Flatten directory with incrementing names

I need a bash script for flattening a directory with same names, and get an ordered output after a conversion.

input folder structure:

/in1/file1.wav
/in1/file2.wav
/in1/file3.wav
/in2/file1.wav
/in2/file2.wav
/in2/file3.wav
/in2/file4.wav
/in3/file1.wav
/in3/file2.wav

and I need an output directory like this:

/out/file0001.mp3
/out/file0002.mp3
/out/file0003.mp3
/out/file0004.mp3
/out/file0005.mp3
/out/file0006.mp3
/out/file0007.mp3
/out/file0008.mp3
/out/file0009.mp3

where /out/file004.mp3 is the mp3 conversion of /in2/file1.wav

I've done some trials with find -exec but I can't get it to work

(don't worry about conversion, I just use ffmpeg -i fileinput fileoutput.mp3)

2 Answers

ok, i understand that shell scripting is a really power tool but it is real mess:

i have tried with thefourtheye answer but the sort command messed everything up because of the order was like this:

Sequence 1.wav
Sequence 10.wav
Sequence 11.wav
Sequence 12.wav
Sequence 2.wav
Sequence 3.wav
Sequence 4.wav
...

and the spaces was a problem so i had to add " but there was some mess too i don't remember exactly where, then i tried to put some debug print and it didn't work so... In the end I tested it on a Mac OS/X terminal and it has another shell i never heard about (zsh) that uses different commands.. a big mess.

I came up with a small python script. Maybe it is dirty but it works:

import os, sys
count = 1
for dirpath, diname, filenames in os.walk('.'): if dirpath=='.' or dirpath=='./out': continue filenames = [f for f in filenames if f.split('.')[1]=='aif' and f[0]!='.'] filenames = sorted(filenames, key=lambda f: int(f.split('.')[0].split(' ')[1])) for f in filenames: filepath = dirpath+'/'+f ffmpeg_command = 'ffmpeg -i "'+filepath+'" out/track'+"%04d" % (count,)+'.mp3' count += 1 print ffmpeg_command os.system(ffmpeg_command)

Here's roughly how I would do it. Iterate the directories in the right order, then the files. It assumes there's no dir higher than in9/ and no file higher than file99.wav . If there are, extend the loops accordingly. E.g. for dir in in[0-9]/ in[1-9][0-9]/; do

#!/bin/bash
i=0
for dir in in[0-9]/; do for file in "$dir"/file[0-9].wav "$dir"/file[1-9][0-9].wav; do printf -v dest 'out/file%04d.mp3' "$((++i))" ffmpeg -i "$file" "$dest" done
done