Well I understand that:
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--interlaced Enable pure-interlaced mode (tff)
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enable interlacing with top field first by default
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--tff Alias for --interlaced
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exactly the same command than --interlaced
Quote:
--bff Enable pure-interlaced mode (bff)
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enable interlacing with bottom field first by default
In fact --interlaced command here is useless. you must just know if your interlaced source is bff or tff.