For 4:1:1 we have terms and definitions in 2 topics. The topics are DVD and DVD and CD.

4:1:1 (DVD)

The component digital video format with one Cb sample and one Cr sample for every four Y samples. 4:1 horizontal downsampling with no vertical downsampling. Chroma is sampled on every line, but only for every four luma pixels (i.e., 1 pixel in a 1x4 grid). This amounts to a subsampling of chroma by a factor of two compared to luma (and by a factor of four for a single Cb or Cr component). DVD uses 4:2:0 sampling, not 4:1:1 sampling.

4:1:1 (DVD and CD)

The component digital video format with one Cb sample and one Cr sample for every four Y samples. 4:1 horizontal downsampling with no vertical downsampling. Chroma is sampled on every line, but only for every four luma pixels (i.e., 1 pixel in a 1 x 4 grid). This amounts to a subsampling of chroma by a factor of two compared to luma (and by a factor of four for a single Cb or Cr component). DVD uses 4:2:0 sampling, not 4:1:1 sampling.

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