You may get some interesting effects by keeping some I-Frames, eg. Best thing to do is probably put the audio on after you've finished.Ĥ. As you are removing video frames, you'll also loose audio sync over time. Should go without saying, but keep a backup of your original video before you start.ģ. This is very important if you want to then upload to YouTube as it will probably not accept a broken video.Ģ. When you do this the visual effect you created by removing the I-Frames will be preserved, but VLC will insert new I-Frames so that all video players understand how to play it back (some throw a fit when they do not find the data they expect, others like VLC will carry on regardless). After removing the I-Frames with this technique, the first thing you should do is use something like VLC to convert it back into an un-broken format. NOT ALL VIDEO PLAYERS WILL LIKE YOU DOING THIS! It is a hack afterall, what you're really doing is breaking the video. I think you can just hold delete until all the data is gone, and the next 00dc, or 00wb moves into its place.ġ. An I-Frame can be identified by the HEX string 00 01 B0 01 that will appear about 5 bytes after the 00dc frame start marker.Ĥ. About 1 in 25 of these will be an I-Frame (though this depends on things like what quality you saved it at, etc). This is the raw video data.Įach video frame in the AVI file will start with the code 00dc, you can search for these in the file (there will be a lot!). ( is good, and free) You'll see a lot of numbers and symbols. Download a HEX editor and open the AVI file with it. Get your video in MPEG4 format, XViD or DIVX is fine.ģ. Here is how you can do it the hardcore way:ġ.
The effect you see in the datamosh videos is what happens when you store only the differences between frames, ie. They store only the differences between the current frame and the last frame. P and B frames are the smart frames that allow videos to be compressed. An I frame is like a JPEG image, it holds the still image (that frame) in its entirety. When a video is encoded, each frame is stored as an I frame or a P/B frame.
Vectorpunk Īlthough I just learned that Datamoshing is over, I want to quickly describe how you can make it happen, to late.
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