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DustoneGT Calculating status...

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Crackling/Clicking Sound After Rendering

Apr 8, 2009 6:32 PM

I have Adobe Premiere Pro CS3 on Mac OS X 10.5 on a Macbook.

I have a Canon XH A1 camera and record voice and other audio using an iPod Nano with a stereo microphone, recording highest quality WAV file.

Once I get the audio all lined up with the video (usually requires speeding the audio up slightly to sync) everything looks great and sounds great in the preview. No noise at all in the audio...not in the original WAV file, in Premiere Pro or in the audio from the camera.

After going through Adobe Media Encoder, the MOV file I create has a clicking/crackling sound (kind of like old vinyl, but louder, quiet popping) any time the audio came from the iPod.

Settings are: Quicktime, H.264, 1280X720, quality at 100, 24 fps, AAC Audio @ 44khz.

The original WAV audio file is 16 bit, 1411 kbps, 44.100 khz stereo. Also no hissing, pops or crackles in an MP3 derived from the file in soundbooth.

I've seen a few threads where somebody else had a similar problem, but it was never resolved.

Any ideas?

1144 Views 18 Replies Latest reply: Pyramid Pyro, Sep 2, 2011 9:21 AM

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1. Eddie Lotter,

Apr 8, 2009 6:53 PM in reply to DustoneGT

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Welcome to the forums.

This often happens when the volumeis too high. Reduce the volume on the clip or the master volume.

Cheers
Eddie

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2. DustoneGT,

Apr 9, 2009 6:56 PM in reply to Eddie Lotter

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Reducing volume doesn't seem to help any.

I also looked at some other audio that didn't come from the iPod and that audio was louder and didn't have the weird clicking sound.

I took another recording from the iPod and it did the same thing in another project.

I am guessing that Adobe Media Encoder doesn't like the iPod's wav file. Anybody else experienced this?

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3. Curt Wrigley,

Apr 9, 2009 8:59 PM in reply to DustoneGT

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When you play the audio on the timeline do the master audio meters ever turn red?

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4. DustoneGT,

Apr 9, 2009 9:16 PM in reply to Curt Wrigley

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Not at all, I'm not getting any clipped peaks.

This is so bizarre.

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5. Curt Wrigley,

Apr 9, 2009 9:28 PM in reply to DustoneGT

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This may sounds silly, but have you confirned the source audio isnt crackely to begin with?

Edit; No; I see yousaid not in your first post.

So; educate me how you made the wav file with an ipod. The fact you had to alter the speed of the audio file makes my spider senses tingle.

For giggles convert the wav file with soe utility to an mp3 and see if that plays ok.

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6. DustoneGT,

Apr 9, 2009 9:34 PM in reply to Curt Wrigley

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I recorded it using a belkin tune talk stereo, taped up to a podium where somebody was speaking.

I've read elsewhere that the camera and iPod probably are using a different clock processor and wind up perceiving time just a hair differently. The audio has to be sped up to 100.04% to match up with the video.

Putting the audio out to an MP3 gives good clear audio without the crackling sound.

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7. Curt Wrigley,

Apr 9, 2009 9:46 PM in reply to DustoneGT

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DustoneGT wrote:

Putting the audio out to an MP3 gives good clear audio without the crackling sound.
Then we know its how the wav file is being made that is the problem. Since Im not familiar with the tools you are using to create the wav file, I dont think i can be much more assistance.

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8. Jim Simon,

Apr 10, 2009 7:39 AM in reply to DustoneGT

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The audio has to be sped up to 100.04% to match up with the video.

I have the same problem (and solution) when I record audio separately using an iKey device. But there are no issues with my exported sound.

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9. DustoneGT,

Apr 10, 2009 7:50 AM in reply to Curt Wrigley

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iTunes copies the audio from the iPod into the computer.

I'm going to try a couple things I thought of last night and see how they go and post results.

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10. DustoneGT,

Apr 10, 2009 11:52 AM in reply to DustoneGT

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I tried rendering the timeline (enter key) and it did the same thing, made the audio all crackly.

Project settings by default for HDV 1080p are 48khz for audio and my WAV file is 44.1khz, so I did a test and loaded the original WAV file in soundbooth and saved it as 48khz. Did the same thing.

Evidently the noise is being introduced when it goes from 44.1khz to 48khz during the rendering process.

Does anybody know of a way either to convert to 48khz without making the noise or preventing premiere pro from converting it?

I tried changing the project settings, but it doesn't allow me to change that setting for a project that already exists.

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11. Eddie Lotter,

Apr 10, 2009 12:59 PM in reply to DustoneGT

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I tried changing the project settings

See: FAQ:How do I change the project settings?

Cheers
Eddie

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12. Jim Simon,

Apr 10, 2009 4:28 PM in reply to DustoneGT

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Evidently the noise is being introduced when it goes from 44.1khz to 48khz during the rendering process.

That is certainly not normal. I can't think of any technical reason to explain it.

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13. carrdav,

May 19, 2009 10:02 AM in reply to Jim Simon

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I'm having the same issue. I was doing voice overs with a small micro recorder, saving to MP3 and when I pop these into PPro CS3 it sounds fine on the timeline but whatever it is rendered to gives me pops and clicks and hiss as that audio that was provided in the way of an MP3 file plays in thoutput file.

I'll investigate some of the things posted here and report back.

Very annoying<grin>.

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14. Dag Norum,

May 19, 2009 2:27 PM in reply to DustoneGT

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Jim wrote:
>"I can't think of any technical reason to explain it."

Oh, there are some technical reasons I can think of, but...

Practical test (sort of taken "out of the blue"):

Open the original sound file in for example SoundBooth. Apply a bandpass filter (high order) that preserves the sound of interest well. If voice, I would suggest 100Hz to 8kHz as a starter. Export to same as source (bits and. kHz), but if source is anything else than wave, select .wav as output.

Now import the "bandpassed" version into Premiere and see if the exports are getting the same Crackling/Clicking.

Dag

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15. .srw.,

Nov 10, 2009 3:24 PM in reply to DustoneGT

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The solution I used was importing my audio into Audition and running "auto click/pop eliminatior" on the clip. Then imported that audio clip in to Priemere and exchanged the original audio with the audio saved from Audition, and then relinked the video and audio. Worked great.

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16. TheRealQwertMan,

Jun 20, 2011 9:29 AM in reply to DustoneGT

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I had this problem for the first time too. I was able to eliminate it by removing my time stretch (my audio was at 100.1%). It seems that Premiere just sucks at time-stretching audio now. I suppose our solution is to use a different application to timestretch. or sync by chopping a few frames out here and there.

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17. Bill Hunt,

Jun 20, 2011 10:11 AM in reply to TheRealQwertMan

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I wonder if the introductions of the "clicks & pops" could be due to Cuts that are not on Zero Crossings in the Audio?

This ARTICLE goes into a bit more detail.

In Audition, one can limit their Cuts to Zero Crossings (not sure about SoundBooth?), but as PrPro is a Video editor (with almost everything geared for Video), that also does some Audio editing, I do not think it has such a limit, unless it's been added very recently.

Good luck, and hope that this helps someone in the future.

Hunt

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18. Pyramid Pyro,

Sep 2, 2011 9:21 AM in reply to TheRealQwertMan

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For me it was also time stretching of the audio file (a separate, non-video, WAV recorder). Even at 100.01% it introduced pops, ticks, clicks, etc.

I used Soundbooth to do the time adjustment then Premiere handled it fine from there.

Erik

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