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TompoeS
Guest
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 Posted:
Sat Feb 19, 2005 3:09 pm Post subject:
new videocompression techniques? |
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Does anyone know some more info about OBJECT-based VS. PIXEL-based video
compression?
How these two work?
Advantages/Disadvantages?
What is mostly used nowadays?
something else:
What is the "definition" of QUALITY ? I mean, which video-compression you
use for which purpose?
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Just Me
Guest
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| Posted:
Sat Feb 19, 2005 10:05 pm Post subject:
Re: new videocompression techniques? |
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After I bought a DVD burner, I was able to give up encoding and all of its
quality losses. Except I'm noticing that a Divx movie does not eat up much
hard disk space and is easy to fast forward and back. I guess that's the
pay back for quality loss. And if you've got videos on your hard drive, you
can access them much easier than fumbling around for a DVD disk to put in.
"TompoeS" <tompoes88-geen@spam-pandora.be> wrote in message
news:CfERd.15240$mG1.1244281@phobos.telenet-ops.be...
| Quote: | Does anyone know some more info about OBJECT-based VS. PIXEL-based video
compression?
How these two work?
Advantages/Disadvantages?
What is mostly used nowadays?
something else:
What is the "definition" of QUALITY ? I mean, which video-compression you
use for which purpose?
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| Back to top |
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deimos
Guest
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| Posted:
Sun Feb 20, 2005 1:39 pm Post subject:
Re: new videocompression techniques? |
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TompoeS wrote:
| Quote: | Does anyone know some more info about OBJECT-based VS. PIXEL-based video
compression?
How these two work?
Advantages/Disadvantages?
What is mostly used nowadays?
something else:
What is the "definition" of QUALITY ? I mean, which video-compression you
use for which purpose?
|
I think you're referring to regular DCT vs. Wavelet compression. But
what you should be interested in is the standardization of MPEG4. Up
until now, DIVX, XVID and related codecs have been based on what's
called "MPEG4-Part 1", a draft standardization of some parts of MPEG4.
But what will soon become the definitive standard used with HD, media
transmission, HD-DVD, consumer players, and portable devices is H.264/AVC.
It's far more suited towards streaming and web based video and consumer
video, while AVC is likely to become used widely in commercial and HD
products. AVC alpha tests have shown roughly 20-30% increase in
compression over MPEG4-Part1 codecs while maintaining better motion
resolution and image quality.
The biggest problem is that all current digital formats have sacrificed
temporal quality for still image quality. Macro-blocking is an obvious
side effect (aliasing you could call it), but it's especially prevalent
in highly compressed broadcast-MPEG video. Some broadcasters think
reducing D1 video down and compressing it to 6mbits is a good idea, but
motion quality is horrible. |
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TompoeS
Guest
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| Posted:
Sun Feb 20, 2005 7:54 pm Post subject:
Re: new videocompression techniques? |
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| Quote: | I think you're referring to regular DCT vs. Wavelet compression. But
what you should be interested in is the standardization of MPEG4. Up
until now, DIVX, XVID and related codecs have been based on what's called
"MPEG4-Part 1", a draft standardization of some parts of MPEG4. But what
will soon become the definitive standard used with HD, media transmission,
HD-DVD, consumer players, and portable devices is H.264/AVC.
It's far more suited towards streaming and web based video and consumer
video, while AVC is likely to become used widely in commercial and HD
products. AVC alpha tests have shown roughly 20-30% increase in
compression over MPEG4-Part1 codecs while maintaining better motion
resolution and image quality.
The biggest problem is that all current digital formats have sacrificed
temporal quality for still image quality. Macro-blocking is an obvious
side effect (aliasing you could call it), but it's especially prevalent in
highly compressed broadcast-MPEG video. Some broadcasters think reducing
D1 video down and compressing it to 6mbits is a good idea, but motion
quality is horrible.
|
tnx!
do you have url's of websites where i can find those "new technologies"?
you say the H.264 will become the standard of HD-products ... but isn't
H.263 allready used in other things like security camera's or so? ... or is
it only within HD security cam and not the bad quality cam's they use in
most of the little shops? |
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deimos
Guest
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| Posted:
Mon Feb 21, 2005 2:02 pm Post subject:
Re: new videocompression techniques? |
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TompoeS wrote:
| Quote: | I think you're referring to regular DCT vs. Wavelet compression. But
what you should be interested in is the standardization of MPEG4. Up
until now, DIVX, XVID and related codecs have been based on what's called
"MPEG4-Part 1", a draft standardization of some parts of MPEG4. But what
will soon become the definitive standard used with HD, media transmission,
HD-DVD, consumer players, and portable devices is H.264/AVC.
It's far more suited towards streaming and web based video and consumer
video, while AVC is likely to become used widely in commercial and HD
products. AVC alpha tests have shown roughly 20-30% increase in
compression over MPEG4-Part1 codecs while maintaining better motion
resolution and image quality.
The biggest problem is that all current digital formats have sacrificed
temporal quality for still image quality. Macro-blocking is an obvious
side effect (aliasing you could call it), but it's especially prevalent in
highly compressed broadcast-MPEG video. Some broadcasters think reducing
D1 video down and compressing it to 6mbits is a good idea, but motion
quality is horrible.
tnx!
do you have url's of websites where i can find those "new technologies"?
you say the H.264 will become the standard of HD-products ... but isn't
H.263 allready used in other things like security camera's or so? ... or is
it only within HD security cam and not the bad quality cam's they use in
most of the little shops?
|
HD security cams :)
H.263 quanitzation was originally developed for those very specific
purposes, small video, streaming, low bitrate; but was adapted and used
for popular MPEG4-Part1 codecs like XVID. It doesn't scale well at
higher bitrates and has some limitations.
HD material is already broadcast at MPEG2 in 8VSB or QAM or similar
encoding. But for media (like HD-DVD's or user made content) and web
application, as well as online distribution, H.264/AVC is set to become
an industry accepted standard. At some point though, I wouldn't doubt
STB's (set top boxes -- HD receivers) will decode AVC or it's followup. |
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JFCurry
Guest
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| Posted:
Sat Feb 26, 2005 10:37 pm Post subject:
Re: new videocompression techniques? |
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TompoeS wrote:
| Quote: | Does anyone know some more info about OBJECT-based VS. PIXEL-based
video compression?
How these two work?
Advantages/Disadvantages?
What is mostly used nowadays?
something else:
What is the "definition" of QUALITY ? I mean, which
video-compression you use for which purpose?
|
www.allcanview.de |
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JFCurry
Guest
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| Posted:
Sat Feb 26, 2005 10:38 pm Post subject:
Re: new videocompression techniques? |
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TompoeS wrote:
| Quote: | Does anyone know some more info about OBJECT-based VS. PIXEL-based
video compression?
How these two work?
Advantages/Disadvantages?
What is mostly used nowadays?
something else:
What is the "definition" of QUALITY ? I mean, which
video-compression you use for which purpose?
|
ZDFinfokanal (Sat TV Astra) |
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