Re: MP3 resampling
On 09.08.06 16:41, Marc Shapiro wrote:
> I have some .mp3 files that I would like to resample to a lower bitrate
> to take up less space.
That's true, I did it already and got the expected result.
> from what I have read, I should be able to do
> this with lame with a cmdline of:
>
> lame -abr56 infile.mp3 outfile.mp3
I think it should be "--abr 56", this way you resample to mono, instructing
lame it's raw PCM file.
> which would resample the output to an average bit rate of 56kbps, or:
>
> lame -v -b56 infile.mp3 outfile.mp3
encoding to variable bitrate, old slow algorithm, minimal bitrate for frames
56Kib (waste)
> I tried using the second option, at 56, 64, and 128kbps. None of these
> made much difference in the file size, however. I then tried :
>
> lame -V6 infile.mp3 outfile.mp3
>
> which cut the file size by about 20%.
I think you should read lame's manpage more carefully.
> When I tried using -abr the file size shrank by about 60%, but, I used
> values of -abr56, -abr64, and -abr128. All three ouput files had the
> same size and, according to mp3info, all were encoded at 64kbps.
>
> What did I do wrong?
>
> What is the best way to resample MP#s so that reasonable quality is
> retained, while file size is noticeably reduced.?
don't resample at all, unless you have very high bitrates (e.g. 320Kib/s)
or slow CPU (for my Nokia 6230 I resample using "--vbr-new -q0 -V7 -B 112 -p")
56Kib/s is very low quality, I consider 64 Kib/s low for normal hearing.
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