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Index: libhb/muxmkv.c===================================================================--- libhb/muxmkv.c	(revision 1290)+++ libhb/muxmkv.c	(working copy)@@ -173,9 +173,18 @@                 }                 break;             case HB_ACODEC_FAAC:-                track->codecPrivate = audio->config.aac.bytes;-                track->codecPrivateSize = audio->config.aac.length;-                track->codecID = MK_ACODEC_AAC;+                if( job->audio_mixdowns[i] == HB_AMIXDOWN_AC3 )+                {+                    track->codecPrivate = NULL;+                    track->codecPrivateSize = 0;+                    track->codecID = MK_ACODEC_AC3; +                }+                else+                {+                    track->codecPrivate = audio->config.aac.bytes;+                    track->codecPrivateSize = audio->config.aac.length;+                    track->codecID = MK_ACODEC_AAC;+                }                 break;             default:                 *job->die = 1;@@ -192,7 +201,7 @@         track->trackType = MK_TRACK_AUDIO;         track->language = audio->iso639_2;         track->extra.audio.samplingFreq = (float)job->arate;-        track->extra.audio.channels = (job->acodec == HB_ACODEC_AC3) ? HB_INPUT_CH_LAYOUT_GET_DISCRETE_COUNT(audio->input_channel_layout) : HB_AMIXDOWN_GET_DISCRETE_CHANNEL_COUNT(audio->amixdown);+        track->extra.audio.channels = (job->acodec == HB_ACODEC_AC3 || job->audio_mixdowns[i] == HB_AMIXDOWN_AC3  ) ? HB_INPUT_CH_LAYOUT_GET_DISCRETE_COUNT(audio->input_channel_layout) : HB_AMIXDOWN_GET_DISCRETE_CHANNEL_COUNT(audio->amixdown); //        track->defaultDuration = job->arate * 1000;         mux_data->track = mk_createTrack(m->file, track);         if (job->acodec == HB_ACODEC_VORBIS && track->codecPrivate != NULL)