Popping sound in edited clips

treborx

treborx

Member
Hello All,
I'm in the process of finishing a short shot with the DVX100a 24fps Advanced and edited using FCP. The whole production looks fantastic, but I'm running into a really annoying problem with some audio clips. After I drop a aiff. file into the timeline and use the razor tool to edit the needed clip and set it into place I get a popping noise at the beginning of the clip and at the end of it. I was able to get rid of some of these by back tracking a frame into the clip and setting the rubber band from 100% to 0. But on some clips I can't ged rid of this no matter what I do. To make a long story short, Before I edit with the razor tool the clip sound great, but as soon as I slice then I get the popping noise. I hope this makes sense.


Thanks In Advance!!
 
are you cutting in the middle of a waveform instead of silence perhaps? Sometimes that can lead to pops
 
Did this issue ever get resolved? I am having the same problem with popping in my AIFF files when I use the pen tool to lower the volume.
 
It looks like I fixed it . I converted my "popping" file to a 48khz and it seems to be working now. I will let you know if I keep having a problem.

BTW, I am on a 29.97fps sequence, not a 24.
 
There are two issues. The first is the head and tail clicks/pops that can happen because you are probably not cutting at a "zero crossing". Head and tail fades are the easiest way to fix that issue. Or you can go in and edit at the subframe and move the cut so the wave form is as close to the center line as poss.

The other issue is a periodic popping that happens if sample rates are off. It can happen if you have a digital in that is connected to something that isn't on (and thus not sending clock info). FCP does auto SR conversion so I would guess that it could also happen if you have your project set for one sample rate and have a digital in at another sample rate. Anyway it sounds like a very sharp pop every few seconds or so (depends on how far off the rates are).
 
My issue sounded more like the first one you mentioned. But once I changed my AIFF files from 44 to 48 they stopped popping. When you say a "head and tail fade", do you mean adding an audio fade effect?
 
I believe he's talking about where the sound wave croses the centerline. Moving upward from the centerline would be your head and then moving upward to the centerline would be the tail. Ideally, you would want to cut at one of these points (where it crosses the centerline). I believe you can adjust this point in Soundtrack Pro.

kylelewis1 said:
But once I changed my AIFF files from 44 to 48 they stopped popping.
Click to expand...
It's a common problem, especially if you're bringing in music from CDs since Audio CDs are 44khz.

EDIT: An Audio Crossfade tends to help as well as making a smooth transition (soundwise) from one audio clip to the next.
CLARIFICATION TO EDIT: As has been posted, you need to convert the 44 to 48 and not use the Audio Crossfade for this, just for matching (transitioning between) adjacent audio clips
 
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The popping results from when you try to put a 44.1 kHz audio file into a 48 kHz timeline. CD Audio is 44.1 kHz. Video is 48.0 kHz. You either have to adjust the timeline to cycle at the rate of 44.1 kHz to match the audio clips, or change the audio clips to run at 48.0 kHz.
 
Ha! I used to have QT Pro until QT 7 came out and took away my QT Pro rights. I used Itunes and it worked just fine thankfully.
 
Blaine said:
I believe he's talking about where the sound wave croses the centerline. Moving upward from the centerline would be your head and then moving upward to the centerline would be the tail. Ideally, you would want to cut at one of these points (where it crosses the centerline). I believe you can adjust this point in Soundtrack Pro.
Click to expand...


Actually I was talking about a Fade, but this may not be something easy to do in FCP. In Protools you just highlight a bunch of regions (clips) and hit fade and it will add head and tail fades that are about 10 milliseconds long to solve the popping. Head referred to the beginning of a clip and tail refers to the end of the clip.
 
Actually you can change the rate right in Final Cut Pro by using the Export Queue window, putting the tracks in there, changing their settings, and then exporting the new tracks to a destination of your choice.
 
Noiz2 said:
Actually I was talking about a Fade, but this may not be something easy to do in FCP. In Protools you just highlight a bunch of regions (clips) and hit fade and it will add head and tail fades that are about 10 milliseconds long to solve the popping. Head referred to the beginning of a clip and tail refers to the end of the clip.
Click to expand...

I don't think FCP does it that way. Or at least I don't do it that way in FCP. You either have to manually lower the opacity (in video) or sound level (in audio) or add a "fade effect" to the cliip.
 
Well that sort of sucks. Some programs have a snap to zero setting that will always try to adjust your edit to the closest zero crossing. This is the problem with using a picture editing program to edit sound. Better than trying to cut picture in Pro Tools...

SK
 
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