diff --git a/app/src/demuxer.c b/app/src/demuxer.c
index 69d82c19..b48859d9 100644
--- a/app/src/demuxer.c
+++ b/app/src/demuxer.c
@@ -273,10 +273,12 @@ end:
 }
 
 void
-sc_demuxer_init(struct sc_demuxer *demuxer, sc_socket socket,
-                const struct sc_demuxer_callbacks *cbs, void *cbs_userdata) {
+sc_demuxer_init(struct sc_demuxer *demuxer, enum sc_stream_id stream_id,
+                sc_socket socket, const struct sc_demuxer_callbacks *cbs,
+                void *cbs_userdata) {
     assert(socket != SC_SOCKET_NONE);
 
+    demuxer->stream_id = stream_id;
     demuxer->socket = socket;
     demuxer->pending = NULL;
     demuxer->sink_count = 0;
diff --git a/app/src/demuxer.h b/app/src/demuxer.h
index 11e20ad6..a2fe6bf3 100644
--- a/app/src/demuxer.h
+++ b/app/src/demuxer.h
@@ -14,7 +14,13 @@
 
 #define SC_DEMUXER_MAX_SINKS 2
 
+enum sc_stream_id {
+    SC_STREAM_ID_VIDEO,
+    SC_STREAM_ID_AUDIO,
+};
+
 struct sc_demuxer {
+    enum sc_stream_id stream_id;
     sc_socket socket;
     sc_thread thread;
 
@@ -36,8 +42,9 @@ struct sc_demuxer_callbacks {
 };
 
 void
-sc_demuxer_init(struct sc_demuxer *demuxer, sc_socket socket,
-                const struct sc_demuxer_callbacks *cbs, void *cbs_userdata);
+sc_demuxer_init(struct sc_demuxer *demuxer, enum sc_stream_id stream_id,
+                sc_socket socket, const struct sc_demuxer_callbacks *cbs,
+                void *cbs_userdata);
 
 void
 sc_demuxer_add_sink(struct sc_demuxer *demuxer, struct sc_packet_sink *sink);
diff --git a/app/src/scrcpy.c b/app/src/scrcpy.c
index 7b4ca6a6..77a5ad21 100644
--- a/app/src/scrcpy.c
+++ b/app/src/scrcpy.c
@@ -434,15 +434,15 @@ scrcpy(struct scrcpy_options *options) {
     static const struct sc_demuxer_callbacks video_demuxer_cbs = {
         .on_eos = sc_video_demuxer_on_eos,
     };
-    sc_demuxer_init(&s->video_demuxer, s->server.video_socket,
-                    &video_demuxer_cbs, NULL);
+    sc_demuxer_init(&s->video_demuxer, SC_STREAM_ID_VIDEO,
+                    s->server.video_socket, &video_demuxer_cbs, NULL);
 
     if (options->audio) {
         static const struct sc_demuxer_callbacks audio_demuxer_cbs = {
             .on_eos = sc_audio_demuxer_on_eos,
         };
-        sc_demuxer_init(&s->audio_demuxer, s->server.audio_socket,
-                        &audio_demuxer_cbs, NULL);
+        sc_demuxer_init(&s->audio_demuxer, SC_STREAM_ID_AUDIO,
+                        s->server.audio_socket, &audio_demuxer_cbs, NULL);
     }
 
     if (dec) {