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Audio clipping??

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Oscar Gotti
Audio clipping??
on Oct 15, 2014 at 11:18:10 pm

Hi Larry,

We recently received a title sequence from a GFX company, and the audio for this title sequence peaks at around 0db, with the red lights flashing every time it does so. It does not sound distorted.

I spoke to the producer and he says that it's nothing to worry about, as long as it just touches on the 0db and doesn't stay there too long...??

I am very confused by this..I was always told that red lights flashing is not good at all!??

Thanks

O


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Shane Ross
Re: Audio clipping??
on Oct 16, 2014 at 8:32:40 am

The audio should never peak at 0db...never go into the red. The highest it should really go is -6db. -3db is pushing it. 0db...you risk audio distortion. Broadcast TV specs call for audio to peak at -12db.

Shane
Little Frog Post
Read my blog, Little Frog in High Def


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Oscar Gotti
Re: Audio clipping??
on Oct 18, 2014 at 3:08:59 am

Even for digital? ie YouTube videos?


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John Fishback
Re: Audio clipping??
on Oct 19, 2014 at 3:43:22 pm

Especially for digital. Digital is unforgiving. Exceed 0db and it clips. And the clips are ugly. So your YT video could have bad audio if the level exceeds 0. So, it's good to be safe and lower the audio a little.

With analog audio it's less of an issue as exceeding 0 doesn't automatically clip and when it does it's less ugly than digital. I remember coming across a recording studio named In the Red. Seemed strange, but before noise reduction systems were available one way to control noise was to record hot so when the levels were lowered in a mix the noise was also reduced. Because analog was forgiving "in the red," this wasn't a crazy approach.

John

MacPro 8-core 2.8GHz, 16 GB RAM, OS 10.9.4, QT10.1, Kona 3, Dual Cinema 23, ATI Radeon HD 5870, 24" TV-Logic Monitor, ATTO ExpressSAS R380 RAID Adapter, PDE enclosure with 8-drive 6TB RAID 5
FCP-X 10.1.3, Motion 5.0.7, Compressor 4.0.7
FCS 3 (FCP 7.0.3, Motion 4.0.3, Comp 3.5.3, DVDSP 4.2.2, Color 1.5.3)

Pro Tools HD 10 w SYNC IO & 192 Digital I/O, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec DSP Monitors, Prima CDQ120 ISDN


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John Fishback
Re: Audio clipping??
on Oct 16, 2014 at 9:19:57 pm

If it doesn't sound distorted, pull down the gain so it peaks at -6 as Shane said and you should be ok.

John

MacPro 8-core 2.8GHz, 16 GB RAM, OS 10.9.4, QT10.1, Kona 3, Dual Cinema 23, ATI Radeon HD 5870, 24" TV-Logic Monitor, ATTO ExpressSAS R380 RAID Adapter, PDE enclosure with 8-drive 6TB RAID 5
FCP-X 10.1.3, Motion 5.0.7, Compressor 4.0.7
FCS 3 (FCP 7.0.3, Motion 4.0.3, Comp 3.5.3, DVDSP 4.2.2, Color 1.5.3)

Pro Tools HD 10 w SYNC IO & 192 Digital I/O, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec DSP Monitors, Prima CDQ120 ISDN


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Oscar Gotti
Re: Audio clipping??
on Oct 16, 2014 at 9:28:49 pm

Sorry John I'm not sure I understand.. You said if it doesn't sound distorted?

O


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John Fishback
Re: Audio clipping??
on Oct 16, 2014 at 10:15:53 pm

Right. By lowering the gain you guard against a problem in some other app that doesn't like a 0db hit. Exceeding 0db will usually cause distortion. The actual level may be below actual 0db. It could be FCPs meter is reading hot which is good for you. If you hear distortion, then iZotope's RX4 can de-clip the audio in many cases. It's terrific software.

John

MacPro 8-core 2.8GHz, 16 GB RAM, OS 10.9.4, QT10.1, Kona 3, Dual Cinema 23, ATI Radeon HD 5870, 24" TV-Logic Monitor, ATTO ExpressSAS R380 RAID Adapter, PDE enclosure with 8-drive 6TB RAID 5
FCP-X 10.1.3, Motion 5.0.7, Compressor 4.0.7
FCS 3 (FCP 7.0.3, Motion 4.0.3, Comp 3.5.3, DVDSP 4.2.2, Color 1.5.3)

Pro Tools HD 10 w SYNC IO & 192 Digital I/O, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec DSP Monitors, Prima CDQ120 ISDN


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