diff --git a/convert.py b/convert.py
new file mode 100644
index 0000000..aecb515
--- /dev/null
+++ b/convert.py
@@ -0,0 +1,10 @@
+import subprocess as sp
+import os
+
+def ogg(fin, fout):
+    p1 = sp.Popen(["ffmpeg", "-loglevel", "error", "-i", fin, "-f", "flac", "-"], stdout=sp.PIPE)
+    p2 = sp.Popen(["oggenc", "-Q", "-q", "5", "-", "-o", fout], stdin=p1.stdout, stdout=sp.PIPE)
+    p1.stdout.close()
+    p2.communicate()
+    ret = p1.poll() or p2.poll()
+    return ret
diff --git a/mutaext.py b/mutaext.py
new file mode 100644
index 0000000..18a73d6
--- /dev/null
+++ b/mutaext.py
@@ -0,0 +1,117 @@
+from collections import MutableMapping
+import mutagenx
+import mutagenx.id3
+from mutagenx.easyid3 import EasyID3
+
+def popms(id3):
+    for k, v in id3.items():
+        if k.startswith('POPM'):
+            yield k, v
+
+def byte2rating(b):
+    if b >= 224: return 5
+    if b >= 160: return 4
+    if b >= 96: return 3
+    if b >= 32: return 2
+    if b >= 1: return 1
+    return 0
+
+def rating2byte(r):
+    if r == 5: return 256
+    if r == 4: return 192
+    if r == 3: return 128
+    if r == 2: return 64
+    if r == 1: return 1
+    return 0
+
+def rating_get(id3, key):
+    if 'TXXX:RATING' in id3:
+        rating = id3['TXXX:RATING']
+        return list(rating.text)
+    else:
+        try:
+            _, popm = next(popms(id3))
+        except StopIteration:
+            return []
+        else:
+            return [str(byte2rating(popm.rating))]
+
+def _canconv(r):
+    try:
+        ir = int(r)
+        if ir != str(ir):
+            return False
+        return ir >= 1 and ir <= 5
+    except (ValueError, TypeError):
+        return False
+
+def rating_set(id3, key, val):
+    rating_delete(id3, key)
+    if _canconv(val):
+        popm = mutagenx.id3.POPM()
+        popm.email = "Windows Media Player 9 Series"
+        popm.count = 0
+        popm.rating = rating2byte(int(val))
+        id3.add(popm)
+    else:
+        if 'TXXX:RATING' in id3:
+            del(id3['TXXX:RATING'])
+        id3.add(mutagenx.id3.TXXX(encoding=3, desc='RATING', text=str(val)))
+
+def rating_delete(id3, key):
+    for k, v in popms(id3):
+        del(id3[k])
+    if 'TXXX:RATING' in id3:
+        del(id3['TXXX:RATING'])
+
+replaygain_tags = ('replaygain_album_gain', 'replaygain_album_peak', \
+  'replaygain_track_gain', 'replaygain_track_peak')
+for tag in replaygain_tags:
+    EasyID3.RegisterTXXXKey(tag, tag)
+
+extra_tags = ('sync', 'totaltracks', 'totaldiscs')
+for tag in extra_tags:
+    EasyID3.RegisterTXXXKey(tag, tag.upper())
+
+EasyID3.RegisterTextKey('albumartist', 'TPE2')
+EasyID3.RegisterKey('rating', rating_get, rating_set, rating_delete)
+
+class SyncFile(MutableMapping):
+    def __init__(self, path):
+        self.md = mutagenx.File(path, easy=True)
+        self.path = path
+        self.seen = False
+
+    def __getitem__(self, key):
+        if self.md == None:
+            print(self.path)
+        d = self.md[key]
+        try:
+            return d[0]
+        except IndexError:
+            raise KeyError(key)
+
+    def __setitem__(self, key, value):
+        #if type(value) != str:
+            #raise ValueError
+        if type(value) is type(None):
+            raise ValueError
+        self.md[key] = [value]
+
+    def __delitem__(self, key):
+        del(self.md[key])
+
+    def __iter__(self):
+        for k in self.md:
+            try:
+                self.__getitem__(k)
+            except KeyError:
+                pass
+            else:
+                yield k
+
+    def __len__(self):
+        return len([k for k in self.__iter__()])
+
+    def save(self):
+        return self.md.save()
diff --git a/unsync.py b/unsync.py
new file mode 100755
index 0000000..d70cb78
--- /dev/null
+++ b/unsync.py
@@ -0,0 +1,172 @@
+#!/bin/python
+
+import os, os.path
+import sys
+from shutil import copy2
+from tempfile import mkstemp
+from zlib import crc32
+
+import mutaext
+import convert
+from mutaext import SyncFile
+
+goodexts = ('.mp3', '.flac', '.ogg')
+
+matchtags = ['artist', 'album', 'title', 'tracknumber', 'discnumber']
+alltags = [
+    'albumartist', 'composer', 'comment',
+    'genre', 'date',
+]
+alltags.extend(mutaext.replaygain_tags)
+alltags.extend(mutaext.extra_tags)
+alltags.extend(matchtags)
+
+lament = lambda *args, **kwargs: print(*args, file=sys.stderr, **kwargs)
+walkfiles = lambda w: (os.path.join(r, f) for r, _, fs in w for f in fs)
+extof = lambda p: os.path.splitext(p)[1].lower()
+filterext = lambda ps, es: (p for p in ps if extof(p) in es)
+
+def shouldsync(md):
+    rating = md.get('rating', '')
+    sync = md.get('sync', '')
+    if rating.isnumeric():
+        rating = int(rating)
+    if sync:
+        sync = sync.lower()
+
+    return sync == 'yes' or type(rating) == int and rating >= 3 and sync != 'no' and sync != 'space'
+
+import re
+re_digits = re.compile(r'\d+')
+def tonumber(crap):
+    if crap is None or len(crap) == 0:
+        return 0
+    nums = re_digits.findall(crap)
+    if len(nums) == 0:
+        return 0
+    return int(nums[0])
+
+def fixmetadata(md):
+    md['artist'] = md.get('artist', "Unknown Artist")
+    md['album'] = md.get('album', "Unknown Album")
+    md['discnumber'] = str(tonumber(md.get('discnumber', '0')))
+    md['tracknumber'] = str(tonumber(md.get('tracknumber', '0')))
+    if 'title' not in md:
+        fn = os.path.basename(md.path)
+        fn = os.path.splitext(fn)[0]
+        md['title'] = str(fn)
+
+def findmatching(haystack, needle):
+    #matchme = [needle[t].lower() for t in matchtags]
+    #ismatch = lambda hay: [hay[t].lower() for t in matchtags] == matchme
+    matchme = [needle[t] for t in matchtags]
+    ismatch = lambda hay: [hay[t] for t in matchtags] == matchme
+    for match in (hay for hay in haystack if ismatch(hay)):
+        if match.seen:
+            # TODO: check other tags too?
+            lament("Duplicate")
+            return None
+        match.seen = needle.path
+        return match
+
+def updatemetadata(mdold, mdnew):
+    modified = False
+    for tag in alltags:
+        if tag in mdnew:
+            if tag not in mdold or mdnew[tag] != mdold[tag]:
+                mdold[tag] = mdnew[tag]
+                modified = True
+        elif tag in mdold:
+            del mdold[tag]
+            modified = True
+    return modified
+
+def makefilename(md):
+    title = md['title']
+    artist = md['artist']
+    album = md['album']
+    track = md['tracknumber']
+    disc = md['discnumber']
+
+    fn = "%(disc)s-%(track)s - %(artist)s - %(album)s - %(title)s" % locals()
+    # FAT is a pain to deal with so just use nondescript filenames
+    crc = crc32(fn.encode('utf-8')) & 0xFFFFFFFF
+    fn = '{:08X}.ogg'.format(crc)
+
+    return fn
+
+def run(args):
+    if not len(args) in (2, 3):
+        lament("I need a path or two!")
+        return 1
+    inonly = len(args) == 2
+
+    tosync = []
+    indir = args[1]
+    paths = lambda dir: filterext(walkfiles(os.walk(dir)), goodexts)
+
+    for p in paths(indir):
+        md = SyncFile(p)
+        if shouldsync(md):
+            if inonly:
+                print(p)
+            else:
+                fixmetadata(md)
+                tosync.append(md)
+
+    if inonly:
+        return 0
+
+    lament("Matching tags...")
+
+    outdir = args[2]
+    for p in paths(outdir):
+        md = SyncFile(p)
+        fixmetadata(md)
+        match = findmatching(tosync, md)
+        if match == None:
+            print("DEL", p)
+            print('was', md['title'], 'by', md['artist'])
+            os.remove(p)
+        elif updatemetadata(md, match):
+            print("UPD", p)
+            md.save()
+
+    lament("Syncing files...")
+
+    for md in tosync:
+        fn = makefilename(md)
+        fout = os.path.join(outdir, fn)
+
+        if md.seen:
+            _from = md.seen
+            _to = fout
+            if _from != _to:
+                print("MOV", _from)
+                os.rename(_from, _to)
+            continue
+
+        print("ADD", md.path)
+
+        _, ftemp = mkstemp()
+        try:
+            convert.ogg(md.path, ftemp)
+            mdnew = SyncFile(ftemp)
+            for tag in alltags:
+                if tag in md:
+                    mdnew[tag] = md[tag]
+            fixmetadata(mdnew) # redundant?
+            mdnew.save()
+            copy2(ftemp, fout)
+        finally:
+            os.remove(ftemp)
+
+    return 0
+
+if __name__ == '__main__':
+    ret = 0
+    try:
+        ret = run(sys.argv)
+    except KeyboardInterrupt:
+        sys.exit(1)
+    sys.exit(ret)