V4L2_FIELD_TOP
V4L2_FIELD_BOTTOM
V4L2_FIELD_ALTERNATE
v4l2_buffer.field:
V4L2_FIELD_TOP V4L2_FIELD_BOTTOM V4L2_FIELD_TOP V4L2_FIELD_BOTTOM V4L2_FIELD_TOP V4L2_FIELD_BOTTOM
Temporal order, top field first transmitted (e.g. BG/PAL)
V4L2_FIELD_SEQ_TB
V4L2_FIELD_INTERLACED_BT (misaligned)
V4L2_FIELD_INTERLACED / V4L2_FIELD_INTERLACED_TB
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