Avid Pro Audio Community

Avid Pro Audio Community

How to Join & Post  •  Community Terms of Use  •  Help Us Help You

Knowledge Base Search  •  Community Search  •  Learn & Support


Avid Home Page

Go Back   Avid Pro Audio Community > Pro Tools Software > Tips & Tricks

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 08-26-2010, 07:23 PM
Kinh Kinh is offline
Member
 
Join Date: Apr 2009
Location: Perth, Western Australia
Posts: 374
Default Bouncing to disk and sample rates.

Hi, I usually bounch a 48 session at 176.4khz. I then convert the wave to
mp3 format. Just wanted to know if by reducing the sample rate when bounching to the same as the session, do I get better quality.DOes the 176.4 conversion make any difference considering this is the ideal format for CD not MP3?
Reply With Quote
  #2  
Old 08-26-2010, 09:14 PM
Top Jimmy's Avatar
Top Jimmy Top Jimmy is offline
Moderator
 
Join Date: Oct 2005
Location: Spokane, WA
Posts: 5,919
Default Re: Bouncing to disk and sample rates.

Quote:
Originally Posted by Kinh View Post
Hi, I usually bounch a 48 session at 176.4khz. I then convert the wave to
mp3 format. Just wanted to know if by reducing the sample rate when bounching to the same as the session, do I get better quality.DOes the 176.4 conversion make any difference considering this is the ideal format for CD not MP3?
If you're not going to pass around whatever it is you're smoking then don't expect anyone to be your friend.

I'm sorry for being a wise-arse.

CD quality is 44.1 not 176.4. Upsampling and then downsampling gains you no improvement over sample-rate converting directly to the appropriate rate. If you're concerned about SRC quality, then record at the rate that your end product is going to end up at.
__________________
James Cadwallader

Mac Studio, 64GB RAM, 1 TB SSD, Glyph 2TB USB3 HDD, OWC drive dock, Mac OS Monterey 12.6.8

Pro Tools Ultimate 2023.9, HD Native, Focusrite Red 8Pre

Presonus Faderport, Pro Tools | Control
Reply With Quote
  #3  
Old 08-27-2010, 06:39 AM
daeron80 daeron80 is offline
Member
 
Join Date: Apr 2005
Location: Orlando, Florida, USA
Posts: 4,106
Default Re: Bouncing to disk and sample rates.

If your end product is mp3 only, you'll get the best quality out of a 48 kHz session by bouncing down to 24-bit, 48 kHz WAV, and converting that directly to a 48 kHz mp3. The fewer conversion stages the better. If you're going to release on CD, as well, do a second bounce to 24-bit, 44.1 kHz; then dither that down to 16-bit. Open the 24-bit stereo file in a professional wave editor like BIAS Peak on Mac, or Wavelab on Windows (there are many others) and save it as a 16-bit with the appropriate dither type for your music. Or you can bounce to split stereo, open it in a Pro Tools 44.1 session, and bounce it down again with POWr dither (noise shaping 2 for most music). You never want to dither down to 16-bit prior to sample rate conversion, because it cuts the conversion resolution by a factor of 256.
__________________
David J. Finnamore

PT 2023.12 Ultimate | Clarett+ 8Pre | macOS 13.6.3 on a MacBook Pro M1 Max
PT 2023.12 | Saffire Pro 40 | Win10 latest, HP Z440 64GB
Reply With Quote
  #4  
Old 08-29-2010, 04:11 PM
barismanco123 barismanco123 is offline
Member
 
Join Date: Aug 2008
Location: Planet Gong
Posts: 474
Default Re: Bouncing to disk and sample rates.

Hi, Kinh

Redcording at 176.4kHz sample rate is acceptable as it's a multiple of your final destination sample rate.

Recording at 48Khz would not be wise as it is not a multiple of 44.1Khz, the final output. The number crunching does not work so well at the bouncing stage. Might as well just record at 44.1Khz

Mathematically speaking 176.4 is exactly 4 times 44.1Khz so there will be no problem for PT when boucing down, no lost numbers - personally I use 88.2Khz but each to their own.

As for the MP3 side of things you can use the Fraunhoffer which Digidesign endorses and works from within Pro Tools.

Choose a sample rate which mathematically correlates to your PT session.

When choosing sample rates for each session either record at the final outputs sample rate or at a direct multiple of that final output.

Read this

The bottom of the line is we can't really hear the difference between 192Khz and 44.1Khz etc etc but if you insist upon a higher sample rate at least make sure it divides into you final outputs sample rate as mathematically easy as possible.

Edit: I know this is not your question but just so you know, with bitdepth, use the highest you can, always. If you ever wanted to lower it, as an effect for example, you can do that on a file per file basis in PT.
__________________
PTLE8 with an Mbox 2, for now!
Reply With Quote
  #5  
Old 08-30-2010, 08:11 AM
daeron80 daeron80 is offline
Member
 
Join Date: Apr 2005
Location: Orlando, Florida, USA
Posts: 4,106
Default Re: Bouncing to disk and sample rates.

The even-multiple thing may have been true 15 years ago. But today, all sample rate converters up-sample to a rate that is evenly divisible by both 44.1 and 48 prior to down-sampling. So it makes no difference any more. The only real difference between 176.4 and 192 is that one can represent slightly higher frequencies than the other. Both will down-sample to 48 and 44.1 equally well.
__________________
David J. Finnamore

PT 2023.12 Ultimate | Clarett+ 8Pre | macOS 13.6.3 on a MacBook Pro M1 Max
PT 2023.12 | Saffire Pro 40 | Win10 latest, HP Z440 64GB
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Focusrite Saffire 56 Sample Rate Problems - Sample rates changing during start up finalcut Windows 12 02-20-2012 04:00 AM
Bouncing to disk problem...possibly sample rate?? MeAlien27 003, Mbox 2, Digi 002, original Mbox, Digi 001 (Win) 2 11-15-2003 05:17 PM
Session sample rates & Soft Sample Cell soundboy35 Pro Tools TDM Systems (Mac) 4 10-26-2003 06:11 PM
Comparing Bit-rates, Sample-rates, and convertors - Telling the difference? stoogee 003, Mbox 2, Digi 002, original Mbox, Digi 001 (Mac) 4 05-05-2003 08:36 AM
bounce to disk sample rates pseudonym 003, Mbox 2, Digi 002, original Mbox, Digi 001 (Mac) 2 04-03-2003 03:10 AM


All times are GMT -7. The time now is 08:36 AM.


Powered by: vBulletin, Copyright ©2000 - 2008, Jelsoft Enterprises Limited. Forum Hosted By: URLJet.com