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Waveform Etiquette

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FuzzMartin
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Posted Fri May 16, 2008 9:06PM

I know that iStock Audio is in its infancy, but I'm really hoping for the waveform representations to be in line with the industry.


For instance, here is a representation of an audio clip that I uploaded that has a tone that plays every second, followed by silence:


waveform


As you can see, the silence is represented by a thick line.


It should look more like this:


waveform_proper


When I look at purchasing an audio clip from iStockAudio, I'll be able to see that I get three distinct sounds. The way that it sits now, it looks like a 21-second clip full of mud.
PJ Hudson
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Posted Fri May 16, 2008 9:41PM

In a musical composition that has a full band the waveform representation is useless.  rip any commercial CD and look at its waveform-- it's a solid block from beginning to end. 


I'm not sure how you got the bottom picture from the top picture-- in your top picture you must've had some sever background noise or you compressed it until it brought the noise level up to the same level as the samples.


also- keep in mind that the way a waveform looks depends on how you've zoomed in or out to look at it also.
sjlocke
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Posted Fri May 16, 2008 9:47PM
No, I pointed out in another thread, that the waveform looks absolutely nothing like the actual clip. There was a response about levels, but I believe it could better represent the actual levels of the clip.

The top clip is the iStock generated waveform, which looks nothing like the actual waveform in any application.
FuzzMartin
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Posted Fri May 16, 2008 9:54PM
No, no, no... iStock rendered the top waveform from the bottom --> my file. They're the same sounds. It is a sequence of sound effects separated by a half second of dead space, not a musical composition. The bottom is zoomed in a little further than the iStock representation, but only to demonstrate that the dead space should be flat-lined and not thick.

(ETA: I was replying while Mr. Locke added his - mine was in response to PJ)

(Edited on 2008-05-16 21:56:40 by FuzzMartin)
PJ Hudson
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Posted Fri May 16, 2008 11:29PM
oh- I see what you're saying---  in that case istock has added an intense amount of noise (whether percievable or not)-- if the sound still sounds like your clip without any audible noise, then it must be added noise in the frequency spectrum outside of our hearing.
thepugnatious
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Posted Fri May 16, 2008 11:48PM

There has been no noise added to the files, we do recognize that the audio waveform is not exactly representative of the final file. We are currently looking into creating a waveform that is a better representation of the final file.
FuzzMartin
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Posted Sat May 17, 2008 2:49AM
Perfect! Thank you!
procreatemultimedia
Posted Sat May 17, 2008 7:44AM
what is the point of looking at a waveform? kinda of like listening to a picture.
Natural_Warp
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Posted Mon May 19, 2008 5:21AM
to recognize your own uploads - if u would have forgotten which one u just uploaded , or if u uploaded multiple wav's at the time ...
SamBurt
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Posted Fri May 23, 2008 12:27PM
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Posted By procreatemultimedia:
what is the point of looking at a waveform? kinda of like listening to a picture.#


If you know what you're looking at a waveform can tell you loads of informaton without you hearing it; how loud it is, the signal to noise ratio, where the sounds are in the overall clip, how compressed or not the sound is, even whether its a natural or synthetic sound, an instrument or a human voice.
toddmedia
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Posted Fri May 23, 2008 1:00PM
Posted By SamuelBurt: 
If you know what you're looking at a waveform can tell you loads of informaton without you hearing it; how loud it is, the signal to noise ratio, where the sounds are in the overall clip, how compressed or not the sound is, even whether its a natural or synthetic sound, an instrument or a human voice.

Works for a short clip I guess. But when you squeeze a 1, 2, 3 or 4 minute waveform down to a 2 inch wide pic on the screen .... it'll be hard to tell much of anything other than peaks.
FuzzMartin
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Posted Fri May 23, 2008 1:22PM
Posted By toddmedia:

Posted By SamuelBurt:
If you know what you're looking at a waveform can tell you loads of informaton without you hearing it; how loud it is, the signal to noise ratio, where the sounds are in the overall clip, how compressed or not the sound is, even whether its a natural or synthetic sound, an instrument or a human voice.


Works for a short clip I guess. But when you squeeze a 1, 2, 3 or 4 minute waveform down to a 2 inch wide pic on the screen .... it'll be hard to tell much of anything other than peaks.

True, but with a long clip you would be able to see dynamic range. In the iStock representation, though, they all look super compressed since the silent sections are nearly as wide as the peaks.
SamBurt
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Posted Fri May 23, 2008 1:37PM
So does that mean that they are getting compressed by istock when we load them up?
FuzzMartin
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Posted Fri May 23, 2008 2:01PM
Posted By SamuelBurt:
So does that mean that they are getting compressed by istock when we load them up?

No, it just means they got too artsy with their waveform representations.
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