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M11956: Memory Management Control Operation for picture duplication

This paper discusses memory management control operations for duplicating pictures in the encoder and decoder processes. It proposes the use of a new MMCO command for frame duplication to ensure conformance between the encoded bitstream and a decoder with limited memory.

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M11956: Memory Management Control Operation for picture duplication

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  1. M11956: Memory Management Control Operation for picture duplication Panasonic Singapore Laboratories ChinPhek Ong

  2. MCTF • Lowpass picture of the current GOP is used as reference picture for the next GOP. • In the decoder, this lowpass picture needs to be duplicated and stored in the memory. • Otherwise, the contents will be overwritten when inverse MCTF is performed.

  3. MCTF Inverse MCTF will overwrite content Use as reference for next GOP Picture is duplicated before it is overwritten

  4. Low Delay Mode • Referring to M11616, in real low delay situation, encoding and decoding is performed partition by partition. • Inter-partition reference pictures need to be duplicated and stored in memory

  5. Low Delay Mode Need to be duplicated during decoding

  6. WD Editorial Note 8 • To some extent, this problem is mentioned in the WD, editorial note 8. • For key pictures (identified by the variable KeyPicture) for which progressive refinement NAL units are present, we need to store a second representation, which is needed for enabling the closed loop coding between successive key pictures. These representations shall be marked as “base representation” and shall be chosen in the reference picture selection process, when KeyPicture is equal to 1 and such a representation exists. It need to be specifiedwhen such a representation needs to be stored in addition to the “normal” picture, and when it is used for motion-compensated prediction.

  7. MMCO for duplication • To ensure conformance between encoded bitstream and a decoder having finite amount of memory, MMCO is used. • A new MMCO command for frame duplication is proposed.

  8. Semantics – Proposed change • Table 7-9 subclause S.7.4.3.3

  9. Syntaxes – Proposed change

  10. Decoding Process – Proposed change

  11. Conclusion • Picture duplication is required for inverse MCTF. • We proposed using a newly defined MMCO command to perform duplication.

  12. Q & A • Thank You!

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