"ERR: path has changed" from Android VLC

[JC-85]

Which version are you using?

v0.9.15

Which operating system are you using?

Windows

Describe the problem

When connecting to the port with VLC (3.2.12) on Android I receive the following error message, and the connection fails:

2020/10/04 00:28:16 [2/0/0] [client [::1]:52111] connected
2020/10/04 00:28:16 [2/0/0] [client [::1]:52111] OPTIONS
2020/10/04 00:28:16 [2/0/0] [client [::1]:52111] ANNOUNCE
[udp @ 000001d238191640] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
[udp @ 000001d238191e40] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
2020/10/04 00:28:16 [2/0/0] [client [::1]:52111] SETUP
2020/10/04 00:28:16 [2/0/0] [client [::1]:52111] RECORD
2020/10/04 00:28:16 [2/0/0] [client [::1]:52111] is publishing on path 'ch0', 1 track via udp
Output #0, rtsp, to 'rtsp://localhost:8554/ch0':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #0:0: Video: mpeg4, yuv420p, 1280x720, q=2-31, 200 kb/s, 30 fps, 90k tbn, 30 tbc
    Metadata:
      encoder         : Lavc58.54.100 mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
2020/10/04 00:28:16 [2/1/0] [client 192.168.2.34:39856] SETUP
2020/10/04 00:28:16 [2/1/0] [client 192.168.2.34:39856] PLAY
2020/10/04 00:28:16 [2/1/0] [client 192.168.2.34:39856] is receiving on path 'ch0', 1 track via udp
2020/10/04 00:28:16 [2/1/1] [client 192.168.2.34:39856] TEARDOWN
2020/10/04 00:28:16 [1/1/0] [client 192.168.2.34:39856] disconnected
2020/10/04 00:28:16 [2/1/0] [client 192.168.2.34:39858] connected
2020/10/04 00:28:16 [2/1/0] [client 192.168.2.34:39858] SETUP
2020/10/04 00:28:16 [2/1/0] [client 192.168.2.34:39858] PLAY
2020/10/04 00:28:16 [2/1/0] [client 192.168.2.34:39858] ERR: path has changed, was 'ch0', now is 'ch0/trackID=0'
2020/10/04 00:28:16 [1/1/0] [client 192.168.2.34:39858] disconnected

Connecting to rtsp-simple-server from VLC (3.0.11) on Windows works without any problems. Connecting to other RTSP streams using the same Android device also works without issues.

[aler9]

Hello, i've tested this exact setup (rtsp-simple-server on Windows, VLC on Android on different machine) but everything worked and i was not able to replicate the issue.

In my opinion, there's a firewall between the machine and the device that blocks UDP connections; if there's a firewall, VLC sends a TEARDOWN request after 10 seconds, and then try with TCP, but in this case the teardown happens instanteously:

2020/10/04 00:28:16 [2/1/0] [client 192.168.2.34:39856] is receiving on path 'ch0', 1 track via udp
2020/10/04 00:28:16 [2/1/1] [client 192.168.2.34:39856] TEARDOWN

There should be a delay of 10 seconds between these two lines.
Please try again and attach another log.