diff --git a/hosts/nyarlathotep/configuration.nix b/hosts/nyarlathotep/configuration.nix
index 9456b69e..56b79acf 100644
--- a/hosts/nyarlathotep/configuration.nix
+++ b/hosts/nyarlathotep/configuration.nix
@@ -363,7 +363,7 @@ in
     enable = true;
     description = "Automatically tag new podcast files";
     wantedBy = [ "multi-user.target" ];
-    path = with pkgs; [ inotifyTools id3v2 ];
+    path = with pkgs; [ ffmpeg inotifyTools id3v2 ];
     unitConfig.RequiresMountsFor = "/mnt/nas";
     serviceConfig = {
       WorkingDirectory = "/mnt/nas/music/Podcasts/";
diff --git a/hosts/nyarlathotep/jobs/tag-podcasts.sh b/hosts/nyarlathotep/jobs/tag-podcasts.sh
index 16d15c39..359b02c6 100644
--- a/hosts/nyarlathotep/jobs/tag-podcasts.sh
+++ b/hosts/nyarlathotep/jobs/tag-podcasts.sh
@@ -4,6 +4,18 @@ set -e
 
 sleep 60
 
+for m4afile in */in/*.m4a; do
+  if [[ ! -f "$m4afile" ]]; then
+    break
+  fi
+
+  bitrate=$(ffprobe -v quiet -of flat=s=_ -show_entries format=bit_rate "${m4afile}" | sed 's/[^0-9]*//g')
+  destination="$(echo "$m4afile" | sed 's:m4a$:mp3:')"
+  echo "m4a: ${m4afile} -> ${destination}" >&2
+  ffmpeg -y -i "$m4afile" -codec:a libmp3lame -b:a "$bitrate" -q:a 2 "$destination"
+  rm "$m4afile"
+done
+
 for mp3file in */in/*.mp3; do
   if [[ ! -f "$mp3file" ]]; then
     break