[FFmpeg-trac] #5425(avcodec:open): improve iac decoder

[FFmpeg]

#5425: improve iac decoder
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             Reporter:  ami_stuff   |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  iac         |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by ami_stuff):

 see also #3886

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Ticket URL: <https://trac.ffmpeg.org/ticket/5425#comment:2>
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