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Frederic Barbier authored
A frame should be referenced with a unique delta, which is not guaranteed when diff_len is greater than frame_id_length. Otherwise, it's possible to get into a situation where a frame can be referenced with many different delta_frame_id values, although the decoder only accepts one of them. Avoid ambiguities when delta-referencing a frame, and avoid wasting bits by using a coding enforcing the restriction. Change-Id: If7c611c9b6ec69662c5af540ade59f08bacda2ba
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