A Workshop
Human Body: Professor Laila Shereen Sakr
Data Body: @vj_um_amel
Categories: cyborg, artist, professor, activist, techie, mom, partner
Encoding 101
Encoding 101
Containers
Compression
Encoding 101
How the file is algorithmically compressed
Encoding 101
How the file is algorithmically compressed
Encoding 101
Containers - The file that is output after compression
H.264
JPEG
VP2
VP3
Encoding 101
.mov
.mp3
.mp4
.swf
A complex technique where the movement in one layer of video is applied to another layer of footage, using lossy compression and removed frames to create a glitchy, psychedelic result. Think of what it looks like when your Netflix stream is dragging and creates a ghost image transition.
The various algorithmic video frames
If an I-frame is corrupted, removed or replaced the data contained in the following P-frames is applied to the wrong picture. For example, if 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. This results in the same P-frame data being applied to one picture over and over again, accentuating the movement and creating what’s known as a Bloom effect.
Frame by frame method (originally performed using Avidemux 2.54). Download:
Scripting method (also in Ruby and Phython). We will use the AE Datamosh plugin. Download:
Various methods can be found here.
@vj_um_amel
By VJ Um Amel
The War, Security, and Digital Media Graduate Working Group - UCSB
