| Value | Meaning |
|---|---|
| AVCHROMA_LOC_UNSPECIFIED0 | |
| AVCHROMA_LOC_LEFT1 | < MPEG-2/4 4:2:0, H.264 default for 4:2:0 |
| AVCHROMA_LOC_CENTER2 | < MPEG-1 4:2:0, JPEG 4:2:0, H.263 4:2:0 |
| AVCHROMA_LOC_TOPLEFT3 | < ITU-R 601, SMPTE 274M 296M S314M(DV 4:1:1), mpeg2 4:2:2 |
| AVCHROMA_LOC_TOP4 | |
| AVCHROMA_LOC_BOTTOMLEFT5 | |
| AVCHROMA_LOC_BOTTOM6 | |
| AVCHROMA_LOC_NB7 | < Not part of ABI |
Location of chroma samples.
Illustration showing the location of the first (top left) chroma sample of the image, the left shows only luma, the right shows the location of the chroma sample, the 2 could be imagined to overlay each other but are drawn separately due to limitations of ASCII
1st 2nd 1st 2nd horizontal luma sample positions v v v v ______ ______ 1st luma line > |X X ... |3 4 X ... X are luma samples, | |1 2 1-6 are possible chroma positions 2nd luma line > |X X ... |5 6 X ... 0 is undefined/unknown position