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Audio Pops On Fades
Hi all, in the process of mixing a film and it is causing me nothing but sleepless nights. I’m doing the mixing in FCP 5.0, on a quad 2.5 GHz G5. It has 8GB of Ram.
The film is 75 minutes long. At certain junctures when I put an audio transition down, the computer causes the footage to pop. I turned off two channels of audio (the main music channels) and the pop dissapears. I turn the channels back on and it reappears.
Also sometime I will put an audio transition between two bits of audio and even when I turn off the music channels on that part of the transition the music reappears for the duraton of the transition.
This is the first time I have mixed properly ( I know I should be using pro tools or fairlight or logic 7 but I don’t know these programmes and we have no money to pay anyone), it’s either me mix it or it doesn’t get done.
Anyone feel like chaperoning me through the final stages of this film, we are going to online it on to HDCam at some point. I’m literally making it up as I go along.
Your sincerely,
Jon
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6 Replies
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Was all your audio imported into your project with at the same bit/sample rate as your project? if your timeline is 16bit 48K be sure to converet all audio to 16bit 48K BEFORE importing it into your project. also FCP doesnt really like MP3’s,, be sure to converet any music/SFX to aiff format.
the music showing up where its not supposed to sounds like audio render files being refenced, you’ll need to re-render the cross-fade to get rid of that.
also try to keyframe the audio level down (just like opacity of video) instead of using the cross-fade effect to see if the pop continues. aswell,, check that the “for level” and “for playback” options of the render all selection are checked.
Colin McQuillan
Vancouver BC -
[Colin McQ] “upposed to sounds like audio render files being refenced, you’ll need to re-render the cross-fade to get rid of that.”
**referenced**
Colin McQuillan
Vancouver BC -
Colin thanks for the reply. When you say re-render do you mean, just CTRL+R the whole sequence?
Could the sheer volume of information on the timeline be causing the computer to make computational errors. I have 22 audio tracks (not all with continuous audio on them) on a 75 minute film?
Jon
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[Jon_Alpha] “When you say re-render do you mean, just CTRL+R the whole sequence?”
either alter the affected clip (ie: reduce by 1db then bring it back up 1db) or right click -> remove attributes. this will remove the clips links to any previous render files that are ‘ghosting’ your clip. then render the clip again.
[Jon_Alpha] “I have 22 audio tracks (not all with continuous audio on them) on a 75 minute film”
that’s quite a few tracks..
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I’ve had wierd things like this happen when I start using eight or more audio tracjs with a lot going on…filters, transitions, etc. Someimtes I ‘d get audio ‘artifacts’ where there is no audio on the timeline anymore. Guess it’s a bug or something, more prevalent in earlier versions of FCP than the 5.1.4 I’m using now. Check to see if audio is set ot ‘best’ wuality in your preferences/settings, but your best bet may be to do a mixdown, if all the aidio will hold during th emixdown. Or export AIFFS of 2 or three tracks, then the other ones, and comine it to four tracks (2 stereo tracks) for final playback. FCP really isn’t a good audio app and is still pretty limited in its breadth despite all the individual features.
Definitely trash your prefs and reopen, and get rid of old render files as well.
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It sounds to me like you may not have “mixed down” your audio. Go into the Sequence menu, select Render Only and then Mixdown.
John
Dual 2.5 G5 4 gigs RAM OS 10.4.8 QT7.1.3
Dual Cinema 23 Radeon 9800
FCP Studio 5 (FCP5.1.2, DVDSP4.1.1, Comp2.3, STP1.1, Motion 2.1.2)
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