[FFmpeg-trac] #10211(undetermined:reopened): Concat filter with `-re` (realtime) inputs does not keep realtimeness

[FFmpeg]

#10211: Concat filter with `-re` (realtime) inputs does not keep realtimeness
-------------------------------------+-------------------------------------
             Reporter:  Brad Isbell  |                    Owner:  (none)
                 Type:  defect       |                   Status:  reopened
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  concat       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by Cigaes):

 * status:  closed => reopened
 * resolution:  invalid =>
 * component:  avfilter => undetermined

Comment:

 No, it is not normal. If a filter input is not requesting frames, ffmpeg
 should not be reading on this input. Doing it will saturate the memory.
 Reopening, setting component to undetermined, it is possible that
 threadization of demuxers broke things severely.
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Ticket URL: <https://trac.ffmpeg.org/ticket/10211#comment:3>
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