[FFmpeg-trac] #9115(undetermined:new): ffmpeg rtsp with port forwarding fail when specifying target port

[FFmpeg]

#9115: ffmpeg rtsp with port forwarding fail when specifying target port
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             Reporter:  ghylander    |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug:
 When using a pc as a bridge between the target source of rtsp stream, and
 the device where ffmpeg is executed, when specifying a port the execution
 will fail with error "Invalid data found when processing input". This does
 not happen if the port is removed (which leads to unauthorised).

 How to reproduce:
 The setup i have is a network camera. I have a pc that can, through a vpn,
 access said camera. I have a 3rd device where i execute ffmpeg. On the pc,
 i forward all traffic inconming to port 9000 to the camera's port 554.
 Ffmpeg will fail to connect to the camera this way.

 {{{
 ffmpeg -y -i rtsp://user:pass@IP:port -filter fps=fps=1 -updatefirst 1
 /var/www/html/cache/raw.jpg
 ffmpeg version: 3.4.8
 built on ubuntu
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/9115>
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