16 lines
424 B
Python
16 lines
424 B
Python
import copy
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def blink(clip, d_on, d_off):
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"""
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Makes the clip blink. At each blink it will be displayed ``d_on``
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seconds and disappear ``d_off`` seconds. Will only work in
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composite clips.
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"""
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newclip = copy.copy(clip)
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if newclip.mask is None:
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newclip = newclip.with_mask()
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D = d_on + d_off
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newclip.mask = newclip.mask.fl( lambda gf,t: gf(t)*((t % D) < d_on))
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return newclip
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