Difference between revisions of "On2 VP4"

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m (Update samples link)
Line 2: Line 2:
* Company: [[On2]]
* Company: [[On2]]
* Samples: http://samples.mplayerhq.hu/V-codecs/VP4/
* Samples: http://samples.mplayerhq.hu/V-codecs/VP4/
This codec has source code base common with [[On2 VP3|its predecessor]] but sets version to 2.
=== Frame header ===
The same as VP3 with some extensions.
* Frame type - 1 bit
* Unused - 1 bit
* DCT Q mask - 6 bits
For frame type 0 (<code>BASE_FRAME</code>):
* version byte 0 - 8 bits
* version - 5 bits (should be 2)
* key frame type - 1 bit
* spare bits - 2 bits
* ??? - 8 bits
* ??? - 8 bits
* ??? - 5 bits
* ??? - 3 bits
* ??? - 5 bits
* ??? - 3 bits
* ??? - 2 bits


[[Category:Video Codecs]]
[[Category:Video Codecs]]
[[Category:Undiscovered Video Codecs]]
[[Category:Undiscovered Video Codecs]]

Revision as of 09:36, 16 April 2016

This codec has source code base common with its predecessor but sets version to 2.

Frame header

The same as VP3 with some extensions.

  • Frame type - 1 bit
  • Unused - 1 bit
  • DCT Q mask - 6 bits

For frame type 0 (BASE_FRAME):

  • version byte 0 - 8 bits
  • version - 5 bits (should be 2)
  • key frame type - 1 bit
  • spare bits - 2 bits
  • ??? - 8 bits
  • ??? - 8 bits
  • ??? - 5 bits
  • ??? - 3 bits
  • ??? - 5 bits
  • ??? - 3 bits
  • ??? - 2 bits