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I'm trying to make a gif out of a sequence of png format pics with python language in ubuntu 12.04. I have a file which my pictures are in it. they are named as, lip_shapes1.png to lip_shapes11.png. also I have a list with names of images in it which i want to make that gif in this sequence. the list looks like this:

list = [lip_shapes1.png, lip_shapes4.png , lip_shapes11.png, lip_shapes3.png]

but my problem is that i found this code :

import os
os.system('convert   -loop 0   lip_shapes*.gnp   anime.gif')

but it only makes gif in the order of the gnp's names, but I want it to be in any order I want. is it possible?

if anybody can help me i really appreciate it.

thanks in advance

PS: i also want to make a movie out of it. i tried this code(shapes is my list of images names):

    s = Popen(['ffmpeg', '-f', 'image2', '-r', '24', '-i'] + shapes + ['-vcodec', 'mpeg4', '-y', 'movie.mp4'])
s.communicate()

but it gives me this in terminal and doesnt work:

The ffmpeg program is only provided for script compatibility and will be removed in a future release. It has been deprecated in the Libav project to allow for incompatible command line syntax improvements in its replacement called avconv (see Changelog for details). Please use avconv instead.

Input #0, image2, from 'shz8.jpeg': Duration: 00:00:00.04, start: 0.000000, bitrate: N/A Stream #0.0: Video: mjpeg, yuvj420p, 266x212 [PAR 1:1 DAR 133:106], 24 tbr, 24 tbn, 24 tbc

shz8.jpeg is the first name on the list.

thanks

Shahrzad A
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3 Answers3

2

If you use subprocess.call, you can pass the filenames as a list of strings. This will avoid shell quotation issues that might arise if the filenames, for example, contained quotes or spaces.

import subprocess
shapes = ['lip_shapes1.png', 'lip_shapes4.png' , 'lip_shapes11.png', 'lip_shapes3.png']
cmd = ['convert', '-loop0'] + shapes + ['anime.gif']
retcode = subprocess.call(cmd)
if not retval == 0:
    raise ValueError('Error {} executing command: {}'.format(retcode, cmd))
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unutbu
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1

So you've got a list of images you want to convert into gif as a python list. You can sort it or arrange in any order you want. e.g

img_list = ['lip_shapes1.png', 'lip_shapes4.png' , 'lip_shapes11.png', 'lip_shapes3.png'] img_list.sort()

Please note that list should not be used as variable name, because it's a name of list type.

Then you can use this list in calling os.system(convert ...) e.g.

os.system('convert -loop 0 %s anime.gif' % ' '.join(img_list))

running.t
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  • i used your way, that is exactly what i wanted. – Shahrzad A Jan 29 '16 at 12:49
  • @ShahrzadA: In that case (if you think it's useful) it would be nice if you accept my post (mark tick below it) or upwote it. – running.t Jan 29 '16 at 13:25
  • do you also know how to make a mp4 from sequence of images like i mentioned before? – Shahrzad A Jan 29 '16 at 15:19
  • @ShahrzadA: you should ask separate question for that. However I believe that question would be out of scope of stackoverflow, so better place to ask would be [SuperUser](http://superuser.com) or [AskUbuntu](http://askubuntu.com). – running.t Jan 29 '16 at 22:05
0

You should be sure to handle a few things here, if you want to read a series of pngs from a folder, I recommend using a for loop to check for the ending of the file, i.e. .png, .jpg, etc. I wrote a blog post on how to easily do this (read about it here):

image_file_names = [],[]
for file_name in os.listdir(png_dir):
    if file_name.endswith('.png'):
        image_file_names.append(file_name)
        sorted_files = sorted(image_file_names, key=lambda y: int(y.split('_')[1]))

This will put all the '.png' files into one vector of file names. From there, you can loop through the files to customize the gif using the following:

images = []
frame_length = 0.5 # seconds between frames
end_pause = 4 # seconds to stay on last frame
# loop through files, join them to image array, and write to GIF called 'test.gif'
for ii in range(0,len(sorted_files)):       
    file_path = os.path.join(png_dir, sorted_files[ii])
    if ii==len(sorted_files)-1:
        for jj in range(0,int(end_pause/frame_length)):
            images.append(imageio.imread(file_path))
    else:
        images.append(imageio.imread(file_path))
# the duration is the time spent on each image (1/duration is frame rate)
imageio.mimsave('test.gif', images,'GIF',duration=frame_length)

here's an example produced by the method above:

GIF Example

https://engineersportal.com/blog/2018/7/27/how-to-make-a-gif-using-python-an-application-with-the-united-states-wind-turbine-database

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