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Summary

BIFS-Anim is a streaming protocol used to control MPEG-4/BIFS scene animation. It can be thought of as a mechanism for dynamically altering node field values over a network connection. BIFS-Anim behaves like a video or audio streaming protocol, in that a header (the anim mask) is first sent to configure the BIFS-Anim decoder, after which frames are sent at a specified frame rate (frames contain values for fields that have been declared animated in the mask and that are animated in these frames).

Although they appear to be separate protocols, both BIFS-Anim and BIFS-Command utilize the same BIFS decoder (the anim mask is stored in the BIFS-Command decoder). While quantization is not necessary in the BIFS-Command protocol, it is mandatory in BIFS-Anim (BIFS-Anim uses an adaptive arithmetic encoder to store the quantized values in the bitstream).


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