They’re basically like P frames, except they’re a little more efficient. Essentially you can think of them as tracking where exactly pixels move.ī-frames are bidirectional predictive frames. They don’t actually contain much image data themselves but represent the abstract motion of pixels within chunks of the frame between frames. I-frames are “inter” frames, also called keyframes, which contain the entirety of the frame’s image data. However, storing every single image in a video takes up a lot of space! So these images are compressed as “frames”, with three types - I-frames, P-frames, and B-frames. Video files layer multiple images in sequence in order to make the appearance of motion. To understand I-Frame destruction (and the next section on P-frame duplication), we need to briefly cover how video compression works. I’ll show you a couple different file formats and what they look like when their data is destroyed. Different video file formats glitch in different ways depending on the video codec that was used to compress the video file. We typically do this with a hex editor, a low-level editing tool for looking at the contents of files, but I wrote a tool that can do this in a more automated way which I provide below. Here’s an example of a gif that was made by destroying the file:ĭon't look at the moon when the night is dark This will make it glitch out in crazy, unpredictable ways and can produce some really cool effects (or break your file - always keep the original copy!). With file destruction, we take any old video file and mess with its data by simply opening it and replacing random bytes with other random bytes. File destruction, I-Frame destruction, and P-frame duplication Let’s run over the fundamental concepts of all of them before we go too deep.
We datamosh because we can, and because it looks really cool. In plain English, datamoshing is an umbrella term for an array of cool effects you get by glitching, altering, or otherwise breaking the fundamental structure of video files’ data. This is a great introduction to datamoshing for beginners! What’s datamoshing?
Learn how to make video glitch art by datamoshing with a variety of tools. Making Video Glitch Art: How to Datamosh, in Plain English
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