V4L2_FIELD_TOP
V4L2_FIELD_BOTTOM
V4L2_FIELD_ALTERNATE
V4L2_FIELD_TOP V4L2_FIELD_BOTTOM V4L2_FIELD_BOTTOMV4L2_FIELD_BOTTOM
v4l2_buffer.field:
Temporal order, bottom field first transmitted (e.g. M/NTSC)
V4L2_FIELD_TOP V4L2_FIELD_TOP
V4L2_FIELD_INTERLACED / V4L2_FIELD_INTERLACED_BT
V4L2_FIELD_INTERLACED_TB (misaligned)
V4L2_FIELD_SEQ_BT
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