Bug fixes

Fix null error if unknown filetype.
Handle ENOENT:
Windows will throw error with code ENOENT if format detection fails.

src/ffmpeg.js

@@ -78,7 +78,7 @@ function getFormat(filePath) {
         return readChunk(filePath, 0, 262)
           .then((bytes) => {
             const ft = fileType(bytes);
-            if (_.includes(formats, ft.ext)) return ft.ext;
+            if (_.includes(formats, (ft || {}).ext)) return ft.ext;
             return formats[0] || undefined;
           });
       });

src/renderer.jsx

@@ -78,7 +78,7 @@ class App extends React.Component {
           return this.setState({ filePath, fileFormat });
         })
         .catch((err) => {
-          if (err.code === 1) {
+          if (err.code === 1 || err.code === 'ENOENT') {
             alert('Unsupported file');
             return;
           }