I pulled some audio off a cassette tape with the intention of making it into
mp3s. It's mostly speaking (no background music, etc.). For some reason,
encoding on these files is taking a *very* long time. On the order of 10x
longer than other files. Using the "play/CPU" number as a benchmark (not a
very good one, but close enough when the difference is this big) here are
some numbers ("normal" is a file pulled from a CD, "tape" is the file from a
tape):
normal with 'lame -m s -h -v -V 5': 0.7
tape with 'lame -m s -h -v -V 5': -0.06 (approx 52 minutes for a 1:15 file)
normal with 'lame -m s -h': 1.37
tape with 'lame -m s -h': -0.17 (approx 16 minutes)
normal with 'lame': 1.9
tape with 'lame': -0.19 (approx 15 minutes)
These numbers are with lame3.63 under Linux 2.3.99-pre2 on an AMD K6-2 500
(running at 400 because my mobo doesn't support it at 500). I got similar
numbers with 3.67 (I originally thought this was caused by a bug introduced
in 3.67 so I rolled back, but obviously it's something about the files).
Any ideas what would cause this performance?
sean
--
Sean Harding [EMAIL PROTECTED] |"Don't spread discontent, don't
http://www.dogcow.org/sean/ | spread the lies."
| --Natalie Merchant
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