[FFmpeg-trac] #1976(avdevice:new): dshow_read_header can return zero when it fails

[FFmpeg]

#1976: dshow_read_header can return zero when it fails
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             Reporter:  DonMoir      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avdevice
              Version:  unspecified  |               Resolution:
             Keywords:  win dshow    |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by DonMoir):

 It's critical because it will put an app to sleep forever. That is
 av_read_frame will never return.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1976#comment:3>
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