### Install AviGlitch Gem

Source: https://ucnv.github.io/aviglitch

Install the AviGlitch library using RubyGems. Ensure Ruby is installed first.

```bash
$ sudo gem install aviglitch
```

--------------------------------

### Datamosh AVI Files using Command Line

Source: https://ucnv.github.io/aviglitch

Use the `datamosh` command-line tool provided by the AviGlitch gem to remove keyframes from an AVI file without writing Ruby code.

```bash
$ datamosh file.avi
```

--------------------------------

### Randomize Screen Size Data in Keyframes

Source: https://ucnv.github.io/aviglitch

This Ruby code overwrites the screen size data of keyframes in an AVI file with random values, potentially causing playback issues with certain players/codecs. Requires the 'aviglitch' gem.

```ruby
require 'aviglitch'

a = AviGlitch.open 'file.avi'
a.glitch_with_index(:keyframe) do |data, i|
  x = data[25..28].unpack('B*').first
  w = rand(('0b' + x[0..12]).oct * 1.5)
  h = rand(('0b' + x[14..26]).oct * 1.5)
  x[0..12] = "%013b" % ((w > 50) ? w : 50)
  x[14..26] = "%013b" % ((h > 50) ? h : 50)
  (i == 0) ? data : data[0..24] + [x].pack('B*') + data[29..data.size]
end
a.output 'out.avi'
```

--------------------------------

### Repeat Frames in AVI Files

Source: https://ucnv.github.io/aviglitch

This Ruby code manipulates frames in an AVI file, collecting delta frames and repeating a selected non-keyframe multiple times to create a glitch effect. Requires the 'aviglitch' gem.

```ruby
require 'aviglitch'

a = AviGlitch.open 'file.avi' 
d = []
a.frames.each_with_index do |f, i|
  d.push(i) if f.is_deltaframe?
end
q = a.frames[0, 5]
100.times do
  x = a.frames[d[rand(d.size)], 1]
  q.concat(x * rand(50))
end
o = AviGlitch.open q
o.output 'out.avi'
```

--------------------------------

### Datamosh AVI Files by Removing Keyframes

Source: https://ucnv.github.io/aviglitch

This Ruby code removes keyframes from an AVI file to create a datamoshing effect. Returning nil in the glitch block removes the frame. Requires the 'aviglitch' gem.

```ruby
require 'aviglitch'

a = AviGlitch.open 'file.avi' # Rewrite this line for your file.
a.glitch :keyframe do |f|
  nil 
end 
a.output 'out.avi'
```

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