Prototyping 2013-11-05 (Lens Based Media)

Compression & Codecs in video

(File)Format or Container is the shipping box, codec is the goods inside the box.

Format

• determines the way audio and video streams (and other metadata) are stored inside the file
• Examples are :
  • .avi (Microsoft -> OLD)
  • .wmf (Microsoft -> Unflexible)
  • .mov (Apple -> supports a lot of codecs)
  • .ogg (Open Source -> but not very well supported by editing software)
  • .mkv (Open Source -> but not very well supported by editing software)
  • .mp4 (works on virtually all platforms)

intra- vs. interframe compression

Codec

• Intraframe compression
  • Compresses each frame (with for instance JPG compression)
  • No effective size compression
  • High Quality
  • Easily readable by edit software
  • Apple ProRes, DNxHD (Avid)

• Interframe Compression Looking at delta Frames
  • Compress BETWEEN frames
  • effective size compression
  • Not easy for edit software
  • Use for sharing -> final output
  • MPEG-2 (DVD's, hardware players), DivX (downloads), H264 (currently has best quality vs. file ratio)

FYI: Uncompressed HD video = 400GB per hour More Info [1]

Tools

• ffmpeg (ffmpegX for a Mac gui version)
• Mencoder
• Handbrake
• Mpegstreamclip
• Adobe Media Encoder

Workflow & Delivery

• what happens when you upload to youtube?

Glitch Art

Data moshing

Download Finished

• How to datamosh
• Download Finished by Mediengruppe Bitnik
• glitch your image, source code

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