- Pure Tiling: a frame is divided into tiles and all tiles share same slice header, offsets to each tile are signaled in the slice header. Therefore there is no need to put start codes to indicate tile starts.
- Slice-encapsulated Tiling: a frame is divided into tiles and each tile is encapsulated in its own slice (i.e. each tile is preceded by its own slice header, incl. the start code). Examples:
the option ‘–slices tiles’ in kvazaar encoder makes slice encapsulation tiling:
kvazaar -i container_352x288.yuv –input-res 352×288 –tiles 2×2 -p 30 –slices tiles –mv-constraint frametile –bitrate 500000 -o test2x2.h265
SVT-HEVC also supports slice-encapsulated tiling, there is the switch ‘-tile_slice_mode 1’ which makes each tile to be encapsulated in its own slice:
Tiles 2x1_2 (two vertical tiles and the right tile is divided into two sub-tiles
The Slice Encapsulated Tiling mode enables to create the above collages without re-encoding of input stream, only by manipulation of high-level syntax. The author has a corresponding python script to create various collages.
The requirements to the input streams are:
1) coherent resolutions
2) same SPS/PPS
3) width and height of each input stream should be divisible by 64.
4) no WPP or Tiles (hierarchical tiling not supported by HEVC).
5) Motion vectors should not cross picture boundaries, i.e. SPS flag motion_vectors_over_pic_boundaries_flag = 0 (in kvazaar there is the switch ‘ –mv-constraint frametile’).
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).
the author is looking for new job, my resume
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