Merge pull request #392 from whyboris/duration-undefined-fix

fix cannot read property duration of undefined

Author: whyboris

main-support.ts

@@ -441,15 +441,13 @@ function getBestStream(metadata) {
  * Return the duration from file by parsing metadata
  * @param metadata
  */
-function getFileDuration(metadata) {
-  try {
+function getFileDuration(metadata): number {
+  if (metadata && metadata.streams && metadata.streams[0] && metadata.streams[0].duration ) {
     return metadata.streams[0].duration;
-  } catch (e1) {
-    try {
-      return metadata.format.duration;
-    } catch (e2) {
-      return 0;
-    }
+  } else if (metadata && metadata.format && metadata.format.duration ) {
+    return metadata.format.duration;
+  } else {
+    return 0;
   }
 }
 
@@ -474,7 +472,7 @@ function extractMetadataForThisONEFile(
     } else {
       const metadata = JSON.parse(data);
       const stream = getBestStream(metadata);
-      const fileDuration = getFileDuration(metadata);
+      const fileDuration: number = getFileDuration(metadata);
 
       const duration = Math.round(fileDuration) || 0;
       const origWidth = stream.width || 0; // ffprobe does not detect it on some MKV streams