[FFmpeg-trac] #5970(undetermined:new): No valid multicast port obtained from RTSP

[FFmpeg]

#5970: No valid multicast port obtained from RTSP
-------------------------------------+-------------------------------------
             Reporter:  ioeir2       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 Cannot get multicast RTSP stream from camera via ffmpeg/ffplay.
 ffmpeg/ffplay tries to connect to UDP port 0 instead of 40000.

 It sends in SETUP:
 Transport: RTP/AVP/UDP;multicast
 But should something like
 Transport: RTP/AVP;multicast;destination=224.1.2.4;port=40000-40001

 How to reproduce:
 IP camera: Amcrest IPM-HX1, sw. version 2.420.AC00.15.R, build :
 2016-09-08. Very popular at the moment IP camera.

 {{{
 ./ffplay-3.2 -rtsp_transport udp_multicast
 'rtsp://admin:password@10.0.1.20/cam/realmonitor?channel=1&subtype=0&proto=Dahua3&unicast=false'
 ffplay version 3.2 Copyright (c) 2003-2016 the FFmpeg developers
   built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
   configuration:
   libavutil      55. 34.100 / 55. 34.100
   libavcodec     57. 64.100 / 57. 64.100
   libavformat    57. 56.100 / 57. 56.100
   libavdevice    57.  1.100 / 57.  1.100
   libavfilter     6. 65.100 /  6. 65.100
   libswscale      4.  2.100 /  4.  2.100
   libswresample   2.  3.100 /  2.  3.100
 [udp @ 0x7fb20bc9d500] bind failed: Permission denied    0B f=0/0
 [udp @ 0x7fb20bc9b1a0] bind failed: Permission denied
 [udp @ 0x7fb20bc9b220] bind failed: Permission denied
 Segmentation fault: 11
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/5970>
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