[FFmpeg-trac] #3842(avformat:new): AAC (mp4a) DASH takes abnormally long to detect (~4 - 6s)

[FFmpeg]

#3842: AAC (mp4a) DASH takes abnormally long to detect (~4 - 6s)
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             Reporter:  viperfx  |                    Owner:
                 Type:  defect   |                   Status:  new
             Priority:  normal   |                Component:  avformat
              Version:  2.2.4    |               Resolution:
             Keywords:  mov      |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
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Comment (by cehoyos):

 Or is the issue that FFmpeg seeks to the end when opening the file?
 (Sorry but imo this isn't obvious at all from the original report.)

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Ticket URL: <https://trac.ffmpeg.org/ticket/3842#comment:8>
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