Sophisticated usage of contextual probabilities.Installed ffmpeg and chacked on some samples here and there. VP8 augments these basic concepts with, among other things, The human visual system to moderate losses of fidelity in the Of both spatial coherence in the original signal and the tolerance of Segregation provided by the DCT and WHT facilitate the exploitation Prior frame than it is to specify pixel values. It is moreĮfficient to specify the location of a visually similar portion of a Temporal and spatial coherence of most video signals. Roughly speaking, such systems reduce datarate by exploiting the (hereafter abbreviated as WHT) instead of a DCT. One special case, however, VP8 uses a "Walsh-Hadamard" transform Using a discrete cosine transform (hereafter abbreviated as DCT). Of such predictions (as well as synthesis of unpredicted blocks) Of such subblocks using previously constructed blocks, and adjustment Like many modern video compression schemes, VP8 is based onĭecomposition of frames into square subblocks of pixels, prediction
Theīitstream is defined by the reference source code and not this If thereĪre any conflicts between this narrative and the reference sourceĬode, the reference source code should be considered correct. Reference decoder source code provided in Attachment One. It is intended to be used in conjunction with and as a guide to the Internet-Draft VP8 Data Format and Decoding Guide June 2011 1. Internet-Draft VP8 Data Format and Decoding Guide June 2011 20.24.
Attachment One: Reference Decoder Source Code. Bounds on and Adjustment of Motion Vectors. Interframe Macroblock Prediction Records. Internet-Draft VP8 Data Format and Decoding Guide June 2011 14.4. DCT and WHT Inversion and Macroblock Reconstruction. Remaining Frame Header Data (non-Key Frame).
Token Partition and Partition Data Offsets. Color Space and Pixel Type (Key Frames-only). Internet-Draft VP8 Data Format and Decoding Guide June 2011ġ. Please review these documentsĬarefully, as they describe your rights and restrictions with respect This document is subject to BCP 78 and the IETF Trust's Legal This Internet-Draft will expire on December 17, 2011.Ĭopyright (c) 2011 IETF Trust and the persons identified as the Material or to cite them other than as "work in progress." It is inappropriate to use Internet-Drafts as reference Internet-Drafts are draft documents valid for a maximum of six monthsĪnd may be updated, replaced, or obsoleted by other documents at any Note that other groups may also distribute
Internet-Drafts are working documents of the Internet Engineering
This Internet-Draft is submitted in full conformance with the Together with a discussion of the decoding procedure for the format. This document describes the VP8 compressed video data format, VP8 Data Format and Decoding Guide draft-bankoski-vp8-bitstream-03