[FFmpeg-trac] #10248(ffmpeg:new): large filtergraph yields abysmal performance

[FFmpeg]

#10248: large filtergraph yields abysmal performance
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             Reporter:  mldwrp       |                    Owner:  (none)
                 Type:  enhancement  |                   Status:  new
             Priority:  important    |                Component:  ffmpeg
              Version:  4.3.5        |               Resolution:
             Keywords:               |               Blocked By:
  performance, filter_complex,       |
  filters                            |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Elon Musk):

 Using slow aevalsrc, use anullsrc instead to generate silence.

 Using bunch of filters like trim and setpts, to do some kind of timeline
 processing.

 Note that probably whole filtergraph is a non optimized mess, like
 filtering same input and producing same output over and over again just to
 add more filters in later steps to produce something else.

 Also no explanation what is this mess supposed trying to archive.
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Ticket URL: <https://trac.ffmpeg.org/ticket/10248#comment:2>
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