// Excerpt from php/setMediaEncoder.php (3,402 lines) in the WebsiteBuilder
// source: the create_gif encode operation, lines 614-665, reproduced verbatim.
	if($output_options->encode_media=="create_gif") {
	    $output_gif= ".." . $settings->directory . $output_file .$output_options->format .".gif";

		$docmime= checkFinfo($input_file);
			$doctype=explode("/",$docmime)[0];
		if ($doctype!="video"){
				$output_options->error_message= "We only create gifs from a video - it must be the first video in the media list.";
				$returnFiles = returnFiles ( $output_options, $output_file .$output_options->format . '.mp4', "video/mp4",  '', null );
				return $returnFiles;
			}
		
				$cmd  = "ffmpeg  -i ".$input_file." -y -vf fps=".$settings->settings->movie_frame_rate.",scale=".$settings->settings->video_width.":".$settings->settings->video_height.",palettegen palette.png 2>&1";
// 				$cmd  = "ffmpeg  -i ".$input_file." -y -vf fps=10,scale=".$settings->settings->video_width.":".$settings->settings->video_height.",palettegen palette.png 2>&1";
				$result=shell_exec($cmd);
				$first_media=json_decode($settings->add_media)[0];
					
// 				$cmd  = "ffmpeg -ss ".$first_media->add_media_start." -t ".$first_media->add_media_duration." -i ".$input_file." -i palette.png -y -filter_complex  \"fps=10[x];[x][1:v]paletteuse\" ".$output_gif." ";
				$cmd  = "ffmpeg -ss ".$first_media->add_media_start." -t ".$first_media->add_media_duration." -i ".$input_file." -i palette.png -y -filter_complex  \"fps=".$settings->settings->movie_frame_rate.",scale=".$settings->settings->video_width.":".$settings->settings->video_height.":flags=lanczos[x];[x][1:v]paletteuse\" ".$output_gif." ";
				ffmpegMsg("ffmpeg","Creating Gif   ", 0,$cmd);
				
// 				$cmd_2='mogrify  -delay '.$_POST['compress_gif_delay'].' -alpha remove  '.$matte.' -depth '.$_POST['compress_gif_depth'].' '.$deconstruct.'  '.$dither.' -colors '.$_POST['compress_gif_colors'].' -fuzz '.$_POST['compress_gif_fuzz'].'%  '.$loop.' '.$optimize.' '.$path.'  2>&1';
				
				$_POST['loop_gif']="true";
				$_POST['compress_gif_matte']="false";
				$_POST['compress_gif_deconstruct']="false";
				$_POST['compress_gif_dither']="true";
				$_POST['compress_gif_optimize']="true";
				
				$loop=($_POST['loop_gif']=="false")?"-loop 1":"";
				$matte=($_POST['compress_gif_matte']=="true")?"-matte":"";
				$deconstruct=($_POST['compress_gif_deconstruct']=="true")?"-deconstruct":"";
				$dither=($_POST['compress_gif_dither']=="true")?"-dither none ":"";
				$optimize=($_POST['compress_gif_optimize']=="true")?"-layers optimize ":"";
// 				$optimize=($_POST['compress_gif_optimize']=="true")?" -coalesce -layers RemoveDups ":"";
				
				$_POST['compress_gif_depth']=16;
				$_POST['compress_gif_delay']=0;
				$_POST['compress_gif_fuzz']="4";
				$_POST['compress_gif_colors']="16";
				
				$cmd_2='mogrify  -delay '.$_POST['compress_gif_delay'].' -alpha remove  '.$matte.' -depth '.$_POST['compress_gif_depth'].' '.$deconstruct.'  '.$dither.' -colors '.$_POST['compress_gif_colors'].' -fuzz '.$_POST['compress_gif_fuzz'].'%  '.$loop.' '.$optimize.' '.$output_gif.'  2>&1';
				$result=shell_exec($cmd_2);
				
				
				$output_options->edited_url= $output_options->options->directory.$output_file .$output_options->format . '.gif';
				$output_options->edited_name= $output_file .$output_options->format . '.gif';
				$output_options->edited_type = "image/gif";
				$output_options->edited_filetype = explode ( "/", "image/gif");
				insert_document($output_options->edited_url,"image/gif",$output_options->edited_name,"image","edited");
			 $returnFiles = returnFiles ( $output_options, $output_file .$output_options->format . '.mp4', "video/mp4",  '', null );
			return $returnFiles;
	}