Random Wisdom » mp3 http://scrolls.mafgani.net An attempt at organizing my thoughts ... Sun, 13 Mar 2011 22:54:49 +0000 en hourly 1 http://wordpress.org/?v=3.2.1 Re-encoding MP3 files using LAME http://scrolls.mafgani.net/2008/06/re-encoding-mp3-files-using-lame/ http://scrolls.mafgani.net/2008/06/re-encoding-mp3-files-using-lame/#comments Fri, 06 Jun 2008 14:41:00 +0000 Mostafa http://scrolls.mafgani.net/?p=99 I have some MP3 files encoded at a constant bitrate of 320kbps that my phone seems to have trouble playing smoothly. So, I looked into LAME.

The files I had were named using the following scheme:

01 - Title of track 01.mp3
02 - Title of track 02.mp3
...

I used the BASH for-loop construct to process the files:

$ for A in *.mp3;\              # Process one mp3 at a time
  do B=${A%.mp3};\              # Extract track number and title
     C=${B#?? -};\              # Extract the title
     D=${B%% - *};\             # Extract the track number
     lame --vbr-new -V0 -q0\    # Variable-bitrate, high-quality
          --mp3input\           # Inputs are MP3 files
          --tt "$C"\            # ID3v2 tags: title
          --ta 'Artist Name'\   # ID3v2 tags: artist
          --tl 'Album Title'\   # ID3v2 tags: album
          --ty 2007\            # ID3v2 tags: year
          --tn "$D"\            # ID3v2 tags: track no.
          --tg 'GENRE'\         # ID3v2 tags: genre
          "$A" processed/"$A";\ # Keep filename and save in ./processed/
  done

Since no bit-rate bounds are explicitly provided, the re-encoded files can contain anything between 32kbps and 320kbps. The LAME man-page provides an extensive list of options and their meanings.

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