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void vf_seek_reset(struct vf_chain *c);
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struct vf_instance *vf_append_filter(struct vf_chain *c, const char *name,
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int vf_append_filter_list(struct vf_chain *c, struct m_obj_settings *list);
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struct vf_instance *vf_find_by_label(struct vf_chain *c, const char *label);
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void vf_print_filter_chain(struct vf_chain *c, int msglevel);