Re: [linux-audio-user] lame and low sample-rate mp3's

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Subject: Re: [linux-audio-user] lame and low sample-rate mp3's
From: R Parker (rtp405@yahoo.com)
Date: Tue Jan 21 2003 - 04:18:46 EET

The speed of playback is likely to be sample khz. If
you're resampling from 48000 to 44100, you could do
this with numerous tools including resample. Perhaps
SRC can also be accessed from command line. Anyway,
'resample -to 44100 infile.wav outfile.wav will
produce a file that's ready for compression.

Sorry, in a hurry, didn't carefully read your
post...hope this helps.

ron

--- Marco Scoffier <marco4linux@earthlink.net> wrote:
> I am writing here because my problem involves many
> tools.
>
> I have been trying to make extremely compact mp3's
> for download.
>
> $lame PO_audio.wav -m m -b 8 PO_audio-low.mp3
> LAME version 3.93 MMX (http://www.mp3dev.org/)
> CPU features: i387, MMX (ASM used), SIMD
> Autoconverting from stereo to mono. Setting encoding
> to mono mode.
> Resampling: input 32 kHz output 8 kHz
> Using polyphase lowpass filter, transition band:
> 2742 Hz - 2839 Hz
> Encoding PO_audio_kino.wav.wav to PO_audio-low.mp3
> Encoding as 8 kHz 8 kbps single-ch MPEG-2.5 Layer
> III (16x) qval=2
> Frame | CPU time/estim | REAL
> time/estim | play/CPU | ETA
> 1038/1040 (100%)| 0:05/ 0:05| 0:05/
> 0:05| 13.322x| 0:00
> average: 8.0 kbps
>
> Everything looks right except that when I play the
> resulting file in xmms or
> mgp123 it plays much too fast.
>
>
> Could the headers on the mp3 be wrong? how do I
> check? they show up correctly
> in xmms and mpg123.
>
> mpg123 PO_audio-low.mp3
> ( ... )
> Playing MPEG stream from PO_audio-low.mp3 ...
> MPEG 2.5 layer III, 16 kbit/s, 11025 Hz mono
>
> I know I used to play lower than CD quality sample
> rates.
>
> Does anyone have an idea what is going on?
>
> I have tried differing combinations of ecasound and
> lame with combinations of
> -sr and -rate switches, to often similar results.
>
> I am using the alsa drives from cvs for my audiofile
> 2496,
>
> Thanks,
>
> --Marco

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