Unlike to H.264/AVC, interlace-dedicated coding in HEVC is not exist:
- No mixed frame-field interaction (like PAFF in H.264/AVC)
- No interlace scanning of transform coefficients
- No correction MVX[1] (or y-component of MV) if current and reference pictures are in different polarity (top-bottom or bottom-top).
However, in HEVC the interlace video content can be indicated (signaled in VPS/SPS and pic_timing SEI messages the latter are transmitted for every picture in the sequence). Interlace-related setting:
- in VPS/SPS set general_interlaced_source_flag=1 and general_progressive_source_flag=0. Indeed, the HEVC standard says: if general_progressive_source_flag is equal to 0 and general_interlaced_source_flag is equal to 1, the source scan type of the pictures in the CVS should be interpreted as interlaced only.
- in VPS/SPS set general_frame_only_constraint_flag=0
- in SPS VUI set field_seq_flag=1 and frame_field_info_present_flag=1. Notice that if these flags are ON then picture timing SEIs shall be present for each picture.
- transmission of Picture Timing SEI per picture with the following parameters:
- source_scan_type = 0 to indicate interlace mode
- for top field picture signal pict_struct=1 and for bottom field picture pict_struct=2
23+ years’ programming and theoretical experience in the computer science fields such as video compression, media streaming and artificial intelligence (co-author of several papers and patents).
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