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Settings for mp3 encoding mono voice recordings?
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bobjester
Inactive
_ 		3. May 2002 @ 07:03 _ Link to this message    Send private message to this user   
Hi there,

Most advice for mp3 encoding relates to stereo music, I am hoping someone can help me by giving some suggestions for encoding plain voice recordings (seminars, talks etc.)

I hope to achieve quite small file sizes, recordings are done onto minidisc (not as good as CD quality), but I want the end result to be at least as good as a cassette tape copy.

I will try experimenting myself, but any tips from those more experienced than myself would be very much appreciated.

Thanks,
Bob
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cd-rw.org
Senior Member

4 product reviews
_ 		3. May 2002 @ 10:50 _ Link to this message    Send private message to this user   
How low bitrate do you want? MP3 as a format is not at it's best in ultra-low bitrates. You may want to check RealAudio, WMA, OGG etc. for that (I haven't tested these though).

"--alt-preset standard -mm -b80" should give you very nice quality and bitrates around 100kbps.

I tried "--alt-preset 64 -mm -b32" with music material, and it wasn't bad.
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bobjester
Inactive
_ 		3. May 2002 @ 13:37 _ Link to this message    Send private message to this user   
Thanks for the quick response!

Having a closer look at the lame docs I found
--preset voice (CBR 56kbps)
and I really am hoping to achieve something like 56kbps. I am yet to try this out, but considering frequent portions of silence in the recordings, using -v may prove benificial.

Also while searching the web I found this useful link
http://david.weekly.org/audio/speech.php3
Even his 48kbps mp3 sample sounds better quality than the original recordings I have, so it looks like I should end up with pretty small files :)

I'll post back the results of my testing for anyone that may be interested.

Cheers
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cd-rw.org
Senior Member

4 product reviews
_ 		3. May 2002 @ 23:36 _ Link to this message    Send private message to this user   
One problem of LAME is the amount of features and there even are some outdated ones like the "--preset voice". According to my knowledge it's very much out of date and does not take advantage of recent LAME improvements. Test it though and tell me what you think.

I wouldn't rely on David's website. Just test a few settings and choose the one that fits your ear.

I may come up with another suggestion for you to try..
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The old school is back. All hail the new http://BitBurners.com !
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cd-rw.org
Senior Member

4 product reviews
_ 		5. May 2002 @ 00:20 _ Link to this message    Send private message to this user   
Yes,

Just use "--alt-preset xx -mm" where XX is the desired bitrate. Should produce optimal results, but go ahead and test the voice option too - I just think that it hasn't been developed for a long time.
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The old school is back. All hail the new http://BitBurners.com !
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