Combining two animated gifs using JavaScript: A step-by-step guide

In my current project, I have developed a web application that allows users to upload animated gifs. Through this application, users can place the gifs on the webpage using <img> tags and move them around as they please. After the user finishes arranging the gifs, the task at hand is to export the result into one gif file that incorporates all the uploaded gifs.

For instance, if a user uploads two animated gifs and positions them side by side on the webpage, I need to merge them into a single gif file where both gifs are displayed together.

One idea I have been contemplating involves extracting the frames from each uploaded gif, combining the frames from each gif into a single frame (e.g., result_frame_1 = gif1_frame_1 + gif2_frame1, result_frame_2 = gif1_frame_2 + gif2_frame2, and so on), and then rearranging these frames to create the new gif.

Because this process needs to be executed using JavaScript, I am seeking libraries that could assist with this task. Essentially, I require a library that can extract frames from a gif, manipulate them, and reconstruct a gif from the modified frames.

javascriptgif

Answer №1

At the moment, there are no specific libraries available for this task. However, you can utilize ffmpg wasm to retrieve frames from a GIF or any other frame extractors. Proceed by passing these frames to a canvas imagedraw and looping through each GIF frame individually (by drawing the first frame of the first GIF, then the first frame of the second GIF, and so on for all frames). Afterwards, combine the resulting frames to create a new GIF using ffmpg.

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