diff --git a/Source/MediaInfo/Audio/File_Ac3.cpp b/Source/MediaInfo/Audio/File_Ac3.cpp
index 2d278d4783..b4920964a5 100644
--- a/Source/MediaInfo/Audio/File_Ac3.cpp
+++ b/Source/MediaInfo/Audio/File_Ac3.cpp
@@ -1086,6 +1086,7 @@ File_Ac3::File_Ac3()
     TimeStamp_IsParsing=false;
     TimeStamp_Parsed=false;
     TimeStamp_Count=0;
+    Stream_Size_Total=0;
     BigEndian=true;
     IgnoreCrc_Done=false;
 }
@@ -1772,6 +1773,8 @@ void File_Ac3::Streams_Finish()
             }
         }
     }
+    if (IsSub && Stream_Size_Total && Core_IsPresent)
+        Fill(Stream_Audio, 0, Audio_StreamSize, Stream_Size_Total);
     else if (FrameInfo.PTS!=(int64u)-1 && FrameInfo.PTS>PTS_Begin)
     {
         Fill(Stream_Audio, 0, Audio_Duration, float64_int64s(((float64)(FrameInfo.PTS-PTS_Begin))/1000000));
@@ -2265,6 +2268,8 @@ void File_Ac3::Data_Parse()
         Buffer_Size=Save_Buffer_Size;
         File_Offset-=Buffer_Offset;
     }
+    if (IsSub)
+        Stream_Size_Total+=Element_Size;
 }
 
 //---------------------------------------------------------------------------
diff --git a/Source/MediaInfo/Audio/File_Ac3.h b/Source/MediaInfo/Audio/File_Ac3.h
index 1b88cd978a..a1cacc9b43 100644
--- a/Source/MediaInfo/Audio/File_Ac3.h
+++ b/Source/MediaInfo/Audio/File_Ac3.h
@@ -200,6 +200,7 @@ private :
     TimeCode TimeStamp_FirstFrame;
     int16u   TimeStamp_FirstFrame_SampleNumber;
     size_t TimeStamp_Count;
+    int64u   Stream_Size_Total;
 };
 
 } //NameSpace