Supporting Interlacing
You might be forgiven for thinking that no one uses interlaced video any more: a large percentage of the world has already switched from CRT to display technologies such as LCD or Plasma. However, a lot of productions still use interlaced video, in particular live TV. Most video cameras on the market today still have interlaced video modes. H.265/HEVC was designed for progressive scan but you can still encode fields with it. Interlacing is alive and well and will probably be around for a little while longer at least.
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