HTML and CSS Reference
video, with just audio, the user will primarily be focused on listening to your
audio, so the quality of the audio is of the utmost importance. This means that
more care must be taken to ensure that each track is transcoded and
compressed in the right way.
A lot of trial and error will be required, but depending on the type of audio you
wish to transcode, you can begin to build presets within Audacity. For instance,
you will use different settings for audio content only containing voice, such as an
audiobook, as compared to audio content containing a music track. The number
of frequencies that you hear from a human voice is much narrower than what
you might hear from a rock band, for example. This means that the file size for
an audiobook may potentially be smaller than that of a music track using lossy
NOTE: There are two types of compression types: lossless and lossy.
Lossless compression tries to encode the audio in such a way that it
has a smaller file size when encoded, but when it is decoded it will still
be the same as it was prior to compression. Lossy compression will
analyze the audio content and remove parts of it that might not be
audible. This means that with lossy compression, you will lose
information regardless of the decompression technique.
Encoding Audio with Audacity
Encoding audio with Audacity can be a simple process. For the sake of this
example, you will need to download an uncompressed audio file, so head over
any music track you like and ensure that the following options are selected, as
shown in Figure 3-18.
An uncompressed file
Track should be: Downloadable
Search only for Creative Commons licensed tracks
They should be: Free to use commercially