R/E/P Community

Please login or register.

Login with username, password and session length
Advanced search  

Pages: [1] 2  All   Go Down

Author Topic: 24bit to mp-3  (Read 5179 times)

eric broyhill

  • Newbie
  • *
  • Offline Offline
  • Posts: 8
24bit to mp-3
« on: November 01, 2006, 10:05:20 pm »

I have a new client that publishes music only on the internet.  I was wondering if anyone knows if there is a way to convert 24/96-88.2 ect. files directly to mp-3 and or the apple equivalent in one step. seems in theory it would sound a little better if it was compressed in one step rather than going to 16bit first, but I never tried it and don't even know if its supported.  would appreciate any insight   E
Logged

archtop

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 463
Re: 24bit to mp-3
« Reply #1 on: November 01, 2006, 11:01:45 pm »

I do it too, sounds fine, saves a step.
Logged
Richard Williams

archtop

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 463
Re: 24bit to mp-3
« Reply #2 on: November 01, 2006, 11:04:04 pm »

Sorry I missed the how part of your question.


just bounce at 24 bit no dither.

Import (add to library if using i-Tunes)

convert to mp3.
done deal
Logged
Richard Williams

eric broyhill

  • Newbie
  • *
  • Offline Offline
  • Posts: 8
Re: 24bit to mp-3
« Reply #3 on: November 02, 2006, 12:13:57 pm »

does i-tunes support higher sample rates as well? 96k..
Logged

minister

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1761
Re: 24bit to mp-3
« Reply #4 on: November 02, 2006, 01:02:27 pm »

mp3's do not operate at 96k, you must first SRC the file to 44.1 and then encode the MP3.

Audioease's BARBABATCH does an excellent job of this and will do it in (virtually) one step.  you put the 96k file into, then setup a conversion to MP3, in that conversion it will ask you to SRC to an acceptable rate for the codec.

the SRC in BB is excellent!!

http://audioease.com/Pages/BarbaBatch4/BarbaBatch4.html
Logged
tom hambleton C.A.S.
minister of fancy noises
ministry of fancy noises

IMDb

eric broyhill

  • Newbie
  • *
  • Offline Offline
  • Posts: 8
Re: 24bit to mp-3
« Reply #5 on: November 02, 2006, 01:46:59 pm »

thanks.  so i-tunes supports 24bit but not higher sample rates.  has anyone done a a/b comparison to see if the final compressed version sounds any better using a 24bit source as opposed to a 16bit source?
Logged

minister

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1761
Re: 24bit to mp-3
« Reply #6 on: November 02, 2006, 02:44:52 pm »

24 bit files have to be dithered to 16 bit for mp3 encoding.

Logged
tom hambleton C.A.S.
minister of fancy noises
ministry of fancy noises

IMDb

AndreasN

  • Full Member
  • ***
  • Offline Offline
  • Posts: 247
Re: 24bit to mp-3
« Reply #7 on: November 02, 2006, 04:56:50 pm »

Psychoacoustic coding can use any word length like 16 or 24. Most codecs today only reads 16, 24 is preferable. High bit rate coding have the potential to scan and render more than 16 bit of dynamic range in its in-/output data streams.
Logged

archtop

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 463
Re: 24bit to mp-3
« Reply #8 on: November 02, 2006, 05:58:17 pm »

minister wrote on Thu, 02 November 2006 11:44

24 bit files have to be dithered to 16 bit for mp3 encoding.




I don't. Works fine.
Logged
Richard Williams

minister

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1761
Re: 24bit to mp-3
« Reply #9 on: November 02, 2006, 06:38:45 pm »

AndreasN wrote on Thu, 02 November 2006 15:56

Psychoacoustic coding can use any word length like 16 or 24. Most codecs today only reads 16, 24 is preferable. High bit rate coding have the potential to scan and render more than 16 bit of dynamic range in its in-/output data streams.



that may be true, but all my encoders, PEAK and Barbabatch tell me that i have toconvert to 16 first -- and that is what they say in the manuals.  is becasue they are usung the LAME encoder?
Logged
tom hambleton C.A.S.
minister of fancy noises
ministry of fancy noises

IMDb

AndreasN

  • Full Member
  • ***
  • Offline Offline
  • Posts: 247
Re: 24bit to mp-3
« Reply #10 on: November 03, 2006, 11:35:41 am »

It's probably a restriction in your programs. LAME supports 24 bit fixed and 32 bit floating point.
Logged

hummer

  • Newbie
  • *
  • Offline Offline
  • Posts: 7
Re: 24bit to mp-3
« Reply #11 on: November 03, 2006, 04:51:08 pm »


whatever you do, don't import 24 bit files to iTunes and convert directly to MP3/AAC or the like...

oddly enough, i did an experiment about a week ago to find out how iTunes handles this... in short, it doesn't. (if you want to hear it, let me know) i had been doing it to make myself refs occasionally, and it seemed like a time-saver.

BUT, to my ears, it sounds like iTunes was truncating beyond the necessary 16bits. i don't know much about perceptual coding though... so maybe that's part of the nature of it...

anyway, i'm sure there are codecs (LAME, i see..) that can handle 24 bits appropriately, but iTunes CHEWS IT UP!

DITHER!
Logged

gatino

  • Full Member
  • ***
  • Offline Offline
  • Posts: 132
Re: 24bit to mp-3
« Reply #12 on: November 03, 2006, 05:37:35 pm »

can't you do this with audacity or am i missing something
Logged

Tomás Mulcahy

  • Full Member
  • ***
  • Offline Offline
  • Posts: 211
Re: 24bit to mp-3
« Reply #13 on: November 07, 2006, 04:41:12 am »

Yep, i-Tunes uses the Quicktime engine, which does not actually support 24 bit. It definitely sounds like truncation. The same issue crops up in Final Cut, which IMO is generally very poor at handling audio. Was it Bob Ludwig who said "Never turn your back on digital"?

I would trust BarbaBatch to do it properly. I never used the MP3 encoder, but the SRC is superb.

HansP

  • Full Member
  • ***
  • Offline Offline
  • Posts: 165
Re: 24bit to mp-3
« Reply #14 on: November 08, 2006, 08:15:43 am »

LAME does a good job, but you may have to tweak the parameters.
like HF roll-off f and transition width, else it would likely break at 16k.
bit rate (192k is popular for spreading on internet), subformats (VBR, CBR, joint stereo) and tweak choices are much more crucial than dithering.

your client might consider that some platforms allow distribution with more sophisticated formats like recent WMA, AAC, realaudio or quicktime.
at 128k they can be better than mp3.
Logged
Pages: [1] 2  All   Go Up