Joint Collaborative Team on Video Coding (JCT-VC)
of ITU-T SG16 WP3 and ISO/IEC JTC1/SC29/WG11 Document: JCTVC-J0564
10th Meeting: Stockholm, SE, 11 – 20 July 2012 Title:

Cross-check of JCTVC-J0199: Comments on DPB size

Status: Input Document to JCT-VC
Purpose: Cross-check
Author(s):

David Flynn

davidf@rd.bbc.co.uk

Source: BBC R&D

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Summary

The proposal requests to permit a greater number of reference pictures for practical applications, such as accommodating loss management policies in systems with long round-trip-times.

Two alternatives are proposed, both with text. Either —

1. increase the maximum DPB size to 16 for all levels, or
2. permit AVC-style picture size dependent DPB occupancy limits to a maximum of 16 pictures.

Comments

Both proposals permit a maximum of 16 pictures to be used¹, although the memory requirements of (a) might be deemed excessive.

Option (b) takes into account the desire of [2] to reduce the DPB size. The effective size for each level is five times the corresponding MaxLumaFS (which includes the current picture). While one may increase the level to counter this, the availability of four reference pictures may be quite limiting.

References