From f80f179e4c3c7a9c0221312bf15516cb6ade3214 Mon Sep 17 00:00:00 2001
From: Alexey Khit <alexey.khit@gmail.com>
Date: Mon, 21 Aug 2023 07:31:21 +0300
Subject: [PATCH] Fix MP4 consumer with only audio

---
 pkg/core/codec.go   | 12 ++++++++++++
 pkg/mp4/consumer.go |  4 ++++
 2 files changed, 16 insertions(+)

diff --git a/pkg/core/codec.go b/pkg/core/codec.go
index 4709abc1..90af2c65 100644
--- a/pkg/core/codec.go
+++ b/pkg/core/codec.go
@@ -52,6 +52,18 @@ func (c *Codec) IsRTP() bool {
 	return c.PayloadType != PayloadTypeRAW
 }
 
+func (c *Codec) IsVideo() bool {
+	return c.Kind() == KindVideo
+}
+
+func (c *Codec) IsAudio() bool {
+	return c.Kind() == KindAudio
+}
+
+func (c *Codec) Kind() string {
+	return GetKind(c.Name)
+}
+
 func (c *Codec) Clone() *Codec {
 	clone := *c
 	return &clone
diff --git a/pkg/mp4/consumer.go b/pkg/mp4/consumer.go
index b1392e29..89c73cf7 100644
--- a/pkg/mp4/consumer.go
+++ b/pkg/mp4/consumer.go
@@ -153,6 +153,10 @@ func (c *Consumer) AddTrack(media *core.Media, _ *core.Codec, track *core.Receiv
 }
 
 func (c *Consumer) WriteTo(wr io.Writer) (int64, error) {
+	if len(c.Senders) == 1 && c.Senders[0].Codec.IsAudio() {
+		c.start = true
+	}
+
 	init, err := c.muxer.GetInit()
 	if err != nil {
 		return 0, err