/**
 * Add a filter
 * 
 * @param lutPath  Filter resource path
 * @param strength Filter strength (0-1)
 * @param startPts Start time (microseconds)
 * @param endPts   End time (microseconds)
 * @return Unique filter ID
 */
int filterId = editor.addFilter(lutPath, strength, startPts, endPts);

/**
 * Adjust filter strength
 * 
 * @param filterId Filter ID
 * @param strength Filter strength (0-1)
 */
editor.setFilterStrength(filterId, strength);

/**
 * Remove filter
 * 
 * @param filterId Filter ID
 */
editor.removeFilter(filterId);

// Add filter (strength 0.8, from 1s to 5s)
int filterId = editor.addFilter("/sdcard/filter.lut", 0.8f, 1_000_000, 5_000_000);

// Adjust filter strength to 0.5
editor.setFilterStrength(filterId, 0.5f);

// Remove filter
editor.removeFilter(filterId);