FFmpeg 3.3.9
Since* 3.2
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The weave takes a field-based video input and join each two sequential fields into single frame, producing a new double height clip with half the frame rate and half the frame count.

It accepts the following option:

first_field

Set first field. Available values are:

top, t

Set the frame as top-field-first.

bottom, b

Set the frame as bottom-field-first.

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Examples

  • Interlace video using select and separatefields filter:

    separatefields,select=eq(mod(n,4),0)+eq(mod(n,4),3),weave