OGG Vorbis: Differences between Audacity and oggenc2

Audacity Help Forum Windows
1

Hello everyone.

I am user of windows 7, I use Audacity 2.0.5 which I downloaded in its zip version.

I have checked different ways to compress files into OGG and I have used Audacity, oggenc2 and MATLAB’s function ‘audiowrite’. I have found out that the results between Audacity and MATLAB’s ‘audiowrite’ are very similar (both number of samples and same amplitude but when miminum differences). Whereas when using oggenc2 the output contains 22 more samples and the amplitude is clearly different.

Any ideas about why? Thanks in advance.

2

Oggenc2 is not the official OGG encoder. As far as I know its main difference is that it can accept input from a wider range of lossless codecs and has better support for multi-channel input.

Audacity uses the official OGG reference encoder.

Audacity does not develop libvorbis or oggenc2. If you want to find out more about oggenc2 I suggest you look at its source code or contact its developer John33 via the Hydrogenaudio forums:
http://www.hydrogenaudio.org/forums/index.php?showtopic=47538 .


Gale

3



Which is the official OGG reference encoder then? What is its name? Where can I find more information about it? Can I download it?

Thanks in advance.

4

Xiph.org .

Please note, this is the Audacity Forum. :wink: You should be asking highly detailed questions about codecs elsewhere.


Gale

5

I couldn’t help but smile. “22 more samples” and we’re getting into very fine distinctions between reference codecs and reference implementations.
Side stepping slightly, the “official” (Ogg) Vorbis encoder by the Xiph.org Foundation (http://www.xiph.org/) is Oggenc and is is part of vorbis-tools.
Oggenc2 is an enhanced version of oggenc developed by John33.

Xiph.org and the the Hydrogenaudio forums will be the best sources for detailed information.