diff --git a/cmd/cmaf-ingest-receiver/app/channel.go b/cmd/cmaf-ingest-receiver/app/channel.go
index 40c2ef8..58dafac 100644
--- a/cmd/cmaf-ingest-receiver/app/channel.go
+++ b/cmd/cmaf-ingest-receiver/app/channel.go
@@ -180,7 +180,7 @@ func (ch *channel) addInitDataAndUpdateTimescale(stream stream, init *mp4.InitSe
 
 	ch.addTrData(r)
 	switch sampleEntry {
-	case "avc1", "hvc1", "mp4a", "stpp", "wvtt":
+	case "avc1", "hvc1", "mp4a", "stpp", "wvtt", "ac-3", "ec-3":
 		// OK
 	case "evte": // Event stream. Don't add to MPD or contentinfo, but keep the segments.
 		// TODO. Handle event streams for SCTE-35 events and other cases
diff --git a/cmd/livesim2/app/asset.go b/cmd/livesim2/app/asset.go
index ebde6f4..ba1a5a3 100644
--- a/cmd/livesim2/app/asset.go
+++ b/cmd/livesim2/app/asset.go
@@ -706,6 +706,8 @@ func (r RepData) sampleDur() uint32 {
 	switch {
 	case strings.HasPrefix(r.Codecs, "mp4a.40") && r.MediaTimescale == 48000:
 		return 1024
+	case (strings.HasPrefix(r.Codecs, "ac-3") || strings.HasPrefix(r.Codecs, "ec-3")) && r.MediaTimescale == 48000:
+		return 1536
 	default:
 		return 0
 	}