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excessively slow image animation

From: Evgeny Zajcev
Subject: excessively slow image animation
Date: Wed, 13 Feb 2019 17:39:38 +0300

I've got multi frame image at http://lgarc.narod.ru/giphy.mp4

And run next code on it:

  (let ((ctime (float-time)))
    (setq img (create-image "~/tmp/giphy.mp4" 'imagemagick nil :scale 1.0))
    (insert-image img)
    (cl-dotimes (index 65)
      (image-show-frame img index 'nocheck)
      (sit-for 0.0))
    (- (float-time) ctime))
  ==> 18.788017988204956

18 seconds to show every frame

Then I simple converted the file to set of bmp files:

  $ time convert ~/tmp/giphy.mp4 ~/tmp/anim1/giphy%05d.bmp
  convert ~/tmp/giphy.mp4 ~/tmp/anim1/giphy%05d.bmp  0,18s user 0,10s system 117% cpu 0,237 total
And animated on these bmp files:

  (let ((ctime (float-time)))
    (setq img (create-image "~/tmp/anim1/giphy00000.bmp" 'imagemagick nil :scale 1.0))
    (insert-image img)
    (cl-dotimes (index 65)
      (plist-put (cdr img) :file (format "~/tmp/anim1/giphy%05d.bmp" index))
      (sit-for 0.0))
    (- (float-time) ctime))
  ==> 1.3518333435058594

Now I use method with bmp files.  I would like to use built in `:index' image property to animate images, however current animation speed is totally not acceptable.  Can this be fixed, or am I doing something wrong?


EMACS: GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.18.9) of 2018-11-13
IM: Version: ImageMagick 6.8.9-9 Q16 x86_64 2018-09-28 http://www.imagemagick.org


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