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You are talking about 2 different things here yosemite. --alt-preset 128 makes an ABR mp3 with average bitrate of 128.
If you want a MINIMUM frame size of 128 you need to specify that with a '-b 128' but obviously that won't work with an ABR 128.
Maybe what you want is a '--alt-preset standard' which will give you about 160-180 kbps for a movie soundtrack...and it uses '-b 128.'
You could also try something like --alt-preset 160 -b 128 to give more control over the final file size.
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