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245 lines
6.8 KiB
245 lines
6.8 KiB
/**
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* /brief Crop Detection filter
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*
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* /author Zachary Drew, Copyright 2005
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*
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* inspired by mplayer's cropdetect filter
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*
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* Note: The goemetry generated is zero-indexed and is inclusive of the end values
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*
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* Options:
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* -filter crop_detect debug=1 // Visualize crop
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* -filter crop_detect frequency=25 // Detect the crop once a second
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* -filter crop_detect frequency=0 // Never detect unless the producer changes
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* -filter crop_detect thresh=100 // Changes the threshold (default = 25)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#define DEBUG
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#define DEFAULT_THRESH 20
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#include <framework/mlt.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <string.h>
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#include "arrow_code.h"
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#define ABS(a) ((a) >= 0 ? (a) : (-(a)))
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// Image stack(able) method
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static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
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{
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// Get the filter object and properties
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mlt_filter filter = mlt_frame_pop_service( this );
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mlt_properties properties = MLT_FILTER_PROPERTIES( filter );
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// Get the new image
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int error = mlt_frame_get_image( this, image, format, width, height, 1 );
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if( error != 0 ) {
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mlt_properties_debug( MLT_FRAME_PROPERTIES(this), "error after mlt_frame_get_image()", stderr );
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return error;
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}
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// Parameter that describes how often to check for the crop
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int frequency = mlt_properties_get_int( properties, "frequency");
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// Producers may start with blank footage, by default we will skip, oh, 5 frames unless overridden
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int skip = mlt_properties_get_int( properties, "skip");
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// The result
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mlt_geometry_item bounds = mlt_properties_get_data( properties, "bounds", NULL );
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// Initialize if needed
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if( bounds == NULL ) {
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bounds = calloc( 1, sizeof( struct mlt_geometry_item_s ) );
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bounds->w = *width;
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bounds->h = *height;
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mlt_properties_set_data( properties, "bounds", bounds, sizeof( struct mlt_geometry_item_s ), free, NULL );
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}
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// For periodic detection (with offset of 'skip')
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if( frequency == 0 || (int)(mlt_frame_get_position(this)+skip) % frequency != 0)
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{
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// Inject in stream
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mlt_properties_set_data( MLT_FRAME_PROPERTIES(this), "bounds", bounds, sizeof( struct mlt_geometry_item_s ), NULL, NULL );
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return 0;
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}
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// There is no way to detect a crop for sure, so make up an arbitrary one
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int thresh = mlt_properties_get_int( properties, "thresh" );
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int xstride, ystride;
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switch( *format ) {
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case mlt_image_yuv422:
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xstride = 2;
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ystride = 2 * *width;
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break;
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default:
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fprintf(stderr, "image format not supported by filter_crop_detect\n");
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return -1;
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}
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int x, y, average_brightness, deviation; // Scratch variables
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uint8_t *q;
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// Top crop
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for( y = 0; y < *height/2; y++ ) {
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bounds->y = y;
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average_brightness = 0;
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deviation = 0;
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q = *image + y*ystride;
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for( x = 0; x < *width; x++ )
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average_brightness += q[x*xstride];
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average_brightness /= *width;
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for( x = 0; x < *width; x++ )
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deviation += abs(average_brightness - q[x*xstride]);
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if( deviation*10 >= thresh * *width )
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break;
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}
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// Bottom crop
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for( y = *height - 1; y >= *height/2; y-- ) {
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bounds->h = y;
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average_brightness = 0;
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deviation = 0;
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q = *image + y*ystride;
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for( x = 0; x < *width; x++ )
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average_brightness += q[x*xstride];
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average_brightness /= *width;
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for( x = 0; x < *width; x++ )
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deviation += abs(average_brightness - q[x*xstride]);
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if( deviation*10 >= thresh * *width)
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break;
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}
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// Left crop
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for( x = 0; x < *width/2; x++ ) {
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bounds->x = x;
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average_brightness = 0;
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deviation = 0;
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q = *image + x*xstride;
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for( y = 0; y < *height; y++ )
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average_brightness += q[y*ystride];
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average_brightness /= *height;
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for( y = 0; y < *height; y++ )
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deviation += abs(average_brightness - q[y*ystride]);
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if( deviation*10 >= thresh * *width )
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break;
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}
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// Right crop
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for( x = *width - 1; x >= *width/2; x-- ) {
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bounds->w = x;
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average_brightness = 0;
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deviation = 0;
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q = *image + x*xstride;
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for( y = 0; y < *height; y++ )
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average_brightness += q[y*ystride];
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average_brightness /= *height;
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for( y = 0; y < *height; y++ )
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deviation += abs(average_brightness - q[y*ystride]);
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if( deviation*10 >= thresh * *width )
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break;
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}
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/* Debug: Draw arrows to show crop */
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if( mlt_properties_get_int( properties, "debug") == 1 )
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{
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init_arrows( format, *width, *height );
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draw_arrow(*image, bounds->x, *height/2, bounds->x+50, *height/2, 100);
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draw_arrow(*image, *width/2, bounds->y, *width/2, bounds->y+50, 100);
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draw_arrow(*image, bounds->w, *height/2, bounds->w-50, *height/2, 100);
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draw_arrow(*image, *width/2, bounds->h, *width/2, bounds->h-50, 100);
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draw_arrow(*image, bounds->x, bounds->y, bounds->x+40, bounds->y+30, 100);
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draw_arrow(*image, bounds->x, bounds->h, bounds->x+40, bounds->h-30, 100);
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draw_arrow(*image, bounds->w, bounds->y, bounds->w-40, bounds->y+30, 100);
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draw_arrow(*image, bounds->w, bounds->h, bounds->w-40, bounds->h-30, 100);
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}
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// Convert to width and correct indexing
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bounds->w -= bounds->x - 1;
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bounds->h -= bounds->y - 1;
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if( mlt_properties_get_int( properties, "debug") == 1 )
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fprintf(stderr, "Top:%f Left:%f Width:%f Height:%f\n", bounds->y, bounds->x, bounds->w, bounds->h);
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/* inject into frame */
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mlt_properties_set_data( MLT_FRAME_PROPERTIES(this), "bounds", bounds, sizeof( struct mlt_geometry_item_s ), NULL, NULL );
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return error;
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}
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/** Filter processing.
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*/
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static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
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{
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// Put the filter object somewhere we can find it
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mlt_frame_push_service( frame, this);
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// Push the frame filter
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mlt_frame_push_get_image( frame, filter_get_image );
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return frame;
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}
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/** Constructor for the filter.
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*/
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mlt_filter filter_crop_detect_init( char *arg )
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{
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mlt_filter this = mlt_filter_new( );
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if ( this != NULL )
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{
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this->process = filter_process;
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/* defaults */
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mlt_properties_set_int( MLT_FILTER_PROPERTIES(this), "frequency", 1);
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mlt_properties_set_int( MLT_FILTER_PROPERTIES(this), "thresh", 5);
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mlt_properties_set_int( MLT_FILTER_PROPERTIES(this), "clip", 5);
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mlt_properties_set_int( MLT_FILTER_PROPERTIES(this), "former_producer_id", -1);
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}
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return this;
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}
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/** This source code will self destruct in 5...4...3...
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*/
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