diff --git a/copyparty/svchub.py b/copyparty/svchub.py
index 02929500..11da5709 100644
--- a/copyparty/svchub.py
+++ b/copyparty/svchub.py
@@ -18,6 +18,7 @@ from .authsrv import AuthSrv
 from .tcpsrv import TcpSrv
 from .up2k import Up2k
 from .th_srv import ThumbSrv, HAVE_PIL, HAVE_WEBP
+from .mtag import HAVE_FFMPEG, HAVE_FFPROBE
 
 
 class SvcHub(object):
@@ -88,6 +89,11 @@ class SvcHub(object):
                     "thumb", msg.format(" " * 37, os.path.basename(sys.executable)), c=3
                 )
 
+        if not args.no_acode and (not HAVE_FFMPEG or not HAVE_FFPROBE):
+            msg = "setting --no-acode because either FFmpeg or FFprobe is not available"
+            self.log("thumb", msg, c=6)
+            args.no_acode = True
+
         # decide which worker impl to use
         if self.check_mp_enable():
             from .broker_mp import BrokerMp as Broker
diff --git a/copyparty/th_srv.py b/copyparty/th_srv.py
index 4358ceaf..ee2662c3 100644
--- a/copyparty/th_srv.py
+++ b/copyparty/th_srv.py
@@ -51,7 +51,7 @@ except:
 # ffmpeg -formats
 FMT_PIL = "bmp dib gif icns ico jpg jpeg jp2 jpx pcx png pbm pgm ppm pnm sgi tga tif tiff webp xbm dds xpm"
 FMT_FFV = "av1 asf avi flv m4v mkv mjpeg mjpg mpg mpeg mpg2 mpeg2 h264 avc mts h265 hevc mov 3gp mp4 ts mpegts nut ogv ogm rm vob webm wmv"
-FMT_FFA = "aac m4a ogg opus flac alac mp3 mp2 ac3 dts wma ra wav aif aiff au amr gsm ape tak tta wv"
+FMT_FFA = "aac m4a ogg opus flac alac mp3 mp2 ac3 dts wma ra wav aif aiff au alaw ulaw mulaw amr gsm ape tak tta wv"
 
 if HAVE_HEIF:
     FMT_PIL += " heif heifs heic heics"
diff --git a/copyparty/web/browser.js b/copyparty/web/browser.js
index c8f4f3b6..eb00ee10 100644
--- a/copyparty/web/browser.js
+++ b/copyparty/web/browser.js
@@ -470,7 +470,7 @@ var mpl = (function () {
 
 
 var re_au_native = /\.(opus|ogg|m4a|aac|mp3|wav|flac)$/i,
-	re_au_all = /\.(aac|m4a|ogg|opus|flac|alac|mp3|mp2|ac3|dts|wma|ra|wav|aif|aiff|au|amr|gsm|ape|tak|tta|wv)$/i;
+	re_au_all = /\.(aac|m4a|ogg|opus|flac|alac|mp3|mp2|ac3|dts|wma|ra|wav|aif|aiff|au|alaw|ulaw|mulaw|amr|gsm|ape|tak|tta|wv)$/i;
 
 
 // extract songs + add play column
@@ -486,7 +486,7 @@ function MPlayer() {
 	r.tracks = {};
 	r.order = [];
 
-	var re_audio = mpl.ac_oth ? re_au_all : re_au_native,
+	var re_audio = have_acode && mpl.ac_oth ? re_au_all : re_au_native,
 		trs = QSA('#files tbody tr');
 
 	for (var a = 0, aa = trs.length; a < aa; a++) {