[FFmpeg-trac] #2874(avformat:open): Export image2 file name as frame metadata

[FFmpeg]

#2874: Export image2 file name as frame metadata
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             Reporter:  jlubeck      |                    Owner:
                 Type:  enhancement  |                   Status:  open
             Priority:  wish         |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  drawtext     |               Blocked By:
  image2                             |
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
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Comment (by AlexSmith):

 In the last days I've been trying to find out how metatags are populated
 when image2 reads the input files. My idea is to add a new parameter
 containing the input filename, so it could be used by drawtext filter. But
 man... What a pain! Wish me luck! Maybe I can patch image2 so that it can
 send this info to other filters and make it happen.

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Ticket URL: <https://trac.ffmpeg.org/ticket/2874#comment:16>
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