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11-14-2016, 04:13 PM   #1
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Video noise in absolute silence

Hi, I just bought my GR II after a lot of online research and I love it!
However, when watching a video that I took in complete silence I can hear a writing sound (in the recording). My best guess is that the camera recorded also the sound of the data being written to the SD card - I have played the video on my laptop just to make sure that it's not the sound from when it reads the video, just in case..

I have this card: SanDisk HD Video 20MB/s class 6 16GB.

Are there any suggested SD cards that make no sound when something is written on them or is my camera defect?

11-14-2016, 05:36 PM   #2
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Can you post a short example?

As the GR has no IS it won't be noise from that. Writing to flash memory makes no sound, you might be hearing the auto-gain amplifying the smallest/faintest sound the mic can actually pick up.
11-14-2016, 07:07 PM   #3
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There's almost always static when recording unfiltered audio so I'd be willing to bet that's it.

Also, that card may be too slow for video. It's certainly slower than what the GR can handle.

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11-14-2016, 10:15 PM   #4
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I'm not sure. I do know that that Sandisk card is really really slow. The GR supports UHS-I according to the manual, so that's a good troubleshooting step. My favourite cards are the 95MB/s Sandisk Extreme Pro cards. Even if the camera itself can't write to them at their max speed, a good card reader for your computer certainly can, and that makes processing a lot more fun, in my opinion.

11-14-2016, 10:54 PM   #5
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You recorded absolute silence, so the camera turned its microphone gain up. It's like turning up the volume of music, you get a background hiss.
11-15-2016, 12:13 AM   #6
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Are you sure the noise is actually on the audio track of the video? Can you demux the audio track and edit it in a digital sound editor and "see" the noise on the graphic display?

The sound card on my desktop PC once in awhile will pick up stray EMI (ElectroMagnetic Interference such as from the PC fan motors or drives) and RFI (Radio Frequency Interference like from my old GSM cellphone) and I can hear this interference when wearing headphones and no audio playing.

It is also possible the audio recorder on your camera is picking up stray EMI from say a refrigerator motor or power lines. Try recording "silence" in another location.
11-15-2016, 08:15 AM   #7
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Here's a video I just shot in my bathroom (the most silent room of the flat ).

I have to admit that I have to turn up the volume to the max on my mac to hear that "writing" sound, but when I play it on the camera I hear it very clearly even at lower volumes. To me it sounds like it's the data written to the SD card..

It's only a couple of seconds but it's 65mb, let's see if this link works.
R0000164 - Sendvid

What do you think, am I over reacting?
11-15-2016, 11:44 AM   #8
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QuoteOriginally posted by charliebigpot Quote
Here's a video I just shot in my bathroom (the most silent room of the flat ).

I have to admit that I have to turn up the volume to the max on my mac to hear that "writing" sound, but when I play it on the camera I hear it very clearly even at lower volumes. To me it sounds like it's the data written to the SD card..

It's only a couple of seconds but it's 65mb, let's see if this link works.
R0000164 - Sendvid

What do you think, am I over reacting?
Sorry about the pop-up when playing the video but I don't have a youtube account and this is the only site I found that would upload me the video in ok quality

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