GH2 An Audio Solution for Documentary/run'n'gun situations

mshakeshaft

Active member
One of the problems with all DSLR cameras used for video, is the limitations of audio capture. Whilst the Panasonic GH2 is better than most (it has an onboard stereo mics and VU meters), it still falls short in some areas. The biggest issue is that there is no headphone monitoring and level adjustment is crude, via the menu. Various solutions have been tried including recording separate sound using SD recorders, such as the Zoom H4N. This separate audio can then be synched in post production using software like Plural Eyes or natively in Apples FCPX. Whist this works fine it does take extra time. With some of the work I do, I dont have time for a lot of post production, so my goal was to find a quick solution, suitable for run'n'gun situations.


Initial tests showed that the audio circuitry of the GH2 wasn't too bad. At low levels the noise was acceptable, I decided to try a preamp. I tried a few different manufacturers. The main problem was that they were all too big. In most cases the form factor of the preamp was bigger than the camera. In a lot of cases this was because they used XLR connectors. Whist there are obviously many advantages to using these connectors in professional situations, for the type of work I was doing and with the type of microphones I was using, it was overkill. I found one preamp that used 3.5mm connectors, the Juicedlink DS214. This features preamps, headphone monitoring VU meters and AGC disable. The VU and AGC disable where both features I didn't need for the GH2. It has onboard VU meters and the AGC is redundant, using this setup.


My initial experiments were very encouraging. I could finally hear what was being picked up by the mic and with the switches on the front, fine tune my levels. Mounting the preamp was my only problem. at first I had everything in a waist bag, but it just meant there were wires everywhere. The mounting solutions offered by Juicedlink were also a not quite what I was after, so I decided to have something made. I approached a local engineering firm with some plans. They built the bracket in the picture for me. This mounts to the bottom of the camera, via the tripod screw, with a Manfrotto quick release plate on the botton. I use the Manfrotto 323 Adapter on all of my tripods and rigs.


This setup works great. For run'n'gun/documentary situations I use either a Rode Video Mic Pro, or a Sennheiser radio mic with a lav. My only change would be to have locking 3.5mm jacks on the Juicedlink, similar to the ones used by Sennheiser. I have just come back from a week covering the elections in Greece with this setup and the sound was excellent.


I have had a few people ask me about the setup and where I got the bracket from. I am toying with the idea of having some made up. There are a few little modifications I would make, such as including some accessory mounting holes, but basically it would be pretty much the same. If anyone has any questions or comments please feel free to post.

1gh2audio.jpg

3gh2audio.jpg
 
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Looks simple and sturdy. Does the JL offer separate gain control for two mic inputs?
Threaded 1/4 20 holes would be nice (you mentioned this) as well as having the metal anodized. What do you mean by "permanently" mounted?
 
Anodized is planned, this was my version for sorting everything out, making sure holes were in the right place!

'Permanently' was a bad choice of words. The bracket attaches to the tripod mount with a flush allen key bolt. I will change the wording.

Yes with a Y cable you can input and balance two mics seperately.

The battery door on the GH2 can be opened without detaching the bracket but you do have to undo the JuicedLink.
 
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Thanks for answering my questions. I think I would be interested in this bracket if the price is reasonable. From the pictures it looks like one wouldn't have to remove the JL from the bracket to replace the battery in the GH2, but I guess that isn't the case. Your work in Greece sounds like a lot of fun. Do you have any sample clips you can post?
 
I don't quite understand two things: With this setup you ignore the VU meters onscreen from the GH2 and use headphone monitoring?

Also, do you record two mics at the same time? How does the audio file look, is each mic audio on a channel (mic one on left channel and mic two on right channel)?

Thank you for sharing your setup.
 
One Question, since Iam thinking to buy maybe an external audio device in the future, doing video as a hobby:

* What about the Zoom H1 and using it as a microphone like i.e. Rode Video Mic ?

I love to film events sometimes aswell and its hard to capture the sound, i.e. if someone is playing an instrument. Sometimes i just let the camera run, but there are situations when you just move and the steps are recorded aswell. So I was thinking about an external audio recorder which, but a small one and saw pictures from the Zoom H1 used like a microphone on the DSLR but with the option to work independantly and mobile with this recorder.
 
I don't quite understand two things: With this setup you ignore the VU meters onscreen from the GH2 and use headphone monitoring?

Also, do you record two mics at the same time? How does the audio file look, is each mic audio on a channel (mic one on left channel and mic two on right channel)?

Thank you for sharing your setup.

No I ignore the VU meters on the DS214. The meters on the GH2 are what is important.

DS214_pub_01.jpg

The input to the DS214 is stereo, so if you plug one mic in you get mono on both channels or with a splitter cable, you get one mic right / one mic left, with separate volume on each. The three dials on the DS214 are headphone volume/right input/left input. The socket that has nothing plugged in, in my photograph is headphone monitor. The other two are input and out to camera.

DS214_pub_03.jpg

Images from Juicedlink site (I should stress I have no links with them).
 
Moxrox. You can use a Zoom H1 but you need to use the separate audio. I have tried running the audio out from the H1s headphone socket into the preamp (you can do this with some recorders). But the H1s headphone output is too noisy.

Woodcarver: I am editing the Greek video at the moment. I will post a link. You do have to remove the preamp from the bracket but not the bracket from the camera. It uses a plastic bolt so the preamp is isolated from the camera to eliminate hum. I have wondered about trying velcro.
 
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