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My goal is to edit a video automatically, so that there are small parts reapeating in forward and backward motion with variable part lengths. The sequence of frames for part length 1 would be: 1 2 3 2 3 4 3 4 5 Part length 2: 1 2 3 2 1 2 3 4 3 2 3 4 5 A friend provided me with an array, which can generate this and other sequences.

#!/usr/bin/python
# coding: utf8
amplitude = 5 #Min 1  
end = 30 
drunkenArr = []
i = 0
while i <= end - amplitude + 1:
    for j in range(amplitude):
        drunkenArr.append(i + j)
    for j in range(amplitude)[::-1][1:-2]:
        drunkenArr.append(i + j)
    i = i + 1
print drunkenArr

There could be multiple ways: - Opening a video file on consecutive frames and setting frame start to this sequence. This one will be very slow I think. - Opening one video file and cut and copy the frames after a pattern - converting the video file to single images and putting them into a folder ( could be done by hand, but with a script it would be much more convenient) and importing them in the sequence of an array.

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    $\begingroup$ Mention to your friend blender uses python 3.6 $\endgroup$
    – batFINGER
    Commented May 20, 2018 at 11:48
  • $\begingroup$ Also the VSE can perform a speed effect that will read frames forwards and backwards but not out of order. It will perform frame skipping if in excess of 100% speed $\endgroup$
    – 3pointedit
    Commented Jul 21, 2018 at 3:30

1 Answer 1

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Perhaps try this:

import os

from bpy import context
scene = context.scene

path = "C:/Users/Admin/Documents/Projects/VIDEO/atabilized/timelapse"
files = os.listdir(path)
files.sort()

# create the sequencer data
scene.sequence_editor_create()

seq = scene.sequence_editor.sequences.new_image(
    name="MyStrip",
    filepath=os.path.join(path, files[0]),
    channel=1, frame_start=1)

# add the images. forward and backwards
amplitude = 25
i=0
while i <= files.len() - amplitude:
    for f in files[i : i + amplitude]: #forward
        seq.elements.append(f)
    for f in files[i + 2 : i + amplitude - 1 ][::-1] #backwards
        seq.elements.append(f)
    i += 1
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