[FFmpeg-trac] #11571(undetermined:new): Unexpected shell variable overwrite with `read` and `ffmpeg`

[FFmpeg]

#11571: Unexpected shell variable overwrite with `read` and `ffmpeg`
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             Reporter:  Jimmy Leung  |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  7.1          |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Cigaes):

 ffmpeg reads commands on its standard input. You can disable that with
 `-nostdin`.
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Ticket URL: <https://trac.ffmpeg.org/ticket/11571#comment:4>
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