diff --git a/copyparty/mtag.py b/copyparty/mtag.py
index ad14cb38..a9bda4c3 100644
--- a/copyparty/mtag.py
+++ b/copyparty/mtag.py
@@ -75,6 +75,7 @@ def parse_ffprobe(txt):
             continue
 
         have[typ] = True
+        kvm = []
 
         if typ == "audio":
             kvm = [
diff --git a/copyparty/th_srv.py b/copyparty/th_srv.py
index b868fad6..7d34cc33 100644
--- a/copyparty/th_srv.py
+++ b/copyparty/th_srv.py
@@ -254,7 +254,7 @@ class ThumbSrv(object):
     def conv_ffmpeg(self, abspath, tpath):
         ret, _ = ffprobe(abspath)
 
-        dur = ret[".dur"][1]
+        dur = ret[".dur"][1] if ".dur" in ret else 4
         seek = "{:.0f}".format(dur / 3)
 
         scale = "scale={0}:{1}:force_original_aspect_ratio="