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DOCS/options: update lavfi-complex examples
Show how to stack 3 or more videos, and remove the life filter example because it should be used with av://lavfi:life.
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@ -7307,11 +7307,11 @@ Miscellaneous
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to fix the size).
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To load a video track from another file, you can use
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``--external-file=other.mkv``.
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- ``--lavfi-complex='[vid1] [vid2] [vid3] hstack=inputs=3 [vo]'``
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Use the inputs option to stack more than 2 tracks.
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- ``--lavfi-complex='[aid1] asplit [t1] [ao] ; [t1] showvolume [t2] ; [vid1] [t2] overlay [vo]'``
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Play audio track 1, and overlay the measured volume for each speaker
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over video track 1.
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- ``null:// --lavfi-complex='life [vo]'``
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A libavfilter source-only filter (Conways' Life Game).
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See the FFmpeg libavfilter documentation for details on the available
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filters.
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