here in the civilized world the way that people are punished for stuff like this is money; it's not a perfect system, but it's the best we've come up with so far.
Maybe I'm old fashioned, but the way we used to punish schoolkids for stuff like this was "detention", "suspension" and "expulsion"... if a crime has been committed and the miscreant is old enough, then "trial" and possibly "sentencing".
Money is a poor way of punishing people unless it's a) proportionate to the perpetrator's means, and b) directed at the guilty party, rather than eg. his parents.
Firstly, it is informative and well-researched to a degree not normally seen around these parts.
Secondly, it is a sign that people with knowledge of climate science are no longer wearily avoiding climate-related subjects on Slashdot (as I usually do) because of the ignorant smug-fest of casual opinion that normally ensues, despite all the pretention of scientific thinking. Full credit to you for wading in with some good info.
Finally, that you got highly moderated is perhaps most encouraging of all. It shows that people are beginning to be receptive to the idea that planetary-scale alterations in atmospheric composition might just lead to changes in climate. It makes a change from sneering cynicism about research motives.
iPod is a proper noun, just like Windows, it works, and it's how Apple refers to their product.
No no, grandparent was entirely correct.
Windows is a piece of software, like iTunes or Photoshop. No definite article required.
iPod is a class of discrete objects, Like computer, Walkman or automobile. Try saying "wheels have been useful in creating automobile"... does that sound OK to you?
You're right that it isn't a mistake (it's intentional of course), but it is still a grammatical error.
If those who are as technically literate as this don't get Linux, how will the "average consumer" ever get it?
Easier than you might think, precicely because the average consumer doesn't have the preconceptions of someone who considers themselves "technically literate" based on a limited world view. It's better to be ignorant and humble than half-smart and prejudiced.
[France have] gone after Yahoo, Google (multiple times now), and even taken swings at that incarnation of evil; Project Gutenberg
You're confused. This is a French news agency we're talking about here, not the French state. Same difference as between SCO and the USA. Not the same thing at all, eh?
By posting the phrase "1 minute 3 seconds of silence" you have digitally reproduced the entire work (in a compression format known as the English language).
jc42, you're a filthy copyright thief! Oh crap. So am I.
I've never hearde one person complain about the DRM - except here on Slashdot
I just spent a couple of hours trying to recover DRM keys for a friend of mine who didn't know enough about digital audio to uncheck the "protect my content" box in the 'rip' dialog of Windows Media Player.
Over the previous year he'd built up about 20 Gb of ripped WMAs until one day Windows decides that it can't find the licence key for any of his tunes. This wasn't due to a hardware change or even a Windows Update (ironically it happened right after listening to an autoplay-DRM audio CD, but I can't pin the blame for sure)
Anyway, his files are now 100% useless. Sure, he still has the CDs and can rip them again - but my god that's a lot of wasted effort for a couple of hundred CDs.
Last week he didn't even know what DRM was. He does now, and I don't think he likes it much.
Anytime you have physical access to a computer all bets are off as far as security.
That's simply not true in this case. Preventing access to data when physical security is breached is the primary reason for encrypted filesystems. The thief who has unrestricted "physical access" to your work laptop should not be able to crack into an encrypted filesystem, Emergency Boot CD or no.
If the encryption key is sitting there on the hard drive, protected only by user-based access control (as the grandparent post seems to imply) then the whole setup is horrendously broken. Such a stupid system is equally possible on Linux or Windows of course.
For encrypted filesystems to be meaningful, the encryption key needs to be protected by a decent password that's not stored anywhere on the disk (duh). Sure, it's a PITA to enter each time you boot your computer, but otherwise you might as well not bother.
There is strong agreement on all these matters, but the trends are very different according to what time scales you look at (millenia vs hundreds of millions of years). Advocates will typically pick the time scale that suits them best.
It's a complicated issue. Sorry if it's not possible to dumb it down enough for you.
It's the closest thing I know of to an OSS Mathematica. It is to Mathematica what The Gimp is to Photoshop. Namely, it's a fair way behind the front runner but still very usable.
Pleased: Despite all the MS bashing that occurs here, MS does make some very nice A/V codecs.
Have you seen the Microsoft "reference" software for MPEG-4? I have very rarely seen such merciless abuse of the C++ language. The standard itself is excellent, but the MS software is horrible.
I Honestly, I can't see how it would be possible to reliably reconstruct the data that produced the hash
True - but that's not necessarily the problem. Think of (for example) the RIAA polluting peer-to-peer networks. If you can quickly generate a hash collision for any given file, you can produce a load of junk with the same hash as the 'good' file.
Actually, that's pretty much what the US did. It asked the Taliban to extradite Bin Laden or else. The Taliban said no, and the US answered "OK, then else." War followed.
You weren't paying attention, or you're trying to rewrite history. The Taliban did not say no, they said "We'll extradite him, but only to a neutral country for trial". But that wasn't an acceptable solution because it would have averted war. Predictably, war did indeed follow.
I used to project films for a local cinama (here in the UK) from the age of 15. Films I wasn't even legally entitled to watch.
Large multiplex cinemas may have well-paid, adult projectionists with night-vision monocles and decent security - but there are thousands of smaller single-screen cinemas where any old kid (like me) runs the projector for pocket money. All it takes is for one of them to bring in a camcorder.
I know FreeBSD is an excellent OS, and the favorite BSD for ISPs, but there are some who will be discouraged by the amateurish baby red devil marketing scheme.
If so, these people should not be making technical decisions. They put themselves at an unnecessary disadvantage.
But you just compressed the video signal by subsampling the U and V components. True uncompressed video has full resolution also on U and V.
Rubbish. You assumed I started off with YUV444. U & V subsampling is only 'compression' if you originally captured those components at a higher resolution and then downsampled them. That's usually not the case (eg the 'raw' format of my digital camera is a 12 bpp YUV).
Would you consider 8 bbp RGB to be compressed because it has a lower sample precision than 16 bpp RGB? Maybe - but it depends on the capture format.
Oh, you're right. I didn't see that bit of the readme.
My own experience is that OBMC is no substitute for mesh-based motion, inventing the photocopier and generally being above the law.
You just calculated the figures for 24-bit RGB. As I said in my original post, I was assuming YUV 420 - as this is the most common format for uncompressed video.
In this example the Y (luma) component is 720x576, but the U and V (chroma) components are subsambpled to 352x288 each. This results in half the amount of raw data versus 24-bit RGB at virtually no loss in perceived quality.
If they hold a full, uncompressed movie, they're good enough.
Frame size: 720 x 576
Frame rate: 30 fps
Chroma subsampling: 1.5 (assuming YUV 4:2:0)
Duration: 90 mins
720*576*30*1.5*90*60 / (1024^3)= 93.9 GiB
Conclusion: these discs don't have anywhere near the capacity to hold an uncompressed film. In addition, the drive could not read data off the disc fast enough for real-time playback (max speed was quoted at 16620 KB/s)
Lossless video codecs can get you a ratio of around 10:1 though, so that's a possibility.
... it degrades in a way that is more pleasing to the eye, that is, there aren't any "artifacts"
While this is true in theory, Dirac is using a block-based approach to motion compensation. That means that it most certainly will have blocky artifacts.
What's more, traditional DCT-based codecs typically have sophisticated deblocking algorithms to smooth over the block boundaries. During my 2-minute peek at the Dirac source code I couldn't see any sign of deblocking at all.
That said, the source looks clean, minimal and very readable. It would be an excellent starting point for anyone looking to play around with wavelet video.
Slashdot Mirror
here in the civilized world the way that people are punished for stuff like this is money; it's not a perfect system, but it's the best we've come up with so far.
Maybe I'm old fashioned, but the way we used to punish schoolkids for stuff like this was "detention", "suspension" and "expulsion"... if a crime has been committed and the miscreant is old enough, then "trial" and possibly "sentencing".
Money is a poor way of punishing people unless it's a) proportionate to the perpetrator's means, and b) directed at the guilty party, rather than eg. his parents.
- Firstly, it is informative and well-researched to a degree not normally seen around these parts.
- Secondly, it is a sign that people with knowledge of climate science are no longer wearily avoiding climate-related subjects on Slashdot (as I usually do) because of the ignorant smug-fest of casual opinion that normally ensues, despite all the pretention of scientific thinking. Full credit to you for wading in with some good info.
- Finally, that you got highly moderated is perhaps most encouraging of all. It shows that people are beginning to be receptive to the idea that planetary-scale alterations in atmospheric composition might just lead to changes in climate. It makes a change from sneering cynicism about research motives.
Things are looking up.No no, grandparent was entirely correct.
- Windows is a piece of software, like iTunes or Photoshop. No definite article required.
- iPod is a class of discrete objects, Like computer, Walkman or automobile. Try saying "wheels have been useful in creating automobile"... does that sound OK to you?
You're right that it isn't a mistake (it's intentional of course), but it is still a grammatical error.To me a lot of these effects are just copied from OS X
Are you implying that that's a bad thing? OS X has many nice GUI features. I'd like to see some of them on my Linux desktop
If those who are as technically literate as this don't get Linux, how will the "average consumer" ever get it?
Easier than you might think, precicely because the average consumer doesn't have the preconceptions of someone who considers themselves "technically literate" based on a limited world view. It's better to be ignorant and humble than half-smart and prejudiced.
[France have] gone after Yahoo, Google (multiple times now), and even taken swings at that incarnation of evil; Project Gutenberg
You're confused. This is a French news agency we're talking about here, not the French state. Same difference as between SCO and the USA. Not the same thing at all, eh?
By posting the phrase "1 minute 3 seconds of silence" you have digitally reproduced the entire work (in a compression format known as the English language).
jc42, you're a filthy copyright thief!
Oh crap. So am I.
I've never hearde one person complain about the DRM - except here on Slashdot
I just spent a couple of hours trying to recover DRM keys for a friend of mine who didn't know enough about digital audio to uncheck the "protect my content" box in the 'rip' dialog of Windows Media Player.
Over the previous year he'd built up about 20 Gb of ripped WMAs until one day Windows decides that it can't find the licence key for any of his tunes. This wasn't due to a hardware change or even a Windows Update (ironically it happened right after listening to an autoplay-DRM audio CD, but I can't pin the blame for sure)
Anyway, his files are now 100% useless. Sure, he still has the CDs and can rip them again - but my god that's a lot of wasted effort for a couple of hundred CDs.
Last week he didn't even know what DRM was. He does now, and I don't think he likes it much.
I think you're looking for this:
Monkey Hot Or Not
Anytime you have physical access to a computer all bets are off as far as security.
That's simply not true in this case. Preventing access to data when physical security is breached is the primary reason for encrypted filesystems. The thief who has unrestricted "physical access" to your work laptop should not be able to crack into an encrypted filesystem, Emergency Boot CD or no.
If the encryption key is sitting there on the hard drive, protected only by user-based access control (as the grandparent post seems to imply) then the whole setup is horrendously broken. Such a stupid system is equally possible on Linux or Windows of course.
For encrypted filesystems to be meaningful, the encryption key needs to be protected by a decent password that's not stored anywhere on the disk (duh). Sure, it's a PITA to enter each time you boot your computer, but otherwise you might as well not bother.
There is strong agreement on all these matters, but the trends are very different according to what time scales you look at (millenia vs hundreds of millions of years). Advocates will typically pick the time scale that suits them best.
It's a complicated issue. Sorry if it's not possible to dumb it down enough for you.
Maxima:
It's the closest thing I know of to an OSS Mathematica. It is to Mathematica what The Gimp is to Photoshop. Namely, it's a fair way behind the front runner but still very usable.
Slashdot is news for nerds and most nerds are playing HL2 right now
Rubbish. Most nerds are lamenting the fact Valve stuck two fingers up at their OS and left them out in the cold.
Pleased: Despite all the MS bashing that occurs here, MS does make some very nice A/V codecs.
Have you seen the Microsoft "reference" software for MPEG-4? I have very rarely seen such merciless abuse of the C++ language. The standard itself is excellent, but the MS software is horrible.
I Honestly, I can't see how it would be possible to reliably reconstruct the data that produced the hash
True - but that's not necessarily the problem. Think of (for example) the RIAA polluting peer-to-peer networks. If you can quickly generate a hash collision for any given file, you can produce a load of junk with the same hash as the 'good' file.
Actually, that's pretty much what the US did. It asked the Taliban to extradite Bin Laden or else. The Taliban said no, and the US answered "OK, then else." War followed.
You weren't paying attention, or you're trying to rewrite history. The Taliban did not say no, they said "We'll extradite him, but only to a neutral country for trial". But that wasn't an acceptable solution because it would have averted war. Predictably, war did indeed follow.
>> the real world is much more complicated than that
> Not if you're George W. Bush.
Well, "real world" is the key phrase here.
I used to project films for a local cinama (here in the UK) from the age of 15. Films I wasn't even legally entitled to watch.
Large multiplex cinemas may have well-paid, adult projectionists with night-vision monocles and decent security - but there are thousands of smaller single-screen cinemas where any old kid (like me) runs the projector for pocket money. All it takes is for one of them to bring in a camcorder.
I know FreeBSD is an excellent OS, and the favorite BSD for ISPs, but there are some who will be discouraged by the amateurish baby red devil marketing scheme.
If so, these people should not be making technical decisions. They put themselves at an unnecessary disadvantage.
But you just compressed the video signal by subsampling the U and V components. True uncompressed video has full resolution also on U and V.
Rubbish. You assumed I started off with YUV444. U & V subsampling is only 'compression' if you originally captured those components at a higher resolution and then downsampled them. That's usually not the case (eg the 'raw' format of my digital camera is a 12 bpp YUV).
Would you consider 8 bbp RGB to be compressed because it has a lower sample precision than 16 bpp RGB? Maybe - but it depends on the capture format.
You're right about the OP.
Oh, you're right. I didn't see that bit of the readme. My own experience is that OBMC is no substitute for mesh-based motion, inventing the photocopier and generally being above the law.
You just calculated the figures for 24-bit RGB. As I said in my original post, I was assuming YUV 420 - as this is the most common format for uncompressed video.
In this example the Y (luma) component is 720x576, but the U and V (chroma) components are subsambpled to 352x288 each. This results in half the amount of raw data versus 24-bit RGB at virtually no loss in perceived quality.
If they hold a full, uncompressed movie, they're good enough.
Frame size: 720 x 576
Frame rate: 30 fps
Chroma subsampling: 1.5 (assuming YUV 4:2:0)
Duration: 90 mins
720*576*30*1.5*90*60 / (1024^3)= 93.9 GiB
Conclusion: these discs don't have anywhere near the capacity to hold an uncompressed film. In addition, the drive could not read data off the disc fast enough for real-time playback (max speed was quoted at 16620 KB/s)
Lossless video codecs can get you a ratio of around 10:1 though, so that's a possibility.
... it degrades in a way that is more pleasing to the eye, that is, there aren't any "artifacts"
While this is true in theory, Dirac is using a block-based approach to motion compensation. That means that it most certainly will have blocky artifacts.
What's more, traditional DCT-based codecs typically have sophisticated deblocking algorithms to smooth over the block boundaries. During my 2-minute peek at the Dirac source code I couldn't see any sign of deblocking at all.
That said, the source looks clean, minimal and very readable. It would be an excellent starting point for anyone looking to play around with wavelet video.
"Any sufficiently advanced technology is indistinguishable from magic."--Arthur C. Clarke
It really makes me sad when, if people don't understand something they assume it's advanced technology.