Most times the video I created would be completely broken and not in a good way! And so since them I have used semi-automated datamosh scripts for my needs, like Autodatamosh from grampajoe. Recently as part of my lecturing role at Staffordshire University I was asked to do a workshop on datamoshing. Specifically, Avidemux 2. For the unaware, Avidemux is free and open source software that can be used for editing video files.
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Datamoshing is the process of manipulating the data of media files in order to achieve visual or auditory effects when the file is decoded. In some cases the term datamoshing is used to describe this process applied to any type of media file — I like to think it applies solely to video since it results in moving images being moshed together. Regardless of the application of the term, datamoshing videos can be done quite easily with free, cross-platform tools.
Modern compressed video files have very complex methods of reducing the amount of storage or bandwidth needed to display the video. Frames which store an entire picture are called I-frames Intra-coded , and can be displayed without any additional information. When a video is encoded, or compressed, a combination of these types of frames are used. More information on frame types can be found here.
If an I-frame is corrupted, removed or replaced the data contained in the following P-frames is applied to the wrong picture. In the above video I-frames have been removed and so instead of scenes changing properly you see the motion from a new scene applied to a picture from a previous frame.
This process of corrupting, removing or replacing I-frames is a very popular video datamoshing technique and what this tutorial will focus on. Another video datamoshing technique involves selecting one or more P-frames and duplicating them multiple times consecutively. Generally the effects of datamoshing are viewed as errors, or undesirable and thus applications like Avidemux try their best to correct these errors and eliminate glitching distortion. After downloading and installing Avidemux 2.
Next click the Configure button below the Video dropdown on the left. With this setting changed the video must be saved and then reloaded for it to take effect. Save the video with a new name to indicate that the Maximum I-frame Interval has been adjusted. Open the new video, select No if Avidemux displays any warnings. Once opened, change the Video dropdown on the left side of the interface back to Copy. The first frame will most likely be an I-frame and should be left in so that the video can start properly.
In order to remove an I-frame we must select it, this is done by marking an in point and an out point, these points are referred to as A and B in Avidemux and the frames of video between these two points are considered selected. Once you have found an I-frame click on the mark A button under the slider. You should see a blue border identify the new selection, starting at the slider grip and encompassing the remaining frames in the video.
Pressing delete now would delete the current I-frame and all subsequent frames so we have to reduce the selection to only the I-frame. This is done be pressing the Right Arrow key to move to the next frame and then clicking the mark B button below the slider. The blue selection border should update to show only the I-frame selected as illustrated below.
Now that only a single I-frame is selected press the Delete key on your keyboard to remove it. To remove all the I-frames use the Up Arrow to move to the next one and repeat the removal process.
The video included in this post was datamoshed using this technique, however the audio was slowed down using traditional video editing. For those of you unable to run Avidemux 2. What exactly do you mean by data files? Have you tried renaming them to. AVI or.
Hope it will help. Mac os x el capitan Hey there! Just wondering where you got 2. Seems to be hard to find on the internet! Hey, so I get to the step where I switch it to xvid and then I save the new file. I re-open that file, but there are no I-Frames any longer. Am I doing something wrong? I switched the max to and saved it as a new file and then run into this roadblock. Perhaps post in the forums with more detail.
There are I-frames before saving as Xvid and absolutely non after? I notice that the datamoshed video has a slight green tint when editting it back into a project containing the original video footage.
The only thing that comes to mind is to use high quality input videos. Running on Windows bit and downloaded the link posted above to Avidemux. It seems as though we may need to find an older Mac that cannot be updated, just to do this single effect.
People loved my videos I did years ago and now I cannot replicate the process. Hi, it seems that with this version of Avidemux for Mac we must delete a file : Delete libxml. How do you delete this file? Hi, thanks a lot for this tutorial, works fine. I want to continue the editing in premiere pro cs6 but says the file i import its damaged, of course eheh do you know how can i import it to premiere?
Ensure that the resulting file has the. Avidemux lets you name files anything which can result in output files having the wrong extension causing issues with other software. Hi Phil, could you help us out with a datamoshed image? Thank you so much for this tutorial! Really, thnx!!!! He probably meant you have to save it as a proper video file again.
This process will add new I-frames, so you can start the whole proces again. Hi, im trying to do this with a video i made. Its multiple pictures so kind of in a sense a timelapse. When i try to do this process there are no i-frames. Similarly when i lower the i-frame interval, i get more i-frames showing, but when i delete them, the video doesent mosh.
Is this due to the video being pictures in a way? Its been saved and exported as H. Question, what about if you wanted the edited video to still have the same runtime as the original?
The glitch doesnt seem to work when i paste the previous frame to the old iframe location. With new versions of Avidemux the process described in the article no longer works. Super easy. Instructions are right on. Digital television really sucks. Now THAT is just some fantastic signal corruption. Do you think you could do a more detailed section on the other datamosh technique, creating blooms?
Your email address will not be published. What exact version of Avidemux and what operating system are you using? Looks like JPEG corruption. If a file does not have enough i frames, is there a way to go around this?
Could you elaborate a little more on this, please? Apologies for the n00b question. Took me a couple of hours but it worked, thank you very much. The data corruption aesthetic is sweet. Great tutorial, this got me started just fine. Leave a Reply Cancel reply Your email address will not be published.
Datamoshing and Deep Learning
This tutorial shows how one can process multiple video files with same settings. This is useful for cases where you have to e. AVIdemux command-line support doesn't allow you to change all possible options. But it usually works OK for simple format conversions. Since it allows you to use additional command-line tools, you can for example automate YouTube uploads after AVIdemux has processed the files. Because different operating systems and shells have different kind of filename limits, commands etc.
P-frame duplication in avidemux 2. I had thought it wasn't possible to install a version of avidemux that was old enough to use for datamoshing on Mac OS X. It turns out that that's wrong , and avidemux 2. Here's how:. Credit to this old Superusers post for having the solution. Happy moshing! Don't know how to datamosh?
How to datamosh videos
Datamoshing using Avidemux 2.7.0
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