactly. The digital data format on all miniDV video cassettes is
identical for all manufacturers (in a given TV format...NTSC in the
US....PAL in most of Europe). When you connect the miniDV camcorder
(or deck) to a computer via a IEEE-1394 ("FireWire) etc) port, the
digital data that flows from the camcorder to the computer is identical
for all camcorder manufacturers and all computer types (Windows, Mac,
Unix). The software in the computer that controls the capture process
takes the digital data stream and formats it for storage in the
computer (hard disk, flash memory, etc). The vast, vast majority of the
miniDV capture software out there formats the video data stream as a
type of AVI ("audio-video interleaved") using a specific type of codec
(coder-decoder) called "dvsd". There are literally hundreds of AVI
codecs, the miniDV codec is simply one optimised for this task. It is
possible to transcode any video file (avi, mov, mpg, mv2, etc. etc)
into any other as long as you have software to do it. Video editing
software designed to work with miniDV encoded files can usually work
with many other "flavors" of avi and other formats as well. However,
mpeg-2 files (such as from DVD movies and "miniDVD" camcorders) are
substantially different from AVI files....so different in fact, that it
takes substantially different software techniques to edit them.
One other (confusiong factor): A video file identified as "mpeg" may be
mpeg-1 rather than mpeg-2. Mpeg-1 is as different from mpeg-2 as the
later is from avi. Before miniDV and DVD video, computer video capture
cards used mpeg-1 in several sometimes proprietary flavors to store
captured video...sometimes in mpeg1-encoded AVI files. Mpeg-1 is a
vastly less efficient way to compress and encode video than either
miniDV, mpeg-2, WMA, etc.
Good post, but the evolution of MPEG from MPEG1 to
MPEG2 while very significant is not one that created that
great a divide between them. Any MPEG2 encoder will
also be able to encode to MPEG1, the same for decoders.
Now a days it would be hard to find an MPEG1 only
device that wasn't Internet or surveillance related. All the
major PCI or USB2, Hardware MPEG capture cards/
boxes are able to provide "Main Profile" DVD compatible
MPEG2. With the increase in CPU power, real-time
software encoding has also made great strides.
Luck;
Ken
.
- References:
- Editing MPEG-(?)
- From: couchpotatoe
- Re: Editing MPEG-(?)
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