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Old April 18th, 2005, 07:03 AM   #1
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44.1 audio conversion

greetings -

I'm putting a music project shot on DV onto DVD.

The project is in 44.1k audio. I need to convert to 48k for the DVD, correct?

Not that I have any other choice, but does anyone know how this conversion will effect the audio quality? anything I can do to help the conversion work better?

My plan is to convert the audio at the same time I encode the video to Mpg2 - when I output the project from Premiere Pro.

Thanks for your help.

bob
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Old April 18th, 2005, 07:24 AM   #2
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If you shot this in DV it is far better to go the other way around, since DV
is 48 kHz as well!!!

So edit in the 48 kHz timeline and use that to export to DVD.

Then export to WAV/PCM seperately and use 44.1 kHz as the output form.
When I tried to do this in the Premiere 6 time it destorted the audio badly,
I have no idea how good the current version is.

If you have a dedicated audio program export to 48 kHz WAV and then let
that audio application do the resampling to 44.1.
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Old April 18th, 2005, 09:03 AM   #3
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the project is already edited in 44.1.

I've been told DVD audio needs to be 48k

I think I need to resample, and premiere is the only program I have that can do that, I think.

thanks.
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Old April 18th, 2005, 09:15 AM   #4
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As my post said, DVD audio needs to be 48 kHz indeed. So export to WAV
(or better yet AC3) and select 48 kHz as the samplerate.
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Old April 18th, 2005, 07:08 PM   #5
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Quote:
Originally Posted by Robert Bobson
the project is already edited in 44.1.
so far you have stated that you edited dv footage in premiere pro at 44.1khz... which doesn't make any sense, unless you imported non-dv audio from somewhere else... or, your premiere project settings are totally bogus, because it meant that your dv-sourced 48khz audio had to be re-sampled from it's original dv-format 48khz to the 44.1khz that you claim to have now.

if you still have the original dv footage on the hard drive, you need to correct your premiere pro project settings to where they should be.

if all else fails, doesn't premiere pro come with a newer version of cool edit pro?? which will do a killer job of changing the frequency of your audio... you might want to resample it from 16-bit(?) to 32-bit(?) audio, before doing the 44.1khz-to-48khz frequency change... see the help files for more info.

you should be able to do that within premiere pro, but the worst case is that you can export the entire audio-only track, make the frequency change, delete the premiere pro audio tracks, then import the new 48khz audio track into premiere... that way, it'll be all set up in the project, so you can author directly to the dvd.
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Old April 19th, 2005, 09:45 AM   #6
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Quote:
doesn't premiere pro come with a newer version of cool edit pro??
If he has the Adobe Video Collection then yes, he would have Adobe Audition.
Quote:
you might want to resample it from 16-bit(?) to 32-bit(?) audio, before doing the 44.1khz-to-48khz frequency change
Premiere Pro has already done that as it automatically converts all audio in a project to the project sample rate at 32-bits when it is imported.
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Old April 19th, 2005, 06:38 PM   #7
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shows what i know about premiere pro, lol... nice tip.

unfortunately, tho, that 32-bit internal processing of the audio won't help with his dvd creation problem, because there is no 32-bit audio spec for the dvd video format... i believe that 24-bit is as high as it goes... and he also still needs to get from that bastard 44khz frequency that he claims to have edited at, to the native dv/dvd 48khz.
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Old April 21st, 2005, 01:32 PM   #8
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You can use BeSweet to resample the audio. It is a freeware program for converting audio. BeLight is a easy to use GUI and is also freeware
http://dspguru.doom9.net/ is the link to BeSweet and http://corecodec.org/projects/belight/ is BeLight
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Old April 22nd, 2005, 06:57 AM   #9
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revision

I WAS in error with my original posting. My project is in 32K, not 44.1k.

The audio from the digital camera was at 32K, so I kept it the same in the project.

Does this change my options for resampling to 48K for the DVD?

Thanks ~

BB
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Old April 22nd, 2005, 07:14 AM   #10
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thanks

thanks for all your responses (and lack of attitude!)*

I've found the answer I was looking for.

Premiere will automatically "conform" 32K to 48K when you import it into a 48k project.

(And I dodge the bullet yet again!)

Bob




*this is sarcasm, DE! :)
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Old April 22nd, 2005, 08:07 AM   #11
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Robert, I highly recommend you change the sound settings on your DV camera to 48K before your next shoot. It will ensure you get the highest quality sound.
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Old April 22nd, 2005, 07:49 PM   #12
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bob, i knew that i had you busted somewhere with that 44.1 khz number! lol.

that premiere auto-conform(?) to 48 khz is interesting, i've learned a couple of things in this thread... just check your export settings.

you also really want dolby digital encoding of the audio, if you are going to be selling copies to people.
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