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 > Legacy Products > 003, Mbox 2, Digi 002, original Mbox, Digi 001 (Win)

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 11-05-2007, 04:47 PM
WATYF WATYF is offline
Member
 
Join Date: Jan 2003
Posts: 152
Default Bouncing in session first vs. bouncing straight to disk...

OK. A couple of friends of mine got some "official" Pro Tools training in New York some time back. One of the tid-bits of information that the instructor told them was that if your session is 48K (or above) you should always bounce your song into a stereo audio track (in the same session) and THEN bounce that track out at 44.1K. He said this was because if you bounce a 48K session straight out to 44.1, your plug-ins are "running" at 44.1 (the bounce sample rate) instead of 48 (the session sample rate).

So my friends took this to heart, and have been bouncing this way for some time... basically *doubling* their bounce time (once in the session and then again out to disk).

Anyway, I found out about their methodology a while ago and, as a computer nerd, it didn't make any sense to me, since I know that a sample rate conversion happens *after* the bounce (you have the option to Convert During Bounce or Convert After Bounce). What that means, in my little nerd brain, is that a temporary 48K WAV file is being created during the bounce, and then at the *end* of the bounce, it gets converted to 44.1K. So in that case, it doesn't make any sense that the plug-ins would be "running" at any sample rate other than 48K.

So I figured I'd test this out myself. I bounced 30 seconds of a 48K session various different ways. I bounced straight to 44.1 using Convert During Bounce... then straight to 44.1 using Convert After Bounce... then I bounced the song IN the session to a stereo audio track and directly converted that stereo track to 44.1... then I bounced IN the session to stereo track and bounced that stereo track out to 44.1

At that point, I had four different stereo files created four different ways... and every single file was the exact same size, down to the last byte. I then took all of them and brought them into a 44.1 session and then started inverting them and playing them in pairs. Every file that was inverted cancelled every other file out... which basically means that there is no difference, in even the slightest way, between any method of bouncing.


So my question is... has anyone else heard this "myth"... and why on earth is a certified Pro Tools instructor teaching people something that is such a HUGE waste of their productivity??


WATYF
Reply With Quote
  #2  
Old 11-06-2007, 07:26 AM
albee1952 albee1952 is offline
Member
 
Join Date: May 2004
Location: Norwich, CT
Posts: 36,887
Default Re: Bouncing in session first vs. bouncing straight to disk...

Well done on your personal experiment. I have to agree that it sounds like a big waste of time. I bounce using the Convert after Bounce choice as I assume it puts less load on the cpu and may avoid errors or a bounce that does not complete. As to your friends assertion that the plugins will run at 44.1K, I have doubts on this as I am betting that the sample rate conversion is the last thing to happen(at least using CONVERT AFTER BOUNCE).
__________________
Gigabyte X79/intel i7 3930K, 32GB RAM, HD/Native, 192 IO
https://www.facebook.com/search/top/...0sound%20works


The better I drink, the more I mix

BTW, my name is Dave, but most people call me.........................Dave
Reply With Quote
  #3  
Old 11-06-2007, 07:52 AM
timebandit timebandit is offline
Member
 
Join Date: Feb 2004
Posts: 167
Default Re: Bouncing in session first vs. bouncing straight to disk...

The only advantage I could see to that would be to have two copies of the mix - one at the higher sample rate and one at 44.1 for use on cd if desired.

I can't see how the plug-ins could run at a different sample rate than the session. PT won't even let you mix files with different sample rates.

It was a good idea to check it for yourself and not just take someone's word for it.

Tom
__________________
Tom Lynn
my music:
www.tomlynnmusic.com
other people's music:
www.headphonomenon.com
Reply With Quote
  #4  
Old 11-06-2007, 12:39 PM
3JDamon 3JDamon is offline
Member
 
Join Date: Aug 2003
Posts: 896
Default Re: Bouncing in session first vs. bouncing straight to disk.

The main advantage of bouncing in session is that it takes a little less CPU than BTD for some reason. When dealing with 48k files I leave them at 48k for mastering, or when not doing 3rd party mastering I wait until all the songs are done and have Batch Converter convert to 44.1, which has just as good anti-aliasing as the "tweak head" setting and I can set it to do all of them while I do something else. I don't know of any sonic benefits to bouncing in session.

Weird, two posts concerning Batch Converter in a row...
Reply With Quote
  #5  
Old 11-06-2007, 02:10 PM
timebandit timebandit is offline
Member
 
Join Date: Feb 2004
Posts: 167
Default Re: Bouncing in session first vs. bouncing straight to disk.

Quote:
Weird, two posts concerning Batch Converter in a row...

yeah, really! I hope you are getting a sales commission!
__________________
Tom Lynn
my music:
www.tomlynnmusic.com
other people's music:
www.headphonomenon.com
Reply With Quote
  #6  
Old 11-07-2007, 03:17 PM
The Weed's Avatar
The Weed The Weed is offline
Member
 
Join Date: Jul 2001
Location: Toronto, Ontario, Canada
Posts: 6,622
Default Re: Bouncing in session first vs. bouncing straight to disk.

3J,

Do you have a link to Batch Converter? When I Google it I get a lot more than one show up.

Thanks,
__________________
Take your projects to the next level with a
non-union national read at reasonable rates
Demos: brucehayward dot com
Source-Connect: brucehayward
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
Error Bouncing to Disk Line 329. PT10 session echosounds macOS 3 11-16-2011 06:18 AM
PT Session Tripping Out When Bouncing To Disk jjboogie 003, Mbox 2, Digi 002, original Mbox, Digi 001 (Mac) 4 10-09-2010 07:14 AM
Bouncing to Disk on Pro Tools LE 7.4 Closes Session?!? MitchM2006 003, Mbox 2, Digi 002, original Mbox, Digi 001 (Win) 1 07-06-2008 07:44 PM
Bouncing vari-speed session to disk!!!! chanman Pro Tools TDM Systems (Mac) 0 04-11-2005 12:47 PM
Bouncing To Disk jamiecer 003, Mbox 2, Digi 002, original Mbox, Digi 001 (Mac) 2 07-10-2001 02:40 PM


All times are GMT -7. The time now is 03:41 AM.


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