Index: test/test.c
===================================================================
--- test/test.c	(revision 2654)
+++ test/test.c	(working copy)
@@ -68,6 +68,7 @@
 static int    default_acodec = HB_ACODEC_FAAC;
 static int    default_abitrate = 160;
 static int    audio_explicit = 0;
+static int64_t audio_delay = 0;
 static char ** subtracks   = NULL;
 static char ** subforce    = NULL;
 static char * subburn     = NULL;
@@ -1794,6 +1795,11 @@
                 }
             }
 
+            if( audio_delay )
+            {
+                job->audio_delay = audio_delay * 90; // Translate from ms to HB time.
+            }
+
             if( srtfile )
             {
                 char * token;
@@ -2270,6 +2276,8 @@
     "                            Separated by commas for more than one audio track.\n"
     "    -A, --aname <string>    Audio track name(s),\n"
     "                            Separated by commas for more than one audio track.\n"
+    "        --adelay <ms>       Set a positive number of ms to bring all the audio\n"
+    "                            tracks earlier, or a negative number of ms to add delay.\n"
     "\n"
 
     "### Picture Settings---------------------------------------------------------\n\n"
@@ -2476,6 +2484,7 @@
     #define SRT_CODESET         270
     #define SRT_OFFSET          271
     #define SRT_LANG            272
+    #define AUDIO_DELAY         273
     
     for( ;; )
     {
@@ -2555,6 +2564,7 @@
             { "vfr",         no_argument,       &cfr,    0 },
             { "cfr",         no_argument,       &cfr,    1 },
             { "pfr",         no_argument,       &cfr,    2 },
+            { "adelay",      required_argument, NULL,   AUDIO_DELAY },
             { 0, 0, 0, 0 }
           };
 
@@ -2980,6 +2990,9 @@
                 else if( atoi( optarg ) == 709 )
                     color_matrix = 2;
                 break;
+            case AUDIO_DELAY:
+                audio_delay = atoi( optarg );
+                break;
             default:
                 fprintf( stderr, "unknown option (%s)\n", argv[optind] );
                 return -1;
Index: libhb/sync.c
===================================================================
--- libhb/sync.c	(revision 2654)
+++ libhb/sync.c	(working copy)
@@ -139,6 +139,8 @@
             pv->busy |= ( 1 << (i + 1) );
             InitAudio( w, i );
         }
+
+        pv->audio_passthru_slip = job->audio_delay;
     }
 
     return 0;
Index: libhb/common.h
===================================================================
--- libhb/common.h	(revision 2654)
+++ libhb/common.h	(working copy)
@@ -234,6 +234,7 @@
 
     /* List of audio settings. */
     hb_list_t     * list_audio;
+    int64_t         audio_delay;
 
     /* Subtitles
      */