Unlike the concat.py, this updated version takes an input video file name and generates i-frames for us. The concat2.py file is a modified version of concat.py. Slideshow_name = 'yosemite_with_fades.mp4'

# concatenate the slides in the list file M.make_slideshow_list(fade_slides, listname) S = m.add_fade_effect(slide, outfile_name) If item.startswith('yi') and item.endswith('.png'):

# concat all slides in the slideshow listĭef concat_slides(self, slideshow_name = 'my_slideshow.mp4' ): With open(self.slideshow_list_filename, mode='wb') as f: Slide_name = outfilename+str(unt)+'.mp4'ĭef make_slideshow_list(self, slides, fname='mylist.txt'): #ffmpeg -i slide_fade_in.mp4 -y -vf fade=out:120:30 slide_fade_in_out.mp4 # add fade-out effect to the slide that has fade-in effect already : 30 frames starting from 120th #ffmpeg -i slide.mp4 -y -vf fade=in:0:30 slide_fade_in.mp4Ĭmd = # add fade-in effect - from 0th to 30th frame # This is done by copying one I-Frame for a slideĬmd = map(lambda x: '%s' %x, )

# Makes two frames : at the beginning and at the end Self.slideshow_list_filename = 'mytext.txt'ĭef add_fade_effect(self, infilename, outfilename = 'final'): By default it doesn't take any parameters, so we can just run the file: 'python concat.py' :

It makes a slide list, and then use it to concatenate all the slides to create 'yosemite_with_fades.mp4' file.

It puts fade effect into each frame as we've done in Transitions : python script for fade-in & fade-out with two slides.

The following code will make a slideshow from 116 I-frames we made earlier.

Ffmpeg concat each file as chapter