Hi,
Our RTSP video server reply two streams in SDP are UDP and RTP/AVP/UDP.
>> m=video 0 UDP 33
>> m=video 0 RTP/AVP/UDP 33
ffmpeg now setup twice with the same transport "RTP/AVP/UDP"
The first time is
>> SETUP rtsp://192.168.1.100:554/MOV_000012353521.mpg RTSP/1.0
>> Transport: RTP/AVP/UDP;unicast;client_port=26972-26973
And the second time is
>> SETUP rtsp://192.168.1.100:554/MOV_000012353521.mpg RTSP/1.0
>> Transport: RTP/AVP/UDP;unicast;client_port=26974-26975
After reviewing the rtsp.c, I found the bug is caused by the
acceptable string in sdp_parse_line() is "udp" only.
The transport with "udp" or "UDP" should be acceptable in sdp_parse_line().
The full rtsp negotiation is shown below.
OPTIONS rtsp://192.168.1.100:554/MOV_000012353521.mpg RTSP/1.0
CSeq: 1
User-Agent: Lavf58.35.101
RTSP/1.0 200 OK
Server: Orbit2x
CSeq: 1
Public: OPTIONS, DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, GET_PARAMETER
DESCRIBE rtsp://192.168.1.100:554/MOV_000012353521.mpg RTSP/1.0
Accept: application/sdp
CSeq: 2
User-Agent: Lavf58.35.101
RTSP/1.0 200 OK
Server: Orbit2x
CSeq: 2
Public: OPTIONS, DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, GET_PARAMETER
Content-Type: application/sdp
Content-Length: 179
v=0
o=- 60596 0 IN IP4 192.168.1.100
s=RTSP Session
t=0 0
c=IN IP4 192.168.1.100
b=AS:7984.000
a=type:vod
a=range:npt=0-5313
m=video 0 UDP 33
m=video 0 RTP/AVP/UDP 33
SETUP rtsp://192.168.1.100:554/MOV_000012353521.mpg RTSP/1.0
Transport: RTP/AVP/UDP;unicast;client_port=26972-26973
CSeq: 3
User-Agent: Lavf58.35.101
RTSP/1.0 200 OK
Server: Orbit2x
CSeq: 3
Session: 728680355;timeout=60
Transport:
RTP/AVP/UDP;unicast;destination=192.168.2.184;client_port=26972;source=192.168.1.100;server_port=10000-10001;ssrc=7b9507dd
SETUP rtsp://192.168.1.100:554/MOV_000012353521.mpg RTSP/1.0
Transport: RTP/AVP/UDP;unicast;client_port=26974-26975
CSeq: 4
User-Agent: Lavf58.35.101
Session: 728680355
RTSP/1.0 200 OK
Server: Orbit2x
CSeq: 4
Session: 728680355;timeout=60
Transport:
RTP/AVP/UDP;unicast;destination=192.168.2.184;client_port=26974;source=192.168.1.100;server_port=10000-10001;ssrc=7b9507dd
PLAY rtsp://192.168.1.100:554/MOV_000012353521.mpg RTSP/1.0
Range: npt=0.000-
CSeq: 5
User-Agent: Lavf58.35.101
Session: 728680355
RTSP/1.0 200 OK
Server: Orbit2x
CSeq: 5
Session: 728680355
Scale: 1.00
Range: npt=0-
From f9bc8db18179929c360814ebb9d8ee563810e553 Mon Sep 17 00:00:00 2001
From: "Chiu, Yung-Hsiang" <mirror...@gmail.com>
Date: Fri, 30 Jul 2021 10:07:03 +0800
Subject: [PATCH] libavformat/rtsp.c: fix RTSP not setup the UDP stream in SDP
---
libavformat/rtsp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index 9869e1b72e..dfa25ec6a4 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -509,7 +509,7 @@ static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
rtsp_st->sdp_port = atoi(buf1);
get_word(buf1, sizeof(buf1), &p); /* protocol */
- if (!strcmp(buf1, "udp"))
+ if (!av_strcasecmp(buf1, "udp"))
rt->transport = RTSP_TRANSPORT_RAW;
else if (strstr(buf1, "/AVPF") || strstr(buf1, "/SAVPF"))
rtsp_st->feedback = 1;
--
2.32.0
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