No. DV is higher quality because it's not compressed as much. DV is like MPEG-2 with I-frames only. DVD is MPEG-2 with a series of I-, B-, and P-frames. The B- and P- frames compress better than I-frames only, but lose quality.
DVD can reach higher qualities IF you use high bit rates and spend a LOT of computation time to compute the B- and P-frames. But a camera that has to stream to hard disk in realtime is NOT going to be able to put that kind of horsepower into computing the intermediate frames.
At a given bit rate, and with the kind of electronics in a camera, DV is going to be higher quality and simpler to produce.
DV has a post-processing advantage over DVD in that, because it's I-frames only, it's easier to edit in a program like Premier.
MPEG2 or MPEG4 could be stored at a higher resolution for the same data rate and would look dramatically better.
DV and DVD both use the same resolution, 720x480. As for data rates, you just can't compare DV and DVD. DV operates at a higher data rate than DVD was ever intended to. Contrariwise, DV can't realistically operate at the low data rates of DVD. DVD and DV operate at different ends of a data-rate vs compute-power tradeoff.
At their best data rates - DV's typical 25 megabit per second, vs DVD's max MPEG-2 rate of about 9 megabit, their quality is comparable, and very very good. I find that DV always looks better than MPEG-2 at DVD specs, but DVD can get very close.
Yup. At DV quality, a 60GB drive would hold over four hours of video.
You could get much more video if you reduced the quality to DVD quality, but video editing programs like Premier work much better with DV - probably because it's I-frame only, and you don't have inter-frame dependencies to manage.
Personally, I'd settle for 15GB at DV quality. That would give about the same quality (DV for one hour) as a single mini-DV tape. That would work for me, because I always travel with my FireWire-equipped laptop, and I rarely need to shoot more than an hour at a stretch, so I could always dump the camcorder to the laptop, then go back to shooting.
That said, a bigger 60GB drive would be great to have, and I guess the option to drop down to DVD quality might be nice to have for certain occasions.
King Arthur: One... Two... Five! Sir Galahad: Three, sir! King Arthur: Threeeeeeee! [lobs grenade] [angels sing] [BOOM!]
The really funny thing is that, in the time it took Galahad to correct him, he could have counted to five ANYWAY!
God, I just love that scene. The pythons were never as funny as when they were lampooning religion.
And Saint Attila raised the hand grenade up on high, saying, 'O Lord, bless this Thy hand grenade that, with it, Thou mayest blow Thine enemies to tiny bits in Thy mercy.'
The English language already has a word like this. It's the transitive verb "mimic" (mimicked, mimicking). Please don't make up any more new words, or we shall be forced to send a large brutish person over to your house to shove a copy of Webster's 2nd down your throat.
Thank You Usage Enforcement Agency, Large Brutish Person Division
The one labeled "Duty cycle 50%". Now, instead of Ra and Rb being separate resistors, they are a potentiometer. Connect one end of the pot to pin 8, the other end to pin 6, and the center tap to pin 7. Don't forget the diode.
Just for grins, I got out my circuit box last night and wired up one of these, using a 10K pot and a capacitor to get a frequency of about 500Hz. I used it to drive a high-brightness blue LED, and it worked nicely. It seemed a bit nonlinear at the extreme ends of the pot's adjustment range, but appeared nicely linear in-between. Fun to play with circuits again... I can't believe I never found a chance to use a 555 as an adjustable duty-cycle driver for an LED. (BTW, with a power transistor as a driver, this circuit would probably also work well for driving cheap DC motors at low speeds - better than a rheostat, I would expect.)
Just what I was thinking, dude, but you shouldn't need the external comparator. Look at this page: http://www.williamson-labs.com/555-circuits.htm, in particular the astable configuration with the diode across R2 to get a more variable duty cycle. Do that, but instead of separate R1 and R2, use a linear pot. Hook pin 7 up the pot center tap. The RC frequency stays constant, but by twisting the pot, you vary the duty cycle from low to high.
Yeah, I did a Life program too, in assembly. Also wrote an assembly version of a one-dimensional cellular automaton. I remember optimizing the heck out of the screen-scrolling routine, which was the limiting factor on how fast it could run. I eventually hit upon the idea of turning off hardware interrupts, then using the stack pointers, together with a software interrupt, to move bigger chunks of memory in fewer instructions - because the interrupt-servicing instructions could load or save multiple registers in one instruction. Something like that - wish I could remember the details.
Yeah, I loved the MASM cartridge. It was the only one I ever bought. Someone told me how to dump its contents to a disk file, so I could load it off of floppy. Otherwise, you couldn't use the cartridge and the floppy at the same time, because the floppy drive plugged into the cartridge slot.
Yeah, those were the days. (But how my GPA would have improved if I hadn't cut so many classes to hack code!)
I did the same with my CoCo - I was about 19 at the time. Hating waiting on its slow BASIC interpreter. Fortunately, I knew its assembly language and even had the Macro-assembler cartridge. I thought about how to program it it assembler, but didn't want to attempt writing floating point routines, or trying to call the floating poing routines in the ROM. Eventually, I realized that you could calculate a Mandelbrot set using fixed-point math. The 6809's MUL instruction made it a snap - you just shift the decimal... er, binary point. I eventually was able to generate a Mandelbrot set in just a few minutes.
And when you reassemble the cube, make sure you assemble it into a solved state... even if you know how to solve it. If you assemble it into a random state, there's only a 1 in 12 chance that it's solvable without another disassembly.
Considering the damage caused by the Hurricanes this season...
What damage? The VAB lost a number of sheet-metal panels. The tile fab shop lost a roof. Some other buildings sustained minor water damage. The OPF lost power once or twice. NO FLIGHT HARDWARE WAS DAMAGED. The schedule slip was due as much to the hurricane preparation exercises as to the repair activities. Schedule impact was measured in weeks, not months.
And what kind of glue or ductape would work without dissolving the cables or turning them to a permanent sticky mess?
Not glue. Not duct tape. Cable ties. Small ones for small wires, larger ones for PATA and SCSI cables. If you want to tie off to part of the case, either wrap the tie around the case or thread the tie through a sticky base. For flat cables, you don't have to pull the tie TIGHT; you can leave it loose enough to keep the cable in place without mangling its shape.
Haven't RTFA - it's toast. But this is what I do in my cases, and it works just fine.
Cable (with all its port blocking glory) is $39.99/mo for 3000/256.
Not all the cable providers block ports. I've got Earthlink (resold Time Warner Road Runner) in the Houston area and they don't block any of my ports. Speed is decent too: 3000/350 for $39.99/month. Best of all, Earthlink/Time Warner don't make you load any of their crappy PC software. It's just plain old DHCP+TCP/IP from the PC/router's point of view. I've been very happy with their service, although I wouldn't mind getting the Verizon 5MB/2MB for the same price.
I could fill this up on a backpacking expedition or vacation.
Sounds like you're talking about storing photos as you take them, but the original poster was talking about photos stored for playback.
At 290 pics per GB, your photos weigh about 3 MB each. That's big - either you store them at high resolution, uncompressed, or both. For archiving, that makes sense, but you don't need that kind of quality for playing on a tiny color LCD or even on a television. You can shrink the photos down to NTSC 740x480 (slightly higher for PAL), and compress as JPEG at -q 75. On a TV or the iPod's 16-bit color, they'll look just as good. With those parameters, you can get thousands of photos per GB, not just a few hundred.
Slashdot Mirror
...Microsoft will be trying to patent the see-n-say. Is nothing obvious?
DVD is higher quality than DV
No. DV is higher quality because it's not compressed as much. DV is like MPEG-2 with I-frames only. DVD is MPEG-2 with a series of I-, B-, and P-frames. The B- and P- frames compress better than I-frames only, but lose quality.
DVD can reach higher qualities IF you use high bit rates and spend a LOT of computation time to compute the B- and P-frames. But a camera that has to stream to hard disk in realtime is NOT going to be able to put that kind of horsepower into computing the intermediate frames.
At a given bit rate, and with the kind of electronics in a camera, DV is going to be higher quality and simpler to produce.
DV has a post-processing advantage over DVD in that, because it's I-frames only, it's easier to edit in a program like Premier.
MPEG2 or MPEG4 could be stored at a higher resolution for the same data rate and would look dramatically better.
DV and DVD both use the same resolution, 720x480. As for data rates, you just can't compare DV and DVD. DV operates at a higher data rate than DVD was ever intended to. Contrariwise, DV can't realistically operate at the low data rates of DVD. DVD and DV operate at different ends of a data-rate vs compute-power tradeoff.
At their best data rates - DV's typical 25 megabit per second, vs DVD's max MPEG-2 rate of about 9 megabit, their quality is comparable, and very very good. I find that DV always looks better than MPEG-2 at DVD specs, but DVD can get very close.
Yup. At DV quality, a 60GB drive would hold over four hours of video.
You could get much more video if you reduced the quality to DVD quality, but video editing programs like Premier work much better with DV - probably because it's I-frame only, and you don't have inter-frame dependencies to manage.
Personally, I'd settle for 15GB at DV quality. That would give about the same quality (DV for one hour) as a single mini-DV tape. That would work for me, because I always travel with my FireWire-equipped laptop, and I rarely need to shoot more than an hour at a stretch, so I could always dump the camcorder to the laptop, then go back to shooting.
That said, a bigger 60GB drive would be great to have, and I guess the option to drop down to DVD quality might be nice to have for certain occasions.
King Arthur: One... Two... Five!
Sir Galahad: Three, sir!
King Arthur: Threeeeeeee! [lobs grenade]
[angels sing]
[BOOM!]
The really funny thing is that, in the time it took Galahad to correct him, he could have counted to five ANYWAY!
God, I just love that scene. The pythons were never as funny as when they were lampooning religion.
And Saint Attila raised the hand grenade up on high, saying, 'O Lord, bless this Thy hand grenade that, with it, Thou mayest blow Thine enemies to tiny bits in Thy mercy.'
Chinese Team Heading for Coldest Spot on Earth
They're going to visit Courtney Love's vagina? Big deal, plenty of men have been THERE before.
The English language already has a word like this. It's the transitive verb "mimic" (mimicked, mimicking). Please don't make up any more new words, or we shall be forced to send a large brutish person over to your house to shove a copy of Webster's 2nd down your throat.
Thank You
Usage Enforcement Agency,
Large Brutish Person Division
Look at the circuit diagram on this page:
http://www.williamson-labs.com/555-circuits.htm
The one labeled "Duty cycle 50%". Now, instead of Ra and Rb being separate resistors, they are a potentiometer. Connect one end of the pot to pin 8, the other end to pin 6, and the center tap to pin 7. Don't forget the diode.
Just for grins, I got out my circuit box last night and wired up one of these, using a 10K pot and a capacitor to get a frequency of about 500Hz. I used it to drive a high-brightness blue LED, and it worked nicely. It seemed a bit nonlinear at the extreme ends of the pot's adjustment range, but appeared nicely linear in-between. Fun to play with circuits again... I can't believe I never found a chance to use a 555 as an adjustable duty-cycle driver for an LED. (BTW, with a power transistor as a driver, this circuit would probably also work well for driving cheap DC motors at low speeds - better than a rheostat, I would expect.)
Just what I was thinking, dude, but you shouldn't need the external comparator. Look at this page: http://www.williamson-labs.com/555-circuits.htm, in particular the astable configuration with the diode across R2 to get a more variable duty cycle. Do that, but instead of separate R1 and R2, use a linear pot. Hook pin 7 up the pot center tap. The RC frequency stays constant, but by twisting the pot, you vary the duty cycle from low to high.
Too cool, dude.
Yeah, I did a Life program too, in assembly. Also wrote an assembly version of a one-dimensional cellular automaton. I remember optimizing the heck out of the screen-scrolling routine, which was the limiting factor on how fast it could run. I eventually hit upon the idea of turning off hardware interrupts, then using the stack pointers, together with a software interrupt, to move bigger chunks of memory in fewer instructions - because the interrupt-servicing instructions could load or save multiple registers in one instruction. Something like that - wish I could remember the details.
Yeah, I loved the MASM cartridge. It was the only one I ever bought. Someone told me how to dump its contents to a disk file, so I could load it off of floppy. Otherwise, you couldn't use the cartridge and the floppy at the same time, because the floppy drive plugged into the cartridge slot.
Yeah, those were the days. (But how my GPA would have improved if I hadn't cut so many classes to hack code!)
I did the same with my CoCo - I was about 19 at the time. Hating waiting on its slow BASIC interpreter. Fortunately, I knew its assembly language and even had the Macro-assembler cartridge. I thought about how to program it it assembler, but didn't want to attempt writing floating point routines, or trying to call the floating poing routines in the ROM. Eventually, I realized that you could calculate a Mandelbrot set using fixed-point math. The 6809's MUL instruction made it a snap - you just shift the decimal... er, binary point. I eventually was able to generate a Mandelbrot set in just a few minutes.
... remove all pieces ...
And when you reassemble the cube, make sure you assemble it into a solved state... even if you know how to solve it. If you assemble it into a random state, there's only a 1 in 12 chance that it's solvable without another disassembly.
The bestselling games in history sold, not a million, but millions and tens of millions of copies.
Parker Brothers has sold over two hundred million copies of Monopoly in 65 years. Not the same kind of game, but geeze...
He has memorized ... over 7600 books.
Yeah, but I wonder what his level of understanding of those books is. Is there a quantity vs quality tradeoff going on there?
That would be a better comparison. However, on linux systems, I would prefer 'dd if=/dev/urandom of=/dev/hda'.
Considering the damage caused by the Hurricanes this season...
What damage? The VAB lost a number of sheet-metal panels. The tile fab shop lost a roof. Some other buildings sustained minor water damage. The OPF lost power once or twice. NO FLIGHT HARDWARE WAS DAMAGED. The schedule slip was due as much to the hurricane preparation exercises as to the repair activities. Schedule impact was measured in weeks, not months.
And what kind of glue or ductape would work without dissolving the cables or turning them to a permanent sticky mess?
Not glue. Not duct tape. Cable ties. Small ones for small wires, larger ones for PATA and SCSI cables. If you want to tie off to part of the case, either wrap the tie around the case or thread the tie through a sticky base. For flat cables, you don't have to pull the tie TIGHT; you can leave it loose enough to keep the cable in place without mangling its shape.
Haven't RTFA - it's toast. But this is what I do in my cases, and it works just fine.
Guess Frodo, Bilbo and the remaining elves made a wrong turn on the way to the Grey Havens.
Hey, this isn't Pismo Beach... Bilbo, I told you we should have taken that left turn at Albuquerque!
Oompa loompa doompety doo ...
I've got a perfect puzzle for you
Oompa loompa doompety dee
If you are wise you'll listen to me
Oompa loompa doompety da
If you're not greedy, you will go far
You will live in happiness too
Like the Oompa Loompa Doompety do
Doompety do
Q: What kind of machine does Longhorn run best on?
A: A slide projector.
(Old joke. cat nt-joke-1990.txt | sed -e 's/Windows NT/Longhorn/g')
Cable (with all its port blocking glory) is $39.99/mo for 3000/256.
Not all the cable providers block ports. I've got Earthlink (resold Time Warner Road Runner) in the Houston area and they don't block any of my ports. Speed is decent too: 3000/350 for $39.99/month. Best of all, Earthlink/Time Warner don't make you load any of their crappy PC software. It's just plain old DHCP+TCP/IP from the PC/router's point of view. I've been very happy with their service, although I wouldn't mind getting the Verizon 5MB/2MB for the same price.
I could fill this up on a backpacking expedition or vacation.
Sounds like you're talking about storing photos as you take them, but the original poster was talking about photos stored for playback.
At 290 pics per GB, your photos weigh about 3 MB each. That's big - either you store them at high resolution, uncompressed, or both. For archiving, that makes sense, but you don't need that kind of quality for playing on a tiny color LCD or even on a television. You can shrink the photos down to NTSC 740x480 (slightly higher for PAL), and compress as JPEG at -q 75. On a TV or the iPod's 16-bit color, they'll look just as good. With those parameters, you can get thousands of photos per GB, not just a few hundred.
That's nothing. My uncle can cut roast beef so thin it only has one side. The cheap bastard...
The GPL doesn't lend itself to ``free, non-commercial use'': it lets the licensee use and distribute freely, at any price, for any use.
Perhaps what they meant was "free, non-proprietary use," which would be GPL-compatible.