[FFmpeg-trac] #7542(avfilter:new): Low encoding performance depending on input method with filter complex

[FFmpeg]

#7542: Low encoding performance depending on input method with filter complex
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  daneelveloper                      |                   Status:  new
                 Type:  defect       |                Component:  avfilter
             Priority:  normal       |               Resolution:
              Version:  git-master   |               Blocked By:
             Keywords:               |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  1            |
-------------------------------------+-------------------------------------

Comment (by daneelveloper):

 In this examples I'm splitting the input clip ''(1920x1080, 29.97 fps,
 h264 video, aac audio 48000khz stereo. Audio negligible)'' into two
 separate inputs.

 Speed values as reported by ffmpeg.exe (4.0.2)

 This one runs at 4.15x speed.

 {{{
 ffmpeg -i input.mp4 -filter_complex
 "split[v0][v1],[v0][v1]blend=extremity" -c:v mpeg4 -y output.mp4
 }}}

 And the next just goes up to 1.65x speed.

 {{{
 ffmpeg -filter_complex
 "movie=input.mp4,split[v0][v1];[v0][v1]blend=extremity" -c:v mpeg4 -y
 output.mp4
 }}}

 In the second example it's obvious the slowness comes from movie filter
 but it also states that split filter derived inputs won't improve speed.

 Thank you.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7542#comment:4>
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