Subject: Re: [linux-audio-user] How do you make an ogg?
From: Ross Vandegrift (ross_AT_willow.seitz.com)
Date: Sat Oct 12 2002 - 19:02:46 EEST
On Sat, Oct 12, 2002 at 04:58:00PM +0200, Frank Barknecht wrote:
> > [lconrad_AT_tuba renfaire]$ oggenc -v
> > OggEnc v0.8 (libvorbis rc2)
>
> oggenc 1.0 is out. You maybe should upgrade.
No maybes about it - Definately upgrade your libvorbis, libogg,
libao, and vorbis-tools packaes.
0.8 is so old, I don't think it supports the final bitstream standard.
Not to mention *huge* improvements in the quality of the encoder.
> > So my question is, is there a way to get the ogg file down closer to
> > the size of the mp3 file?
>
> You can encode ogg files in various ways:
>
> 1) Quality 0-10 (--quality)
>
> gives you a file with a variable bitrate. The actual filesize is a bit
> difficult to predict, but if you experiment, this is the preferred way
> of ogg-encoding.
The scale actually goes from -1 to 10. The reason for this is pretty
funny - people were complaining that -q 0 was too good!! And it's true!
Just for kicks try it at -q 0 and then look at the file size - it's
amazing.
The scale on the quality rating is really misleading. If you have
"golden ears" you'll want to use -q 6 because of some tricks the encoder
does at less than 6. If you have average to musician's ears, you'll
probably throughly enjoy -q 3.
I've got slightly above average hearing, from years of music. I encode
at -q 3, and actually seriously considered encoding my stuff at -q 1 for
the disk space savings.
> 3) Bitrate (--bitrate)
[snip]
Not only does this produce lower quality files, it tends to produce
*bigger* files, in my experience. It looks like Vorbis really needs to
go out of its way to honor your request for some fixed bitrate.
-- Ross Vandegrift ross_AT_willow.seitz.comA Pope has a Water Cannon. It is a Water Cannon. He fires Holy-Water from it. It is a Holy-Water Cannon. He Blesses it. It is a Holy Holy-Water Cannon. He Blesses the Hell out of it. It is a Wholly Holy Holy-Water Cannon. He has it pierced. It is a Holey Wholly Holy Holy-Water Cannon. Batman and Robin arrive. He shoots them.
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