Add metadata extraction example

dev/convert.html

@@ -66,6 +66,7 @@
 			},
 			*/
 			video: {
+				width: 640
 				//forceReencode: true,
 				//rotate: 90
 				//width: 720 ?? 2160,
@@ -77,10 +78,10 @@
 				//width: 200,
 				//height: 100,
 			},
-			//trim: {
-			//	start: 0,
-			//	end: 30
-			//},
+			trim: {
+				start: 0,
+				end: 40
+			},
 			computeProgress: true
 		});
 		console.log(conversion);