If you want to extract frames from a video fast and precise, there is no better tool than the command line utility ffmpeg.
If you prefer graphical tools, you can extract images with VLC player as I showed in this video.
If you are interested in making GIF animation, I suggest you watch these two videos:
Making an animated GIF in Linux • Making an animated GIF in Linux
How to make a GIF with GIMP • How to make a GIF with GIMP
To convert viedeo to png images you need to run this command:
ffmpeg -ss 00:10 -i video-filename.mp4 -t 00:03 images-filename_%03d.png
where
-ss defines the offset from the beginning of the video
-t specifies how long the fragment should be.
-i is to provide the input video file name.
%03d - indicated to use 3 digits number. For example, the output will be like this:
images-filename_001d.png
images-filename_002d.png
images-filename_003d.png
To have have all the tools to make GIF animations from images and videos, save this playlist
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