SeparateFields
(clip)
NTSC and PAL video signals are sequences of fields, but all capture cards that I'm aware of capture two fields at a time and interlace (or "weave") them into frames. So frame 0 in the capture file contains fields 0 and 1; frame 1 contains fields 2 and 3; and so on. SeparateFields
takes a frame-based clip and splits each frame into its component fields, producing a new clip with twice the frame rate and twice the frame count. This is useful if you would like to use Trim
and similar filters with single-field accuracy.
SeparateFields
uses the field-dominance information in the source clip to decide which of each pair of fields to place first in the output. If it gets it wrong, use ComplementParity
, AssumeTFF
or AssumeBFF
before SeparateFields
.
From version 2.5.6 this filter raises an exception if the clip is already field-based. You may want to use AssumeFrameBased
to force separate a second time. Prior versions did a no-op for materials that was already field-based.
$Date: 2006/12/14 22:55:04 $