add client-play-format-h264-mpeg4audio-save-to-disk example (#230) (#582)

examples/client-play-format-opus-save-to-disk/main.go

@@ -13,7 +13,7 @@ import (
 // This example shows how to
 // 1. connect to a RTSP server
 // 2. check if there's a Opus format
-// 3. save the content of the format into a file in MPEG-TS format
+// 3. save the content of the format in a file in MPEG-TS format
 
 func main() {
 	c := gortsplib.Client{}
@@ -55,19 +55,15 @@ func main() {
 		fileName: "mystream.ts",
 		track: &mpegts.Track{
 			Codec: &mpegts.CodecOpus{
-				ChannelCount: func() int {
-					if forma.IsStereo {
-						return 2
-					}
-					return 1
-				}(),
+				ChannelCount: forma.ChannelCount,
 			},
 		},
 	}
-	mpegtsMuxer.initialize()
+	err = mpegtsMuxer.initialize()
 	if err != nil {
 		panic(err)
 	}
+	defer mpegtsMuxer.close()
 
 	// setup a single media
 	_, err = c.Setup(desc.BaseURL, medi, 0, 0)