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mikiec66 wrote:Have you tried

mikiec66 said:
Have you tried an external mic?

Mike
hi,

no Mike, dont have one, but at post #31, castellscl confirmed no crackling with external mic.

i think, as someone already said, some bass sounds cause the vibration of something inside camera (could be the mic himself), the mic captures that and it is amplified in recordings. it seems static but itsnt in this case.
since an external mic is away of camera, it will not capture those vibrations but in same situations is not possible/pratical recording with an external mic.
inside waterproof case the camera is more isolated from vibrations and thats why i didnt noticed the crackling noise but the recordings are too muffled.

cheers
 

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Gustl82 wrote:I have just

Gustl82 said:
I have just spoken with my engineering contact about your trouble, and apparently we have just recently found that this issue can be caused by electrical interference from some cars.

Our engineering team is looking to see if we can reduce this interference by filtering out parts of the audio during processing, by making adjustments to the camera's software. Should this be possible, we'll have a free firmware update in the future to optimize the camera's audio for such situations.
Signed up here specifically for this thread. It appears to be getting more attention here than the other GoPro forums. :)

I think GoPro is right that it can be fixed in software, but I am not convinced it's due to interference of any type. As someone else mentioned in one of the linked videos, the car was off and still exhibited the same behavior.

To me it sounds like the mic itself is "capping out" when certain frequencies hit a particular volume, causing distortion when these specific criteria are met. If someone had some audio system test CD's the frequency could probably be narrowed down. I'll have to dig around and see if I can unearth some Techmaster P.E.B. or something. ;)

I think if GoPro were to either adjust whatever loudness/gain compensation curve they have built into the audio recording, or give a selective High/Low sensitivity setting like the first gen cameras had, this could be cleared up.
 

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Crackling sound.

This sound is NOT only in the cars. I used my camera first time yesterday for skiing. Same crackling noise is coming. NOT all videos, only some of them. Why not all?Why only some of them? Interested subject and definitely GoPro technical team has to solve this issue.
 

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I am starting to think that

I am starting to think that the lower frequency sounds causing the cracking due to saturation might be the best explanation. Had the camera stationary outside the car over the weekend and I can hear the crackling just as the car pulls away. Should actually be pretty simple to fix in software if it was this.

As for a external mic fixing this is good to hear, but the problem is still it is not as simple as just plugging a mic in and your done, you need a different housing and an adaptor for the mic, then you also need to look at a mounting for the mic as well. All of this just so I can reduce the noise level so that it is similar to the recordings that my phone can do :~
 

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I totally agree to that. Got

I totally agree to that. Got my GoPro 3 Silver yesterday and have the same cracking issues while driving (or even just rolling over bumps withoput the engine running). It seems to me that the lower frequencies are emphasized by the software (some kind of equalizer to boost those low frequencies) but not limitied to 0dB afterwards. Everything louder than this 0dB causes such type noise (imagine a sinewave whose top is cut off, makes it look like some kind of rectangle ... you know the sound of a square wave fed into a speaker? => sounds just like what we can hear with the gopro). Working with audio in embedded devices for some years now I´ve come across that type of crackling a few times. It´s just overdrive somewhere in the signal chain. I tried to analzye the signa in Adobe Audition, but somewhere at the end the GoPro guys seem to do some kind of signal conditioning, so the overall signal is not overdriven, it must happen much more in front of the signal chain. The worst thing would be if the microphone amplifier itself is overdriven at its input (that would be a hardware issue not possible to be solved in software). Almost everything else should be able to be fixed in software.
 

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I just searched youtube for

I just searched youtube for "gopro silver car"... watched about ten videos of gopro silver & black in cars, and they all had the same issue ...
 

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Did another test ... took the

Did another test ... took the naked GoPro (without any housing), lay it down on my mattress and gently started to drum with my hands on the mattress, close to my GoPro ... guess what? The same crackling sound. So definitely no electrical interference. It´s just the low frequencies I simulated by drumming on the mattress. Checked the audiofile after that to be sure I did not overdrive the microphone => highest level was -5dB (0dB is the upper limit). So definitely something wrong in the GoPro´s audio processing ...
 

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IIIIMadMikeIIII wrote:Glad to

IIIIMadMikeIIII said:
Glad to see this thread really took off. Has anyone heard anything further for a fix?
i think not, i have the silver with the last firmware update from 14feb2013 and the problem still exists.
the question is, is there anyone without this problem ?
 

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Poor quality audio

GoPro support wants me to believe it is an RF problem in my camera. I strongly disagree. I have the same problem in more than one vehicle, and one of them is low tech, no fancy electronics to be found in that car. I believe it is the way the camera processes low frequency sound.

I am giving up and going with an external microphone. I am not optimistic this will solve the problem.
 

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This is the last reply from

This is the last reply from GoPro:

Unfortunately I do not have any news regarding an update to address the audio interference issue with the Hero3. This is definitely a high priority for us and I would expect a fix in the near future. Thanks for your patience.
 

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Someone mentioned trying to

Someone mentioned trying to put tape over the speakers to lessen the audio crackling issue. In modifying The Frame, that is essentially what that mount does with those dust covers in the housing. I removed them completely on mine. They are just pieces of sticky tape applied to both sides of the plastic casing. I was not looking at this particular problem when i got my new mount (The Frame) and did modifications on it. In reality, I didn't care at all for that mounty setup and found the better product was the clear Gopro housing, modified to accept an external mic. I am wondering though if perhaps someone who uses The Frame has ever set it up inside their car to see if they get the same noise when using it? You would have to set it up, but not use the external mic. The external mic would negate the experiment results in finding out if the issue is firmware or if it was noise transfer because of any car influences. Mine is modified now and not the same as something off the shelf, so I can't do this test, but I was wondering what impact it may have or not with this particular isssue.

For any variety of reasons, I really prefer the use of a good external mic with my GoPro Hero 3 Silver. I was not expecting to have to purchase extra audio equipment with this new camera just to come up to the same audio standard as my old Hero 960. I also was not expecting to have to purchase a second or third housing to even plug in the necessary wires or cables for the extra audio equipment, but there is no way in the world that the stock GoPro internal mic produces quality audio on its own by any stretch of the imagination. GoPro sucked big time when they made such drastic errors with this new camera and to this date has not corrected the situation. Hopefully they do know of their error and are at least attempting to correct it, but somehow they seem overly lax in doing so at this point.
 

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Shadetree930 wrote:GoPro

Shadetree930 said:
GoPro support wants me to believe it is an RF problem in my camera. I strongly disagree. I have the same problem in more than one vehicle, and one of them is low tech, no fancy electronics to be found in that car. I believe it is the way the camera processes low frequency sound..
you are right, its the low freq (bass) processing. i also have the crackling riding my bicycle (no RF near).
since begining of february gopro told me they are working in a firmware to fix this issue.
 

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Crackling issue

Just started to look into this issue after experiencing the exact same crackling audio issue with my new Hero 3 Black edition running latest firmware. The sound occurred on all the footage I took while it was mounted to the front bar on my 4x4. I have some fairly high end audio gear here and i noticed as soon as I listened to the first clip that there was a huge amount of low end bass in the recording and that the clipping sound (crackling) also seemed to correlate with the periods of the bass being loudest.

I am also convinced after reading this thread that there is something very funky going on with that on-board microphone that is causing it to be hyper sensitive to bass frequencies and as a result it is clipping the audio badly. I for one am very disappointed as the waterproof housing is a must have with an external vehicle mount, especially a vehicle that is often submerged in rivers and mud pools.

I loaded the audio from one of the clips into some audio software and isolated the bottom end rumble / hum to be around the 50hz range. With bass responsive headphones / monitors it is an almost deafening amount of bass rumble and very un-natural.

Fingers crossed it is just some software based post-processing being done to enhance the bass frequencies and not a dodgy hardware choice.
 

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I tried recoding a movie in a

I tried recoding a movie in a working locomotive. We experience a lot of vibrations and rumbling. The Hero3 Silver camera's audio in this situation is all crackle. It was the same in the case or out in my hand - terrible!
 

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I am new here and also new to

I am new here and also new to GoPro. Went out to record some trail footage with it and have the cracking noise. Search on the web and found this forum.

I tried the various ways suggested and found that the noise goes away when I take the camera out of the case. Mind you I have only tried it with shaking it in my hand. Will need to go get the frame to try it with the car and see.
 

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Just watched your clips

I checked out the crackling in your clips and its my opinion that it is not interference from the engine systems.

I would expect the crackling to change pitch as the engine revs go up and down. It doesn't, its stays at a constant frequency no matter the engine revs. This would lead me to believe its inherent in the camera system. I reserve the right to be wrong however LOL

I did some tests myself in a very quiet bedroom at home. I tried 8 different combinations of resolution and fps (50, 48, 25 and 23.98fps) and noticed that the audio buzz I have been experiencing changed slightly between cases with 50fps being the worst and trending to diminish as I reduced fps with 23.98 and 25 being about the same.

Pity as I prefer to shoot at 50fps and then re-conform to 25fps later.
 

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