In this case, we are sending the image data we just obtained by taking screenshot. Screenshot() function called every 100ms and it returns the image buffer, () allow us to write data directly to the child’s stdin buffer.
This is actually what we want to accomplish in Node.js in the end. We used cat to read images as raw data and piped to FFmpeg using the | operator. img/* | ffmpeg.exe -framerate 1 -f image2pipe -i - output.mp4 Since the code above taking inputs from stdin we can use: cat. img folder and we want to generate video from these while each frame has a 1-second duration. ffmpeg.exe -framerate 1 -f image2pipe -i - output.mp4 The following FFmpeg code is used to produce a slideshow from images provided to stdin. I use the FFmpeg standalone executable and not any Node API wrapper. I used the screenshot-desktop module to capture screenshots of my desktop and return a buffer, I used that package to generate images and this is not an essential part of this tutorial instead you can read those images from disk as well.
learn moreįFmpeg obviously has many features but we are only interested in one right now. FFmpegĪ complete, cross-platform solution to record, convert and stream audio and video. We will make a simple Node.js app that generates an mp4 video from screenshots taken by our program, directly from the buffer without saving those images on disk. Both are streams in Node.js while stdin is a writable stream and stdout is a readable stream. We are interested in stdin and stdout streams in this tutorial. Recently I spent a lot of time with child processes and decided to write a simple tutorial about that, and if you intend to use child processes you better know more about streams.Ī stream is an abstract interface for working with streaming data in Node.js
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