[FFmpeg-trac] #3857(avformat:new): Duration does not update with growing files

[FFmpeg]

#3857: Duration does not update with growing files
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             Reporter:  gjdfgh    |                     Type:  enhancement
               Status:  new       |                 Priority:  wish
            Component:  avformat  |                  Version:  git-master
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 libavformat apparently never updates the duration field after opening a
 file. This not so nice if the file is downloaded concurrently, and the
 duration is calculated from the file size (like it's done with .ts).

 It would be nice if there was an API function to update the duration
 calculations, or any other "standard" way.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3857>
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