hls muxer: add EXT-X-INDEPENDENT-SEGMENTS tag

internal/hls/muxer_stream_playlist.go

@@ -84,6 +84,7 @@ func (p *muxerStreamPlaylist) reader() io.Reader {
 		cnt += "#EXT-X-TARGETDURATION:" + strconv.FormatUint(uint64(targetDuration), 10) + "\n"
 
 		cnt += "#EXT-X-MEDIA-SEQUENCE:" + strconv.FormatInt(int64(p.segmentDeleteCount), 10) + "\n"
+		cnt += "#EXT-X-INDEPENDENT-SEGMENTS\n"
 		cnt += "\n"
 
 		for _, s := range p.segments {

internal/hls/muxer_test.go

@@ -75,6 +75,7 @@ func TestMuxerVideoAudio(t *testing.T) {
 		`#EXT-X-ALLOW-CACHE:NO\n` +
 		`#EXT-X-TARGETDURATION:4\n` +
 		`#EXT-X-MEDIA-SEQUENCE:0\n` +
+		`#EXT-X-INDEPENDENT-SEGMENTS\n` +
 		`\n` +
 		`#EXT-X-PROGRAM-DATE-TIME:(.*?)\n` +
 		`#EXTINF:4,\n` +
@@ -208,6 +209,7 @@ func TestMuxerVideoOnly(t *testing.T) {
 		`#EXT-X-ALLOW-CACHE:NO\n` +
 		`#EXT-X-TARGETDURATION:4\n` +
 		`#EXT-X-MEDIA-SEQUENCE:0\n` +
+		`#EXT-X-INDEPENDENT-SEGMENTS\n` +
 		`\n` +
 		`#EXT-X-PROGRAM-DATE-TIME:(.*?)\n` +
 		`#EXTINF:4,\n` +
@@ -293,6 +295,7 @@ func TestMuxerAudioOnly(t *testing.T) {
 		`#EXT-X-ALLOW-CACHE:NO\n` +
 		`#EXT-X-TARGETDURATION:1\n` +
 		`#EXT-X-MEDIA-SEQUENCE:0\n` +
+		`#EXT-X-INDEPENDENT-SEGMENTS\n` +
 		`\n` +
 		`#EXT-X-PROGRAM-DATE-TIME:(.*?)\n` +
 		`#EXTINF:1,\n` +