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Full Discussion: Batch MP3 transcoding.
Top Forums Shell Programming and Scripting Batch MP3 transcoding. Post 302270960 by lvxferre on Tuesday 23rd of December 2008 09:54:00 AM
Old 12-23-2008
Quote:
Originally Posted by Franklin52
One awk command is sufficient, try this:

Code:
find . -name "*.mp3" -exec mp3info -r v -p "%r \"%F\"\n" '{}' \; | 
gawk '$1 >= 160{$1 = "";system("lame -v" $0)}'

To rename the files you can use this:

Code:
ls *.mp3.mp3 | sed 's/\(.*\)\..*/mv & \1/' | sh

Make sure you get the right files and try it first without te coloured portion.

Regards
Thank you!

I was a bit afraid telling the gawk ">= 160", because I didn't know what it would do for non-number strings (as "variable").

Now the code is much simpler... I've tested it, the awk part works nice.

The renaming part, as you posted, wasn't working for file names with spaces; some quotes made the job Smilie . The last pipe was really needed for interpreting as a command.

Code:
find *.mp3.mp3 | sed 's/\(.*\)\..*/mv -f "&" "\1"/' | sh

The over-consuming step - LAME - still remains, but I think it can't be helped...

Just for curiosity... I've noticed that the find command works in a random order, not alphabetically, is this correct?

Regards!
[hr]
EDIT: Contrary what I said before... for gawk, "variable" >= 160. I changed the "more or equal" again to "exactly equal"... here's the code:

Code:
#!/bin/bash

find . -name "*.mp3" -exec mp3info -r v -p "%r \"%F\"\n" '{}' \; |
gawk '$1 == 160{$1 = "";system("lame -v" $0)}
$1 == 192{$1 = "";system("lame -v" $0)}
$1 == 256{$1 = "";system("lame -v" $0)}
$1 == 320{$1 = "";system("lame -v" $0)}'

find *.mp3.mp3 | sed 's/\(.*\)\..*/mv -f "&" "\1"/' | sh
echo UFA, TERMINOU =D

Last edited by lvxferre; 12-23-2008 at 02:01 PM.. Reason: Adicional info.
 

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LEARN ABOUT DEBIAN

normalize-mp3

NORMALIZE-MP3(1)					      General Commands Manual						  NORMALIZE-MP3(1)

NAME

       normalize-mp3 - adjust levels of mp3 or ogg files by running normalize-audio(1), then re-encoding

SYNOPSIS

	normalize-mp3 [OPTION]... [FILE]...
	normalize-ogg [OPTION]... [FILE]...

DESCRIPTION

       Normalize  volume  of  mp3  or  ogg  files  by decoding, running normalize, and re-encoding.  This requires as much extra disk space as the
       largest mp3 or ogg file, decoded.  Note that for batch and mix mode, all files must be decoded, so there must be enough disk space for  the
       decoded copies of all specified mp3 and ogg files.

       --ogg  Convert files to OGG, regardless of original format

       --mp3  Convert files to MP3, regardless of original format

       --bitrate BR
	      Set bitrate of re-encoded file (default 128)

       --tmpdir TMP
	      Put temporary WAV files in temp directory TMP

       --notags
	      Do not copy ID3 or OGG tags to the output file

       The  following  four options may be used to set the encoder and decoder commands for mp3 and ogg vorbis.  %m is expanded to the name of the
       mp3 or vorbis file, %w expands to the name of the temporary WAV file, and %b expands to the bitrate, as specified by the --bitrate  option.
       Run normalize-mp3 with no arguments to see the default values.

       --mp3encode=X
	      mp3 encoder

       --mp3decode=X
	      mp3 decoder

       --oggencode=X
	      ogg vorbis encoder

       --oggdecode=X
	      ogg vorbis decoder

       -h     Display this help and exit.

       -V     Display version information and exit.

       These arguments are passed as arguments to normalize-audio.
	      Run "normalize-audio --help" for more info.

       -a AMP

       -g ADJ

       -n

       -T THR

       -b

       -m

       -v

       -q

       REPORTING BUGS
	      Report bugs to <chrisvaill@gmail.com>.

SEE ALSO

       The normalize-audio(1) Man page

NOTES

       This page was provided by Eduardo Macan <macan@debian.org>

								  September 2001						  NORMALIZE-MP3(1)
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