Subject: RE: [linux-audio-user] How do you make an ogg?
From: Mark Knecht (markknecht_AT_attbi.com)
Date: Sat Oct 12 2002 - 16:57:12 EEST
Laura,
You might also ask how to get the mp3 file UP to the size of the ogg
file? ;-)
mp3 has a lot of options for compression, and it's very 'lossy' in the
sense that lots of information is gone after encoding. Many, if not most
default mp3 encoders will put a low pass filter in at about 16KHz, killing
the very high end, and you can choose to encode at different bit rates also.
In my experience with mp3, you actually can make very high quality mp3
encodings if you study all the options and do some listening to what they
do.
I have no experience with ogg encoders, but my guess would be that you
want to reduce bit rate first, if that's an option, and maybe try variable
bit rate encoding if it is supported. You will, however, certainly hear the
difference.
I'd encourage you to also look at a spectrum analyzer of some sort to
compare what is getting encoded and played back, just to see the difference
visually as well as using your ears.
Good luck,
Mark
-----Original Message-----
From: linux-audio-user-admin_AT_music.columbia.edu
[mailto:linux-audio-user-admin_AT_music.columbia.edu]On Behalf Of Laura
Conrad
Sent: Saturday, October 12, 2002 6:44 AM
To: linux-audio-user_AT_music.columbia.edu
Subject: [linux-audio-user] How do you make an ogg?
A technical but mostly non-linux friend was asking me about where Ogg
Vorbis is relative to MP3's, given the current status of MP3 encoding
software.
I did a quick test of making an ogg from a wav, and my naive version
produced:
[lconrad_AT_tuba renfaire]$ ls -l hercules*
-rw-rw-r-- 1 lconrad lconrad 4526080 Aug 18 14:14 hercules2.mp3
-rw-rw-r-- 1 lconrad lconrad 12220015 Sep 3 12:30 hercules2.ogg
-rw-rw-r-- 1 lconrad lconrad 49956104 Aug 18 14:09 hercules2.wav
I used ecasound to do the encoding, but what my ecasoundrc says it did
is:
ext-ogg-output-cmd = oggenc --raw -o %f
oggenc is:
[lconrad_AT_tuba renfaire]$ oggenc -v
OggEnc v0.8 (libvorbis rc2)
So my question is, is there a way to get the ogg file down closer to
the size of the mp3 file?
-- Laura (mailto:lconrad_AT_laymusic.org , http://www.laymusic.org/ ) (617) 661-8097 fax: (801) 365-6574 233 Broadway, Cambridge, MA 02139
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