Subject: Re: [linux-audio-user] How do you make an ogg?
From: jordan muscott (jordan_AT_no-future.com)
Date: Sat Oct 12 2002 - 17:17:00 EEST
On 12 Oct 2002 09:44:28 -0400
Laura Conrad <lconrad_AT_laymusic.org> wrote:
>
>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?
>
Hi Laura,
What might give you a better comparison would be to look at the bit
rates that the mp3/oggs are encoded at. Im not sure on the exact figures
for relative file sizes of mp3s/oggs, but you should definately be able
to get a 'good' sounding ogg that has a smaller file size than that.
for example, here is a comparison of an ogg and an mp3 on my box:
-rw-rw-r-- 1 jordan jordan 5358446 Apr 22 15:08 parse_error.mp3
-rw-rw-r-- 1 jordan jordan 3630351 May 1 13:31 parse_error.ogg
here, i have encoded the mp3 at 192 kBits, 44.1 kHz, Stereo, whilst the
ogg is 128 kBits, 44.1 kHz, Stereo.
I haven't used ecasound to produce oggs, but it looks likes it makes use
of oggenc , which is what i used. You can use the -b option to oggenc to
set the bitrate of the ogg you are producing, so lets say you had a wav
called music.wav, you could do something like:
oggenc -b 120 music.wav
which would encode you an ogg called music.ogg at 120kBits.
hope this helps.
jordan.
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