[SOLVED] Conversion from WAV through CDR to MP3

w1k0 · 05-21-2011, 10:34 AM

In 2003 I converted over 25000 of invalid WAV files to MP3 ones using the sequence of commands:

sox file.wav file.cdr
lame file.cdr file.mp3

I used that intermediate method because it wasn’t possible to convert most of these WAV files using lame only. The command lame file.wav file.mp3 displayed in such cases the message:

Code:

Unsupported data format: 0x0002

Now I tried to convert the same WAV files using the same method but lame doesn’t recognize CDR audio format and complains:

Code:

Warning: unsupported audio format

It’s still possible to convert WAV files to MP3 ones using the sequence of commands:

sox file.wav file.raw
lame -s 11.025 file.raw file.mp3

The switch -s 11.025 in the above command is required because without it the resulting MP3 file plays the sound in an accelerated tempo.

Unfortunately when I use RAW audio format the sound in the resulting MP3 files isn’t clear.

So I wonder how can I convert these WAV files to MP3 ones. I see two possibilities:

1. Compile sox using lame and mad libraries.

2. Compile lame enabling CDR audio format.

I tried the first method updating sox sources with the following patch:

Code:

--- CMakeLists.txt      2009-02-12 21:33:57.000000000 +0100
+++ CMakeLists.txt      2011-05-21 17:00:47.000000000 +0200
@@ -65,6 +65,7 @@
 optional(NEED_LIBM math.h m pow "")
 if(NEED_LIBM)
   set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} -lm)
+  set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} mpglib)
 endif(NEED_LIBM)
 optional(EXTERNAL_GSM gsm/gsm.h gsm gsm_create "")
 optional(EXTERNAL_LPC10 lpc10/lpc10.h lpc10 lpc10_create "")

In result I can convert WAV files to MP3 ones using sox:

sox file.wav file.mp3

Now I wonder how to achieve the same result enabling CDR audio format reading in lame because I prefer the second method. Unfortunately I haven’t idea how to enable that during the configuration of the sources of lame. Its documentation doesn’t mention about such switch.

So my question is: how can I compile lame enabling CDR audio format reading.

w1k0 · 05-21-2011, 06:11 PM

I managed to convert my WAV files to MP3 ones using intermediate CDR format. I found a hint in lame sources – namely in misc/abx.c file:

Code:

    { ".cdr"    , PATH"sox -r44100 -sw -c2 -traw %s -twav -sw -"REDIR },  // CD-DA files are treated as CD like audio, no preemphasis info available

After removing obsolete -sw switch and after changing RAW source format to CDR I converted my WAV files using the following commands:

sox file.wav file.cdr
sox -t cdr file.cdr -t wav - | lame -b 32 -m mono - file.mp3

These commands produce with my WAV files MP3 files in 32 kbit/s, 22050 Hz mono format. The parameters of the lame command are customized to produce the files similar to the files produced by the command mentioned in the former post:

sox file.wav file.mp3

On my machine the command:

sox file.wav file.mp3

converts WAV files in 23 minutes producing 130 MB of MP3 files.

and the commands:

sox file.wav file.cdr
sox -t cdr file.cdr -t wav - | lame -b 32 -m mono - file.mp3

convert WAV files in 39 minutes producing 131 MB of MP3 files.

First method is faster but requires patched sox.