diff --git a/Source/Python/utils/mp4-dash.py b/Source/Python/utils/mp4-dash.py
index c0e8b4a1..0a468636 100755
--- a/Source/Python/utils/mp4-dash.py
+++ b/Source/Python/utils/mp4-dash.py
@@ -1142,7 +1142,7 @@ def OutputSmooth(options, audio_tracks, video_tracks):
             audio_tag = '65534'
             fourcc = 'EC-3'
             channels = str(channels)
-            data_rate = int(audio_track.info['sample_descriptions'][0]['dolby_digital_info']['data_rate'])
+            data_rate = int(audio_track.info['sample_descriptions'][0]['dolby_digital_plus_info']['data_rate'])
             packet_size = str(4*data_rate)
         else:
             # assume AAC
diff --git a/Source/Python/utils/mp4utils.py b/Source/Python/utils/mp4utils.py
index 16ccd9e8..68c9de29 100644
--- a/Source/Python/utils/mp4utils.py
+++ b/Source/Python/utils/mp4utils.py
@@ -1050,7 +1050,7 @@ def ComputeDolbyDigitalPlusSmoothStreamingInfo(track):
     mask_hex_be = "{0:0{1}x}".format(channel_mask, 4)
     info += mask_hex_be[2:4]+mask_hex_be[0:2]+'0000'
     info += "af87fba7022dfb42a4d405cd93843bdd"
-    info += track.info['sample_descriptions'][0]['dolby_digital_info']['dec3_payload']
+    info += track.info['sample_descriptions'][0]['dolby_digital_plus_info']['dec3_payload']
     return (channel_count, info.lower())
 
 def ComputeMarlinPssh(options):