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|| SportsShooter.com: Member Message Board
Beachtek DXA 5D and audio hiss
Myung Chun, Photographer
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Los Angeles | CA | USA | Posted: 1:06 AM on 09.04.09 |
->> For anyone familiar with the Beachtek for the Canon 5DMkII. The audio exported from FCP sounds pretty clean. However, when it goes through the video encoder for the web, there's a very noticeable hiss.
Anyone have this problem? If so, how did you get rid of the hiss? I think it might have something to do with the "invisible" tone the Beachtek creates that disables the cameras AGC. |
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Patrick Murphy-Racey, Photographer
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Powell | TN | USA | Posted: 11:45 AM on 09.04.09 |
->> I have been editing the video first with the audio, then I strip the audio out of the video, import it into garage band, and then replace it back into the video. there are a ton of controls and filters you can use in GB to accomplish getting rid of the hiss... and, I'm pretty sure that hiss is coming from the camera and not the beachtec unit. If they only made one change to the replacement for the 5D, it would be the audio section of the camera. I would kill for two level controls on the body allowing for full manual control and a switch to go mono when using only one mic...
Many people are using stereo flash recorders to capture the audio and then they place it later, but I usually don't have time for that... hope this is helpful...
pm-r |
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Myung Chun, Photographer
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Los Angeles | CA | USA | Posted: 1:26 PM on 09.04.09 |
->> Thanks for the info Patrick.
What I eventually did was export the audio into Soundtrack Pro and ran it through a low pass filter, adjusting the frequency until, whatever hiss I detected, disappeared. The hiss was magnified only when it went through the web encoder. The raw output from FCP sounded pretty clean. Never had this kind of problem before.
I agree about the audio section of the 5D. I don't know if you're familiar with the Beachtek DXA 5D but it's designed for the 5D. It has L-R level controls, AGC disable, line-mic inputs, phantom power, ground 1 / ground 2 noise reduction and stereo-mono.
I was also using the Sennheiser MKE 400, hotshoe mic. I think I need to do some more tests with the Beachtek / mic combos to eliminate that hissing problem. |
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Jason Joseph, Photographer
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Dublin | OH | USA | Posted: 3:43 PM on 09.04.09 |
->> The tone that the Beachtek emits to disable AGC on the 5D is around 20k. So if you cut your EQ in FCP at 20k, you might see a difference. Although it doesn't sound like that is your problem. Its worth a shot though.
Also, if you haven't checked it out yet, visit www.cinima5D.com for a TON of info specifically regarding shooting video on the 5D and how to deal with some of the necessary work arounds required to make this camera work to its fullest. |
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Myung Chun, Photographer
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Los Angeles | CA | USA | Posted: 4:04 PM on 09.04.09 |
->> Joseph,
I tried that and didn't seem to make a difference. I cut the freq from 8k - 20k and no difference except the aural quality of speech. The low pass seemed to work.
Thanks for the 5D link. I will definitely check out that site. |
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David Harpe, Photographer
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Jason Joseph, Photographer
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Dublin | OH | USA | Posted: 10:22 AM on 09.05.09 |
->> Myung,
Like I said, it didn't sound like that was your problem. If the low frequencies are the problematic ones, then your issue may be associated with your mic and the gain structure associated with all of your level settings or your connections.
And, sorry about the misspelling of the link to Cinema 5D. |
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