[LBo] Looking for an application to bulk convert mp3 to ogg

[Anita Lewis]

On 05/23/2007 05:24 AM Billy Pollifrone wrote:
> Anita Lewis wrote:
>> On 05/22/2007 01:50 AM David Roseman wrote:
>>> Hi,
>>> Dave
>> Converting from on lossy format to another is not the best idea.  See
>> the FAQ at vorbis.com: http://www.vorbis.com/faq/#transcode
> =

> =

> Unless you're trying to preserve studio quality audio (which you
> wouldn't be using lossy audio in the first place) it'll come out okay.
> We could say the same thing about a JPG.
> =

> Set the amount of loss by the command line switch in the converter to a
> minimal setting... all of the tone deaf people out there wouldn't notice
> a big difference. ;-)
> =


It is not the same thing as converting to jpg.  It would be like
converting to jpg and then converting the jpg to another format which
loses more definition.

The link I gave is from Vorbis which is where the ogg format comes from.
 I'll quote it entirely so that you see what I am saying. The big point
is that both mp3 and ogg throw away part of the audio, *but* it is
*different* parts.  So mp3 has lost some audio and then you run it
through the ogg codecs and lose *still more*.  Unless you cannot play
mp3 on your player, why degrade the audio even further.

If you have the original wav, then it makes great sense to convert to
ogg. I realize that "tone deaf" people would not notice, but the point
is still valid, especially if the people at Vorbis are putting it in
their FAQ.

I don't want to be argumentative, but I do want to get the point across.

Anita

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"Can I convert my MP3 collection to the Ogg Vorbis format?

    You can convert any audio format to Ogg Vorbis. However, converting
from one lossy format, like MP3, to another lossy format, like Vorbis,
is generally a bad idea. Both MP3 and Vorbis encoders achieve high
compression ratios by throwing away parts of the audio waveform that you
probably won't hear. However, the MP3 and Vorbis codecs are very
different, so they each will throw away different parts of the audio,
although there certainly is some overlap. Converting a MP3 to Vorbis
involves decoding the MP3 file back to an uncompressed format, like WAV,
and recompressing it using the Ogg Vorbis encoder. The decoded MP3 will
be missing the parts of the original audio that the MP3 encoder chose to
discard. The Ogg Vorbis encoder will then discard other audio components
when it compresses the data. At best, the result will be an Ogg file
that sounds the same as your original MP3, but it is most likely that
the resulting file will sound worse than your original MP3. In no case
will you get a file that sounds better than the original MP3.

    Since many music players can play both MP3 and Ogg files, there is
no reason that you should have to switch all of your files to one format
or the other. If you like Ogg Vorbis, then we would encourage you to use
it when you encode from original, lossless audio sources (like CDs).
When encoding from originals, you will find that you can make Ogg files
that are smaller or of better quality (or both) than your MP3s.

    (If you must absolutely must convert from MP3 to Ogg, there are
several conversion scripts available on Freshmeat .)"

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