Vorbis dev - Sep 2001 - Building vorbis-tools without libao

Hi All,

For my new file (and thus mp3) server I've decided to switch 
completely to Ogg Vorbis. This means having to reencode
~30GB worth of 128Kb MP3's, but i figured that it would all
be worth the effort. So I downloaded the sources for
libogg, libvorbis and vorbis-tools and fired up my trusty
old compiler. libogg and libvorbis built and installed
like a charm. Not so for vorbis-tools...

It seems that when building vorbis-tools libao is required.
It also seems, however, that the only vorbis-tool linking
with libao is ogg123 - the one tool I don't need on my
server (which has no soundcard anyway). I must be able to
encode to ogg (oggenc), change comments (vorbiscomment) and
list the info for these files (ogginfo). All of these are
not linked to libao :

$ ldd `which oggenc` `which ogginfo` `which vorbiscomment`
/usr/local/bin/oggenc:
        libvorbisenc.so.0 => /usr/lib/libvorbisenc.so.0 (0x4001d000)
        libvorbis.so.0 => /usr/lib/libvorbis.so.0 (0x400e1000)
        libm.so.6 => /lib/libm.so.6 (0x400fd000)
        libogg.so.0 => /usr/lib/libogg.so.0 (0x4011f000)
        libc.so.6 => /lib/libc.so.6 (0x40123000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
/usr/local/bin/ogginfo:
        libvorbisfile.so.0 => /usr/lib/libvorbisfile.so.0 (0x4001d000)
        libvorbis.so.0 => /usr/lib/libvorbis.so.0 (0x40023000)
        libm.so.6 => /lib/libm.so.6 (0x4003f000)
        libogg.so.0 => /usr/lib/libogg.so.0 (0x40061000)
        libc.so.6 => /lib/libc.so.6 (0x40065000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
/usr/local/bin/vorbiscomment:
        libvorbis.so.0 => /usr/lib/libvorbis.so.0 (0x4001d000)
        libm.so.6 => /lib/libm.so.6 (0x40039000)
        libogg.so.0 => /usr/lib/libogg.so.0 (0x4005b000)
        libc.so.6 => /lib/libc.so.6 (0x4005f000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)

Of course, I have no idea how to work around the configure
and makefile problems to build all but ogg123. Of course,
I could install libao or copy the tools I need from another
box but there's little challenge in such a solution ;)

Can anyone give me some pointers on how I should change the
source distribution to build without libao and ogg123 ?

Thanks !

Paul 'WEiRD' de Weerd

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>
>
>For my new file (and thus mp3) server I've decided to switch 
>completely to Ogg Vorbis. This means having to reencode
>~30GB worth of 128Kb MP3's, but i figured that it would all
>be worth the effort. 
>
Sorry, but it won't be worth the effort.  For a number of reasons, 
transcoding from MP3 to Ogg Vorbis is NOT a good thing.  The main reason 
being that your audio will end up sounding _worse_.  See other messages 
on this list for more info.

** To the vorbis.com site admins:  Perhaps someone should post a short 
article saying that this is bad, and all the reasons why it's bad. 
 Seems the average user doesn't get it, and therefore, to save ourselves 
some breath, we could just reference to the website.

As for you compiling questions, i'm sorry, i can't help you with that. 
 Though your motives are scewed, i think this is a valid question, and 
actually something i wondered when having fun compiling vorbis-tools for 
myself.  Some wise coder please tell us.

Jonathan

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On Mon, 3 Sep 2001, Paul de Weerd wrote:
> It seems that when building vorbis-tools libao is required.
> It also seems, however, that the only vorbis-tool linking
> with libao is ogg123 - the one tool I don't need on my
> server (which has no soundcard anyway). I must be able to
> encode to ogg (oggenc), change comments (vorbiscomment) and
> list the info for these files (ogginfo). All of these are
> not linked to libao :
Yes.  Libao is used to playback audio to sound devices.  The easiest thing to
do right now (as you point out) is to install libao, and then delete it and
ogg123.  However, if you really want to compile without libao, you'll have
to
do the following hack (which requires that you have the autoconf/automake
tools installed):

Edit configure.in and remove the line: 
   AM_PATH_AO(,AC_MSG_ERROR(libao needed!))

./autogen.sh

You will then have to cd into the dir for each tool you want to build and do
"make" and "make install".

I don't know if there is a strong need in general to compile some of the
tools, but not others.  If so, we can look into enabling the configure script
to selectively compile certain tools.


---
Stan Seibert

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