Cfxtrjtrk

I want make a .gif animated picture from a given set of .jpg pictures.

I would prefer to do it from the command line, so command line tools would be very welcome.

You can use ImageMagick package. Install it using the command:

sudo apt-get install imagemagick

Now you can create a gif from number of pictures(jpg) using:

convert -delay 20 -loop 0 *.jpg myimage.gif

To complete @Maythux answer:

To avoid generating a very large file, you can use -resize option:

In my case, I have 4608x3456 images and the generated gif was more than 300M for 32 images

convert -resize 20% -delay 20 -loop 0 *.jpg myimage.gif

or

convert -resize 768x576 -delay 20 -loop 0 *.jpg myimage.gif

Take care of *.jpg

*.jpg sucks a bit when dealing with numeric values, you may generate a gif with unsorted pics.

$ ls|cat

21-33-26_1.jpg

21-33-26_10.jpg   // <--- this one

21-33-26_2.jpg

21-33-26_3.jpg

21-33-26_4.jpg

21-33-26_5.jpg

21-33-26_6.jpg

21-33-26_7.jpg

21-33-26_8.jpg

21-33-26_9.jpg

21-33-28_1.jpg    // <--- should be here    

21-33-28_2.jpg

21-33-28_3.jpg

...

As the shots were taken very quickly (10/s) they all have the same modification time and you can't trick using ls -t for example. On ubuntu you can use ls -v instead, something like:

convert -resize 768x576 -delay 20 -loop 0 `ls -v` myimage.gif

Sorting numerically is quite tricky on Mac OS X though, I guess you'll need to build a custom script.

I don't have enough reputation to comment but instead of modifying file names you can use globbing to get your shell to expand file names

convert -resize 50% -delay 10 -loop 0 image_{0..99}.jpg output.gif

ffmeg solution with test data

wget -O opengl-rotating-triangle.zip https://github.com/cirosantilli/media/blob/master/opengl-rotating-triangle.zip?raw=true

unzip opengl-rotating-triangle.zip

cd opengl-rotating-triangle

ffmpeg 

  -framerate 60 

  -pattern_type glob 

  -i 'tmp.*.png' 

  -r 15 

  -vf scale=512:-1 

  out.gif 

;

The test data was generated with: https://stackoverflow.com/questions/3191978/how-to-use-glut-opengl-to-render-to-a-file/14324292#14324292

The important ffmpeg options I wanted to highlight are:

• 
  -patter_type glob: convenient way to select images


• 
  -framerate 60 and -r 15: assume 60 FPS on input images (ffmpeg cannot know otherwise since no FPS data in images as in video formats), pick one every 4 images so reduce size (4 == 60 / 15)


• 
  -vf scale=512:-1: set the width, scale height proportionally, usually to reduce size and save space

See also:

• video from images: https://stackoverflow.com/questions/24961127/how-to-create-a-video-from-images-with-ffmpeg/37478183#37478183
  


• GIF from video: How to create an animated GIF from MP4 video via command line?
  

Tested in Ubuntu 18.10, ffmpeg 4.0.2.