fix tests and rendition flags

examples/muxer/main.go

@@ -35,11 +35,13 @@ func handleIndex(wrapped http.HandlerFunc) http.HandlerFunc {
 }
 
 func main() {
+	videoTrack := &gohlslib.Track{
+		Codec: &codecs.H264{},
+	}
+
 	// create the HLS muxer
 	mux := &gohlslib.Muxer{
-		VideoTrack: &gohlslib.Track{
-			Codec: &codecs.H264{},
-		},
+		Tracks: []*gohlslib.Track{videoTrack},
 	}
 	err := mux.Start()
 	if err != nil {
@@ -80,7 +82,7 @@ func main() {
 	for _, track := range r.Tracks() {
 		if _, ok := track.Codec.(*mpegts.CodecH264); ok {
 			// setup a callback that is called once a H264 access unit is received
-			r.OnDataH26x(track, func(rawPTS int64, _ int64, au [][]byte) error {
+			r.OnDataH264(track, func(rawPTS int64, _ int64, au [][]byte) error {
 				// decode the time
 				if timeDec == nil {
 					timeDec = mpegts.NewTimeDecoder(rawPTS)
@@ -89,7 +91,7 @@ func main() {
 
 				// pass the access unit to the HLS muxer
 				log.Printf("visit http://localhost:8080 - encoding access unit with PTS = %v", pts)
-				mux.WriteH264(time.Now(), pts, au)
+				mux.WriteH264(videoTrack, time.Now(), pts, au)
 
 				return nil
 			})

muxer.go

@@ -267,7 +267,7 @@ func (m *Muxer) Start() error {
 				id = "audio" + strconv.FormatInt(int64(i+1), 10)
 			}
 
-			isRendition := !track.isLeading || !isVideo(track.Codec)
+			isRendition := !track.isLeading || (!isVideo(track.Codec) && len(m.Tracks) > 1)
 
 			var isDefaultRendition bool
 			if isRendition && !defaultRenditionChosen {

muxer_stream.go

@@ -177,7 +177,7 @@ func (s *muxerStream) populateMultivariantPlaylist(
 			GroupID:    "audio",
 			Name:       s.id,
 			Autoselect: true,
-			URI:        &uri,
+			Default:    s.isDefaultRendition,
 		}
 
 		// draft-pantos-hls-rfc8216bis: