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Author Topic: "seeing" sound recorded on video?  (Read 2700 times)

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Offline AmmoJammoTopic starter

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"seeing" sound recorded on video?
« on: August 23, 2015, 10:36:16 am »
Assuming I can link to this public video on facebook...

s


What causes the camera to show the "shock wave" at about 11 seconds?

Someone suggested the lense in the camera flexing, or the camera sensor moving, but then why wouldn't it continue to happen throughout the video?
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Offline German_EE

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Re: "seeing" sound recorded on video?
« Reply #1 on: August 23, 2015, 03:54:44 pm »
A couple of guesses:

1) The air is being severely compressed and forms a lensing effect.

2) The sound level affects one or more sensors in the camera.

I don't think it's the camera lens flexing because a) these are made of glass or hard plastic and b) this would affect the focus. In any event I hope that whoever was holding the camera was wearing earplugs.
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Offline unitedatoms

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Re: "seeing" sound recorded on video?
« Reply #2 on: August 23, 2015, 04:07:24 pm »
s


What causes the camera to show the "shock wave" at about 11 seconds?

Someone suggested the lense in the camera flexing, or the camera sensor moving, but then why wouldn't it continue to happen throughout the video?

It could be difference in grip force of human operator's hand. Humans body mechanics is adaptive filter, so it behaves differently after 11 sec.
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Offline Balaur

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Re: "seeing" sound recorded on video?
« Reply #3 on: August 23, 2015, 04:11:16 pm »
IMHO the explanation is much more mundane: the operator hands were hit by the initial sound wave and that caused the phone to move/tilt/rotate crazy. Since that was the first big bass, the operator wasn't quite prepared. Afterwards, consciously or not, he stabilized the phone better.

EDIT: I agree with unitedatoms, haven't seen his reply before answering.
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Offline codeboy2k

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Re: "seeing" sound recorded on video?
« Reply #4 on: August 24, 2015, 04:29:40 am »
I was watching the sun-visors shake up and down and wondering what his ear drums and microscopic little tiny small eensy fragile irreplacable inner ear bones must be doing right about then...
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