I’ve been playing round with getting good quality compressed speech.
Here’s what I’ve found.
1. SMALLEST FILE SIZE ACCEPTABLE QUALITY.
For very small file size (4MB for 20 minutes) and acceptable quality,
use the LAME encoder (the the separate article on Itunes songs to find out about the LAME encoder) with the following arguments in the ‘Encoding options’ Box:
-V 9 –vbr-new -mm -h -q 0
2. An even better option than above but slightly more complicated is:
Firstly convert the file to 22khz sample rate and mono, (eg in Audacity)
then use the following LAME settings:
-V 8 –vbr-new -h -q 0
3. BETTER QUALITY AND ACCEPTABLE FILE SIZE.
For about twice the size files (8MB for 20 minutes of speech) but very very good quality try this in LAME encoder:
–preset voice
OR
-V 8 –vbr-new -h -q 0
4. BEST QUALITY. Use itunes. Although LAME is better for music, and lower bitrate spoken word, itunes is great for 40kbps spoken word and above. CLick here to read about the best settings on importing spoken word into itunes here.
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