From 0d6b8fc6fc207c5c89c3cf0923b0cbd38f04ad1b Mon Sep 17 00:00:00 2001
From: Alex X <alexey.khit@gmail.com>
Date: Sun, 29 Dec 2024 11:44:56 +0300
Subject: [PATCH] Fix OPUS/48000/1 for RTSP from some cameras #1506

---
 pkg/rtsp/helpers.go | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/pkg/rtsp/helpers.go b/pkg/rtsp/helpers.go
index 6b07342d..346ecf73 100644
--- a/pkg/rtsp/helpers.go
+++ b/pkg/rtsp/helpers.go
@@ -70,8 +70,15 @@ func UnmarshalSDP(rawSDP []byte) ([]*core.Media, error) {
 		// Check buggy SDP with fmtp for H264 on another track
 		// https://github.com/AlexxIT/WebRTC/issues/419
 		for _, codec := range media.Codecs {
-			if codec.Name == core.CodecH264 && codec.FmtpLine == "" {
-				codec.FmtpLine = findFmtpLine(codec.PayloadType, sd.MediaDescriptions)
+			switch codec.Name {
+			case core.CodecH264:
+				if codec.FmtpLine == "" {
+					codec.FmtpLine = findFmtpLine(codec.PayloadType, sd.MediaDescriptions)
+				}
+			case core.CodecOpus:
+				// fix OPUS for some cameras https://datatracker.ietf.org/doc/html/rfc7587
+				codec.ClockRate = 48000
+				codec.Channels = 2
 			}
 		}