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Chroma format to use when capturing to H.264.

'auto' : picks the best quality option.
4:4:4 : Chroma is at full resolution.
         This provides the best quality, however
         not widely supported by editing software.
4:2:2 : Chroma is at half horizontal resolution.
4:2:0 : Chroma is at quarter resolution, which may
          cause minor color smearing.

However, this chroma format is most likely to be compatible with video editing software.

Possible values: auto, 4:4:4, 4:2:2, 4:2:0.
