Painfully loud static noise at random at DVinfo.net

Aric Mannion · March 26th, 2011, 06:37 PM

I put a Delay filter on some audio. Ever since then FCP blasts painfully loud static noise randomly while the timeline is in playback. I know that it is random because it doesn't come from the same place twice. This is FCP 7.0.3 on a Mac Pro OSX 10.6.6

I trashed the prefs and hid the layer that has the audio delay filter. I turned the computer volume as low as possible, and tried speakers as well as headphones. It still makes a terrible noise at random.

Next I'm going to try to get rid of the clip with the filter completely, but I'm taking a break because the noise is so loud it hurts my ears. Any thought on avoiding this? I should record it, because it's pretty terrible.

Robert Lane · March 27th, 2011, 08:56 PM

This sounds like a hardware/rendering issue. Is the original audio track with the delay filter in the standard 48khz AIF/ACA format that FCP likes, or is it a WAV/MP3 or something else that requires pre-rendering? That might hold the key.

But, if the original audio file is in the correct format AND plays normally without the filter being applied it could very well be that there's a hardware issue - main-board specifically - when it tries to render core audio components.

Try playing the original audio track in QT standalone player first. Use the AV Controls window and play with the playback speed. If you get the horrible noise when you force QT to either slow down or ramp up the speed then it's a hardware rendering issue. If not, there's something else amiss.

Let us know.

Jordan Hooper · March 28th, 2011, 10:45 AM

This also happened to me, but only once, and I never found out why.
Scared the heck out of me.
Same version specs as you on my 2010 Mac Pro.

Robert Lane · March 28th, 2011, 03:41 PM

Mac Pro's have had a somewhat glitchy history with audio codecs and Apple Core Audio components, which Apple addressed in Firmware updates for specific machines. At worst, some machines had their main-boards replaced under warranty because Apple couldn't find a software solution.

I'd like to see what happens after Aric applies the troubleshooting I suggested - so keep us updated, Aric!

Nate Haustein · March 31st, 2011, 04:16 AM

This happens to every member of my team on every type of Mac with every version of FCP. It happens at random and without any filters or advanced techniques being applied. It scares me so bad when it happens.

Brandon Barnard · March 31st, 2011, 12:20 PM

Same here, got me while I was up at like 3am editing. Scared me to death. Happens every so often.

Aric Mannion · April 3rd, 2011, 04:14 PM

I've copied all the clips in the timeline and pasted it into a new timeline, leaving out the clip with the audio filter. This has given me a clean slate, and I haven't heard the sound since. I'm just going to never use an audio filter again in FCP, I'll leave that up to the sound guy. I was using an aif by the way, because I've noticed when I use an mp3 in FCP I hear a bit of static.

Also, when there is no sound coming from this computer, I can hear like a beep or hissing sound, which completely goes away anytime music or sounds begin playing. I don't know what's up that.

Robert Lane · April 3rd, 2011, 08:38 PM

Aric,

That beep or hissing is called "floor noise" and is most likely nearby RF interference caused by FireWire/USB drives that are connected to your system or other devices that naturally cause electronic noise when they operate.

If you are pushing out audio to your speakers from the 1/8"-inch stereo mini plug then you'll be susceptible to all kinds of RF in your audio. However if you use a USB or FW audio interface (there are about 2 dozen to choose from) to go out to a mixer or directly to your speakers this will eliminate that problem.

And for what it's worth FCP does NOT handle audio plug-ins very well; Soundtrack Pro seems to have mixed success from various users however it's been my experience that any audio tweaking/sweetening should be done externally from FCP and in a dedicated audio editor such as Peak, Deck, Audition, Logic etc.

March 26th, 2011, 06:37 PM	#1
Aric Mannion Major Player Join Date: Apr 2006 Location: Boston, Massachusetts Posts: 616	Painfully loud static noise at random I put a Delay filter on some audio. Ever since then FCP blasts painfully loud static noise randomly while the timeline is in playback. I know that it is random because it doesn't come from the same place twice. This is FCP 7.0.3 on a Mac Pro OSX 10.6.6 I trashed the prefs and hid the layer that has the audio delay filter. I turned the computer volume as low as possible, and tried speakers as well as headphones. It still makes a terrible noise at random. Next I'm going to try to get rid of the clip with the filter completely, but I'm taking a break because the noise is so loud it hurts my ears. Any thought on avoiding this? I should record it, because it's pretty terrible.

March 27th, 2011, 08:56 PM	#2
Robert Lane Go Go Godzilla Join Date: Nov 2004 Location: Scottsdale, AZ USA Posts: 2,825 Images: 15	Re: Painfully loud static noise at random This sounds like a hardware/rendering issue. Is the original audio track with the delay filter in the standard 48khz AIF/ACA format that FCP likes, or is it a WAV/MP3 or something else that requires pre-rendering? That might hold the key. But, if the original audio file is in the correct format AND plays normally without the filter being applied it could very well be that there's a hardware issue - main-board specifically - when it tries to render core audio components. Try playing the original audio track in QT standalone player first. Use the AV Controls window and play with the playback speed. If you get the horrible noise when you force QT to either slow down or ramp up the speed then it's a hardware rendering issue. If not, there's something else amiss. Let us know.

March 28th, 2011, 10:45 AM	#3
Jordan Hooper Regular Crew Join Date: Jul 2010 Location: Vernon, BC. Canada Posts: 111	Re: Painfully loud static noise at random This also happened to me, but only once, and I never found out why. Scared the heck out of me. Same version specs as you on my 2010 Mac Pro.

March 28th, 2011, 03:41 PM	#4
Robert Lane Go Go Godzilla Join Date: Nov 2004 Location: Scottsdale, AZ USA Posts: 2,825 Images: 15	Re: Painfully loud static noise at random Mac Pro's have had a somewhat glitchy history with audio codecs and Apple Core Audio components, which Apple addressed in Firmware updates for specific machines. At worst, some machines had their main-boards replaced under warranty because Apple couldn't find a software solution. I'd like to see what happens after Aric applies the troubleshooting I suggested - so keep us updated, Aric!

March 31st, 2011, 04:16 AM	#5
Nate Haustein Trustee Join Date: May 2007 Location: Minneapolis, MN Posts: 1,313	Re: Painfully loud static noise at random This happens to every member of my team on every type of Mac with every version of FCP. It happens at random and without any filters or advanced techniques being applied. It scares me so bad when it happens. __________________ Nate Haustein PXW-FX9 / FCPX www.flightcreativemedia.com

March 31st, 2011, 12:20 PM	#6
Brandon Barnard Regular Crew Join Date: Jun 2010 Location: Phoenix, AZ Posts: 120	Re: Painfully loud static noise at random Same here, got me while I was up at like 3am editing. Scared me to death. Happens every so often.

April 3rd, 2011, 04:14 PM	#7
Aric Mannion Major Player Join Date: Apr 2006 Location: Boston, Massachusetts Posts: 616	Re: Painfully loud static noise at random I've copied all the clips in the timeline and pasted it into a new timeline, leaving out the clip with the audio filter. This has given me a clean slate, and I haven't heard the sound since. I'm just going to never use an audio filter again in FCP, I'll leave that up to the sound guy. I was using an aif by the way, because I've noticed when I use an mp3 in FCP I hear a bit of static. Also, when there is no sound coming from this computer, I can hear like a beep or hissing sound, which completely goes away anytime music or sounds begin playing. I don't know what's up that.

April 3rd, 2011, 08:38 PM	#8
Robert Lane Go Go Godzilla Join Date: Nov 2004 Location: Scottsdale, AZ USA Posts: 2,825 Images: 15	Re: Painfully loud static noise at random Aric, That beep or hissing is called "floor noise" and is most likely nearby RF interference caused by FireWire/USB drives that are connected to your system or other devices that naturally cause electronic noise when they operate. If you are pushing out audio to your speakers from the 1/8"-inch stereo mini plug then you'll be susceptible to all kinds of RF in your audio. However if you use a USB or FW audio interface (there are about 2 dozen to choose from) to go out to a mixer or directly to your speakers this will eliminate that problem. And for what it's worth FCP does NOT handle audio plug-ins very well; Soundtrack Pro seems to have mixed success from various users however it's been my experience that any audio tweaking/sweetening should be done externally from FCP and in a dedicated audio editor such as Peak, Deck, Audition, Logic etc.