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Under Suse 10.1, normalizing an mp3 with Frequency setting of 48000 Hz result sin an immediate abort with the message "Segmentation Error".
Resampling the file from 48000 Hz to 44100 Hz seemed to fix the problem.
I used the lame command as follows:
lame --resample 44.1 -b 256 infile.mp3 outfile.mp3