[mad-user] Complemetary questions about decoding a dir and about formats

[j***@telia.com]

Hi list and thanks Rob for your answer,

A few complementary questions, again maybe a bit OT:

I do not really need wav format (by the way, is wav in some way a ms
invention?). What I'm trying to do is to decode a lot of mp3s to a format
usable for listening with a non-mp3-capable cd player, i.e in my car, and
then burn them to CDs with k3b. At the first stage (before burning) I would
like to save the mp3s as individual output files in another directory than
the mp3s.

1. Is .cdr a format for my purposes?
2. Shell scripts are a bit beyond my capacity for the moment (but I'm
learning fast). What do you mean with "The above is for Bourne-derived
shells; hopefully yours is not of Csh variety."?

What about this? If i navigate to the directory where the mp3s are and then:

for file .mp3; do madplay -o -v $file.cdr $file; done

Where in this little script should I put the target directory name (called
"cdr)? What does "done" mean? Close?

TIA
/jrx, Stockholm





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Today's Topics:

1. Decode an old mp3, originally recorded in June-50 (***@telia.com)
2. Decode directories, how to? (***@telia.com)
3. Re: Decode an old mp3, originally recorded in June-50 (Rob Leslie)
4. Re: Decode directories, how to? (Rob Leslie)

--__--__--

Message: 1
From: <***@telia.com>
To: <mad-***@lists.mars.org>
Date: Tue, 30 Dec 2003 22:00:19 +0100
Subject: [mad-user] Decode an old mp3, originally recorded in June-50

Hi, maybe OT.
I have tried to decode an old mp3 with various settings to wav with mad, and
the decoding seems to work fine.

But when I try to burn the wav with k3b, k3b says "wrong format". madplay -v
-i -m --output=wave gives "Layer III, 64 kbps, 22050 Hz, single channel, no
CRC, 7095 frames decoded, -7.4 dB peak amplitude, 0 clipped samples"

Does anybody have any suggestions about what options I should choose when
decoding. I would like to have it in wav.

Or maybe I should look in my k3b settings for this particular file..?

Best regards
/jrx




--__--__--

Message: 2
From: <***@telia.com>
To: <mad-***@lists.mars.org>
Date: Tue, 30 Dec 2003 22:00:19 +0100
Subject: [mad-user] Decode directories, how to?

Hi list,

I would like to decode a whole directory in a bunch. Probably I have to use
some kind of ordinary *nix command (I'm from the other side), but I can't
figure it out, and I can't find any description of this presumably easy
matter in man madplay

Thanks in advance.

jrx


--__--__--

Message: 3
From: Rob Leslie <***@mars.org>
Subject: Re: [mad-user] Decode an old mp3, originally recorded in June-50
Date: Tue, 30 Dec 2003 18:09:11 -0800

I have tried to decode an old mp3 with various settings to wav with
mad, and the decoding seems to work fine.
But when I try to burn the wav with k3b, k3b says "wrong format".
madplay -v -i -m --output=wave gives "Layer III, 64 kbps, 22050 Hz,
single channel, no CRC, 7095 frames decoded, -7.4 dB peak amplitude, 0
clipped samples"
Does anybody have any suggestions about what options I should choose
when decoding. I would like to have it in wav.

If you're trying to burn an audio CD, try:

madplay -o cdda:track.cdr

The result is a raw CD audio track ready to be burned.

If you really must have a WAV file, you'll have to specify all the
parameters yourself:

madplay -o foo.wav --stereo --bit-depth=16 --sample-rate=44100
--
Rob Leslie
***@mars.org


--__--__--

Message: 4
From: Rob Leslie <***@mars.org>
Subject: Re: [mad-user] Decode directories, how to?
Date: Tue, 30 Dec 2003 18:17:10 -0800

I would like to decode a whole directory in a bunch. Probably I have
to use some kind of ordinary *nix command (I'm from the other side),
but I can't figure it out, and I can't find any description of this
presumably easy matter in man madplay

You can either have madplay decode everything in one go:

madplay -o out.wav *.mp3

(in this case there is only one output)

or if you need individual output files you can use some shell scripting
to decode files one-at-a-time:

for file in *.mp3; do madplay -o $file.wav $file; done

The above is for Bourne-derived shells; hopefully yours is not of Csh
variety.

[Rob Leslie]

Post by j***@telia.com
I do not really need wav format (by the way, is wav in some way a ms
invention?).

Yes, as I understand it the WAV file format (RIFF/WAVE) is a Microsoft
bastardization of the IFF standard originally developed by Electronic
Arts (EA IFF 1985).

Post by j***@telia.com
What I'm trying to do is to decode a lot of mp3s to a format usable
for listening with a non-mp3-capable cd player, i.e in my car, and
then burn them to CDs with k3b. At the first stage (before burning) I
would like to save the mp3s as individual output files in another
directory than the mp3s.
1. Is .cdr a format for my purposes?

Sure; most CD burning programs ought to be able to use the raw audio
data written by madplay to such a file.

Post by j***@telia.com
2. Shell scripts are a bit beyond my capacity for the moment (but I'm
learning fast). What do you mean with "The above is for Bourne-derived
shells; hopefully yours is not of Csh variety."?

This is definitely off-topic, but FYI --

There are two great classes of UNIX shells: the Bourne shell and its
derivatives (e.g. ksh, bash, zsh), and the C shell and its derivatives
(e.g. tcsh). The former class is generally more powerful; the latter
suffers inherent weaknesses but is unfortunately a common shell for
interactive use.

To find out which you have, you can 'echo $SHELL'. If you get back
something that ends with csh, you'll either have to change your
scripting style or change your shell. (Sorry, I can't help you with csh
scripting.)

Post by j***@telia.com
for file .mp3; do madplay -o -v $file.cdr $file; done
Where in this little script should I put the target directory name (called
"cdr)? What does "done" mean? Close?

Try something like this:

for file in *.mp3; do madplay -v -o cdr/$file.cdr $file; done

"done" marks the end of the "for ... do" loop.