Posted on 01/24/2015 9:43:34 PM PST by Swordmaker
This is such clever and awesome idea! Who would have thought putting your iPhone 4 inside a guitar and using its camera could create such cool and creative video. I never really did see this coming and this is such a novel idea that most people haven’t seen or tried such an experiment before. Learn more from this video and you might want to try it for yourself! Have you seen such before?
See video at link
(Excerpt) Read more at liketodiscover.com ...
Well, when I look at that upthread video, I see all kinds of waves that are not pure sinusoidal in shape. So I guess our eyes are different. It’s called overtones... you have multiple standing waves superimposed. While they are a superposition of sine waves, the composite wave may not look sine-like.
Just think of Fourier superposition. You can create any wave shape as a superposition of sine waves.
Show me all those other iPhone from inside guitar videos you claim exist.
Look, if all you have now are insults... You’ll never learn anything.
They are all sine waves. The periodization looks weird, but the sqaure edges are what proves the original video out as fake.
I’d like to see the equation for sampling a sine wave with sqaure edges...
Take your time. I’ll wait.
There have been several posted in this thread. Some, more than once.
You’ve been using computers for forty years and haven’t figured out a google search?
Yeah, I looked it and what I see is a bunch of non-sine shapes like in the original video. Your theory gets shot down by sawtooths as well as squares, and there are plenty of those in both.
Nope. Watch the origianl. Then watch the second video. Then watch the guitar/violin video.
The latter two show various amplitudes on a sine wave with the weird spacing on the periodization. You also get the traveling sine wave effect as expected. While the higher frequncy sines look peaky, they are still rounded.
What you’d expect no matter what rate your digital camera was capturing at.
Now watch the first video. There are well defined squares. So...
Fake.
Here's a slow motion video from a Brazilian guitarist showing the motion of his guitar strings taken on a Moto X cell phone at 60 frames per second and then played back at 30, but shown longitudinally, along the strings, not across them so that the scan line of the shutter does not introduce artifacting to the sine wave. You will see that guitar strings do indeed have such a magnitude of motion. So much for that argument. There's another video on YouTube taken at 1000 & 2000 frames per second, but it looks as if the videographer loosened the strings because they appear floppy, but that may be an artifacting of the high frame rates.
This video shows some interesting wave artifacting on a a guitar and a violin as well.
I don’t see well-defined squares in the first video. I see squarish shapes but none with truly vertical walls or truly sharp corners. In other words they are just weird complex shapes that seem fully explainable through video artifacting without needing to resort to far fetched Photoshop theories.
Look Dead, I am not insulting you. You ARE being stubborn. You are the one who is taking the outlying position here against people who have studied wave form analysis as a profession. . . as some have pointed out. This is not a fake. Others have explained how the a CMOS shutter can make such artifacting can result in this. . . yet you keep insisting on an absurd position when there are lots of examples of similar videos. That is stubborn in my book. Not an insult. I don't HAVE to learn anything. It strikes me that it is you that needs to do the learning. Look up beat frequencies, Fourier transformations, and stop making the assumption that all waves have to be synodal in shape. Even a guitar string develops multiple waves when plucked, not just a single node and sometimes as seen in the picture fireman posted above the build on each other, creating a saw-tooth effect that with the CMOS.
BINGO! Exactly what I have been trying to explain to Dead Corpse
Look at the video I posted in reply 88 with the violin. . . and there are distinctly squarish waves in the bowing. . . artifacts of the video . . . especially in the rightmost string when it is bowed most loudly. The peaks are distinctly flattened.
Yep, in fact the squarish shapes in the violin video are actually better defined than in the original video. Yet I feel pretty confident that dad and young son aren’t punking us with photoshop.
The two links you just added look more believable than the one being discussed.
As far as the difficulty of making a fake video... Computer-generated imagery (CGI) has come a long way in the past few years. I am fairly certain that this would not be a difficult illusion to accomplish for a skilled technician. I did find a link to a video from several years ago entitled, “Tutorial: Making a String Vibrate with Audio in After Effects”.
However I noticed that this video was actually uploaded over three years ago. There are so many similar videos on YouTube uploaded by people who are most likely not capable of producing sophisticated fakes that I must now admit that the probability is that the video that started the thread is probably not a fake. Thank you for the explanations and your patience.
My brother and I made a couple fake flying videos many years ago when we first started using camcorders as a joke. It was surprising to us that most people believed that they were real.
A smartphone (or DSLR, or digital point-and shoot) isn’t like a film or videotape camera, opening the shutter 24 or 30 times a second and capturing a whole frame in an instant. It uses a rolling shutter, capturing a line at a time from the top to the bottom 30 (or 60, etc.) times a second. That creates some effects you don’t see with cameras that grab discrete frames.
If I think something is faked, I will research it and prove it so. . . I am a great believer in truth. And vice verse
They still create discrete frames. . . the playback has to be framed for editing, and display. . . however the capture is accomplished. It can be done like in CCD every pixel at one, or like CMOS, a line at a time but still resulting in 30 discrete frames per seconds. The artifacting of moving objects will differ.
Well I would not have believed the original video was real without the explanations that you and a couple of others provided which caused me to look into the matter further. In today’s world I believe that a healthy amount of skepticism is essential. But sometimes the truth is stranger than what we imagine it to be.
>>>I’d like to see the equation for sampling a sine wave with sqaure edges...Take your time. I’ll wait.
No need to wait: http://mathworld.wolfram.com/images/eps-gif/FourierSeriesSquareWave_800.gif
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