Jump to content

About to buy a GH4 but... but how bad is this noise problem?


Recommended Posts

Hi there,


I've got my pennies together and I'm going to pick up a GH4 next week, and I even bought the EOSHD shooters guide.


Problem... This GH4 audio buzzing I keep hearing about. How bad is it really?


Lets say I bought a juice box to have with my GH4, and I was using it to record sound from radio mics from interviews/atmos though my GH4.


Are my interview audio going to be ruined? Is it that noticeable or is it a tiny little sound issue?


I'm going to be using my camera for short films but also for filming documentary work, and I don't want to have to use a separate recorder and then sync in Avid.


I need to know that the sound is going to be ok, if I end up making a feature documentary but need to go back to the original rushes from when I was starting out I need to know I can go back and the audio will be useable.


Anyone have any experience of this?


Any one have any examples of it that you can hear on footage of someone talking?

Link to post
Share on other sites

I did some rough recording with a Sony PCM-M10 line out into the mic in. Since the Sony outputs a line level signal, I had to turn the mic gain on the GH4 by -8dB. It seems like there is no buzz but the noise floor is higher than direct to recorder. I will try a few more settings and post a comparison.

Link to post
Share on other sites

Ok. Here is my finding. Even with mic level -12dB, the GH4 mic preamp self-noise is still audible. So that's noise that must be removed in post. Since it's pretty much white noise, any decent noise removal tool should do be able to remove it. As for the buzz, the kind that people complained about, I couldn't replicate it.

Link to post
Share on other sites

The GH4 appears to have an AGC, even with the Limiter set to off. This example show's what the buzz sounds like with a very quiet input (I found the same results + analyzed in Audition. The buzz is over 2x the amplitude of the noise floor and is a triangle wave):

Link to post
Share on other sites

Audio is the least of my worries, there's already several work arounds. Such as setting the internal mic to -12db, when using an external mic. Using lav systems, pre-amp setup like a juicelink/beachtek, or simply using an external/separate recording setup like a zoom h4n, tascam etc.


I personally use my Beachtek Premp with an Audio Technica XLR mic without issues. I never really use the internal mic, unless I have no other options. But I typically use the internal mic as a reference guide and not much for anything else.



Link to post
Share on other sites

I would love to hear some audio where someone either didn't boost it so we could hear it better, and also didn't clean it up so we can hear it at all.


How does the noise compare to other cameras (Blackmagic excluded, of course :) ) ?



Link to post
Share on other sites

sorry i have to take back what i said, or at least be a little more specific. today i filmed a talk at my university and really only used the Video Mic Go as a back up and easier syncing. At higher gains the clicky buzz noize is definately there.


so stay in the negative gain area and you should be fine, everything around zero to +6dB is annoying as sh*t.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Similar Content

    • By petertom
      Panasonic AU-EVA1 5.7K Super 35mm WITH 3x13,200mAh Batteries and 2 Memory cards On Ebay
      Price: $3,100.00

    • By Richard Peretti
      Hi guys,
      Found this packed away in the loft. Haven't used it in years. Open to offers, UK only please.

    • By MurtlandPhoto
      The camera is in excellent condition without any marks. It comes in its original box with all original accessories including battery, charger, sync cable, strap, manual, etc. The 8Sinn cage is wonderful- it fits the camera like a glove and gives it plenty of mounting points for accessories. Price includes insured shipping to anywhere in continental U.S. via USPS Priority Mail. 

      Payment using Paypal or Cash App.
      Located in Ithaca, NY.

    • By zoombeam
      The original SLR 12mm for micro four thirds.  Built in hood.  Mint.  Box is intact.  Comes with original caps and hood.  $300.00+ shipping.
    • By Ingerson
      Well, it’s been 8 months since I completed this and almost a year since I promised @mercer to post it once completed

      I don’t really know what to say about this, it’s my first short and I wanted to try this medium after trying music, photography, drawing/painting and all sorts of writing in order to figure out myself and my depression.

      It took me months to complete due to my mental state and lack of energy and I intended to post this sooner, but life can be a little too much sometimes. Or very often in my case.

      Even though it was the hardest creative thing I’ve done in my life, (despite having a background or experience in most of the separate artforms that make up a film) I was really lost in the entire process and I developed love/hate relationship to it. I wanted to quit all the time when I wrote it, when prepping, when shooting and during the long, motivational drainage that is editing.

      But I guess that’s also where the love was born. No matter all the mistakes I made, I could somehow save it and make a decent first short thanks to the editing by re-arranging the pieces I had. Throw away most of it, stretching what was left of it, slowing or speeding up some of it, playing some of it in reverse. Dubbing in new sound (needed, cause most of it was unusable. Note to self: Don’t forget sound!

      I’ve tried to make another short since, but haven’t completed the shoot. I don’t know if I’ll finish that one, it’s just a silly comedy I made with my then girlfriend, now fiancée on my phone (This one was shot on the DVX200 before anyone asks, cameras are important on this forum apperantly, hehe) because she wanted me to make something less depressing, but I guess I’m just a gloomy guy, all my new ideas are based on my different malfunctions.

      Hopefully I’ll work up enough energy to make another, I really want to.

      Anyway, enough talking. I hope you’ll give this a go and give me some pointers, but go easy on me, okay?

      Now, pick you poison:


  • Create New...