|>>>FromS Stansberry <khoe@...>
| Hi - I like Audacity. I want to record onto my hard drive 3 and 4
| hour long lectures and edit them. Any problem with the length of
| recordings? I am using an i-Mac OS X. T hanks,
No, if you have sufficient disk space and sufficient computer resources
(speed and memory).
I'd suggest recording in mono (Preferences > Audio I/O tab) and
in 16 bit format (Preferences > Quality > Default Sample format)
to keep down the file size. This will take up 300 MB space per hour.
If that is too much, dropping the default sample rate to 22 050 Hz
on the same Quality tab will reduce space needed to 150 MB per
hour. It should be fine for spoken word. Export to mp3 or ogg when
you have made the recording to keep its file size down.
You need at least 64 MB RAM and 300 MHz processor, ideally three
times those figures if you are making long recordings, but it depends
how many other programs are running while recording. Try to shut down
as many other programs as possible before beginning. Please read our
recording tips below.
* Close all other programs while recording. Be aware of background virus scanners and
other system tray programs. Norton, Sophos and other anti-virus products scan each file
as it is opened and closed by default. On a slow computer this scanning can affect
recording as it takes too long.
* Turn off "Auto-scroll while playing". This stops the display re-drawing as the
recording is made. Stopping this reduces the amount of processing the display uses,
freeing power for recording. This is set under File > Preferences on the Interface
* Zoom out to the whole length you will be recording
* Disable the recording level meter in Audacity Preferences > Interface as this
will conserve resources on a slower computer
* Make sure DMA mode is enabled for your hard drive - see
*Try to avoid interrupt sharing for your soundcard
* Update your hardware drivers to avoid conflicts and get better hardware
performance. Key targets are:
o Sound Card. This is also a common cause of crashes, especially during
o Video (Display) Card
o Hard Drive controller - This is especially important for RAID and other
high performance controllers.
Outbound message virus-free.
Tested on: 03/03/2006 00:46:36