temporally aligned ? I thought spatially aligned, and both fields coded as one frame,
so chroma will be temporally smeared.
Horizontal axis: MPEG-2: aligned on even columns, (col 0,2,4 = even),
(MPEG-1: would be aligned in-between neigbored columns 0,1 and 2,3 etc.
Vertical axis: MPEG-1 and MPEG-2: aligned midways in-between two lines.
http://www.cs.columbia.edu/~delbert/...ranscoding.pdf
https://poynton.ca/PDFs/Chroma_subsampling_notation.pdf
https://pdfs.semanticscholar.org/9ae...874539ff3d.pdf
http://dvd.sourceforge.net/dvdinfo/mpeghdrs.html
Extension header.
Sequence_Extension Byte5 Bit1, Bit2
chroma_format
GoTo H.262 Spec:
https://www.google.com/url?sa=t&rct=...A8uq_RQBzRwyCs
page 54/220 Table 6-5 chroma_format
00 = Reserved
01 = 4:2:0
10 = 4:2:2
11 = 4:4:4
Ha, found something more:
Picture_Coding_Extension Byte7 Bit0
chroma_420_type
page 63/220
"chroma_420_type – If chroma_format is "4:2:0", the value of chroma_420_type shall be the same as progressive_frame; else chroma_420_type has no meaning and shall be equal to zero."