Slideshow for the VSE

slideshow.py

import bpy
import os

def make_transition(seq, s1, s2):
    effect = seq.sequences.new_effect(name="Cross", channel=3, frame_start=s2.frame_final_start, frame_end=s1.frame_final_end, type='GAMMA_CROSS', seq1=s1, seq2=s2)


def create_slide_show(scn, dirname):

    if scn.sequence_editor is None:
        scn.sequence_editor_create()

    fr0 = 1
    nframes=90
    overlap = 30
    i=0
    prevStrip = None
    for basename in sorted(os.listdir(dirname)):
        if os.path.splitext(basename)[1] in {'.jpg', '.png', '.bmp', '.tif', '.exr'}:
            if 0 == i%2:
                ch = 1
            else:
                ch = 2
            strip = scn.sequence_editor.sequences.\
                new_image(name=basename,  filepath=os.path.join(dirname, basename), channel=ch, frame_start=fr0)
            strip.frame_final_duration = nframes+ overlap

            if prevStrip is not None:
                make_transition(scn.sequence_editor, prevStrip, strip)

            prevStrip = strip
            fr0 = fr0 + nframes
            i=i+1


create_slide_show(bpy.context.scene, "C:\\Users\\user\\Desktop\\")