animetosho2mks: Use parallel processing

animetosho2mks.py

@@ -1,9 +1,11 @@
 #!/usr/bin/env cached-nix-shell
 #!nix-shell -i python3 -p "python3.withPackages(ps: [ ps.tqdm ])" mkvtoolnix-cli
-from subprocess import run
-from tqdm import tqdm
 import glob
+import multiprocessing
 import os.path
+from subprocess import run
+
+from tqdm import tqdm
 
 
 class SubtitleTrack:
@@ -69,5 +71,8 @@ class AnimeToshoFile:
         run(command, check=True)
 
 
-for file in tqdm(list(map(AnimeToshoFile, glob.glob("*.mkv")))):
-    file.merge()
+files = list(map(AnimeToshoFile, glob.glob("*.mkv")))
+
+
+with multiprocessing.Pool() as pool:
+    list(tqdm(pool.imap_unordered(AnimeToshoFile.merge, files), total=len(files)))