Depends on the settings. The audio quality will definetly be worse but
for spoken material it may be acceptable. On MP3s there is sample rate
and bit depth. Bit depth changes how much dynamic range or the range of
loudness that can be recorded. CDs are 16-bit but you could drop an mp3
to 8-bit. The audiophiles would insist on 24-bit. The bit rate is how
many of these 8, 16 or 24 bit samples are made each second. Generally
more is better. CDs use 44k (thousand) samples per second but you can
get away with a lot less for spoken word. Of course the audiophiles
would want 192K sample rates but depending on your requirements 8K might
suffice. Generally the highest frequency you can record is half your
sample rate. With most people's hearing limited to 20KHz or less the 44K
sample rate of CDs is plenty high to capture the highest frequency
sound. Of course if you are recording dog whistles (23-54kHz) then
you'll need a higher sample rate :) Generally mp3s, unless you are doing
some kind of variable bit rate encoding, are the same data rate no
matter what source material you are encoding. If you do a 16-bit
recording at 22K samples per second then it's going to crank out 44K of
data per second.
CB
On 3/21/15 10:19 PM, David Chittenden wrote:
Incoding an MP3 file using MP3 will cause a larger file.
David Chittenden, MSc, MRCAA
Email: dchitten...@gmail.com
Mobile: +64 21 2288 288
Sent from my iPhone
On 22 Mar 2015, at 12:55, jeffrey greene <greenebo...@gmail.com> wrote:
Hi, The books are already in mp3, I just want to decrease the file size to save
hard drive space. Will your itunes process do this?
Thanks, Jeff
On Mar 21, 2015, at 7:33 PM, george b <gbma...@gmail.com> wrote:
It the audio book is in your iTunes just go to the list of books like the list
of songs. Then interact with the list and arrow donw to the book. Then do a
right click on the book, (v o shift m). in the menu that pops up errow down to
change to mp3 and hit enter and follow the prompts
-----Original Message-----
From: macvisionaries@googlegroups.com [mailto:macvisionaries@googlegroups.com]
On Behalf Of jeffrey greene
Sent: Saturday, March 21, 2015 16:20
To: macvisionaries@googlegroups.com
Subject: mp3 re-encoder
Hi, I’ve been looking for a program to re-encode mp3’s and reduce the size of
my audio books. I’ve been having no luck either on the web or mac app store.
Everybody recommends something called mp3 quality modifier but when I download
it its a windows program. Anybody have any suggestions? I downloaded 2 mp3
converter apps from the mac app store but they both shorten the playback time
of the converted file.
Thanks, Jeff
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