[FFmpeg-trac] #11470(avformat:new): get_eia608_packet misparses well formed files and corrupts Close Captions since 2020

[FFmpeg]

#11470: get_eia608_packet misparses well formed files and corrupts Close Captions
since 2020
-------------------------------------+-------------------------------------
             Reporter:  Pavel        |                    Owner:  (none)
  Koshevoy                           |
                 Type:  defect       |                   Status:  new
             Priority:  critical     |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  lavf mov     |               Blocked By:
  captions                           |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by Pavel Koshevoy):

 * Attachment "20250215_100345_ffmpeg_c608_fixed.png" added.

 a screenshot of a player demonstrating the corrupted closed captions after
 the fix
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Ticket URL: <https://trac.ffmpeg.org/ticket/11470>
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