Fix file-opened which returns an array

This fixes a crash when cutting after opening with ctrl+O

Also add more intelligent format detection.
Beause ffprobe only returns a list of formats

package.json

@@ -47,12 +47,14 @@
     "electron": "^1.4.5",
     "electron-default-menu": "^1.0.0",
     "execa": "^0.5.0",
+    "file-type": "^3.9.0",
     "jquery": "^3.1.1",
     "keyboardjs": "^2.3.3",
     "lodash": "^4.16.4",
     "react": "^15.3.2",
     "react-dom": "^15.3.2",
     "react-hammerjs": "^0.5.0",
+    "read-chunk": "^2.0.0",
     "which": "^1.2.11"
   }
 }

src/ffmpeg.js

@@ -2,8 +2,12 @@ const execa = require('execa');
 const bluebird = require('bluebird');
 const which = bluebird.promisify(require('which'));
 const path = require('path');
-const util = require('./util');
 const fs = require('fs');
+const fileType = require('file-type');
+const readChunk = require('read-chunk');
+const _ = require('lodash');
+
+const util = require('./util');
 
 bluebird.promisifyAll(fs);
 
@@ -56,7 +60,7 @@ function cut(filePath, format, cutFrom, cutTo) {
   });
 }
 
-function getFormats(filePath) {
+function getFormat(filePath) {
   return bluebird.try(() => {
     console.log('getFormat', filePath);
 
@@ -68,14 +72,21 @@ function getFormats(filePath) {
       .then((result) => {
         const formatsStr = JSON.parse(result.stdout).format.format_name;
         console.log('formats', formatsStr);
-        const formats = formatsStr.split(',');
+        const formats = (formatsStr || '').split(',');
-        return formats;
+
+        // ffprobe sometimes returns a list of formats, try to be a bit smarter about it.
+        return readChunk(filePath, 0, 262)
+          .then((bytes) => {
+            const ft = fileType(bytes);
+            if (_.includes(formats, ft.ext)) return ft.ext;
+            return formats[0] || undefined;
+          });
       });
   });
 }
 
 module.exports = {
   cut,
-  getFormats,
+  getFormat,
   showFfmpegFail,
 };

src/menu.js

@@ -19,8 +19,8 @@ module.exports = (app, mainWindow) => {
         label: 'Open',
         accelerator: 'CmdOrCtrl+O',
         click() {
-          dialog.showOpenDialog({ properties: ['openFile'] }, (data) => {
+          dialog.showOpenDialog({ properties: ['openFile'] }, (filePaths) => {
-            mainWindow.webContents.send('file-opened', data);
+            mainWindow.webContents.send('file-opened', filePaths);
           });
         },
       },

src/renderer.jsx

@@ -65,15 +65,17 @@ class App extends React.Component {
     };
 
     const load = (filePath) => {
+      console.log('Load', filePath);
       if (this.state.working) return alert('I\'m busy');
 
       resetState();
 
       this.setState({ working: true });
-      return ffmpeg.getFormats(filePath)
+
-        .then((formats) => {
+      return ffmpeg.getFormat(filePath)
-          if (formats.length < 1) return alert('Unsupported file');
+        .then((fileFormat) => {
-          return this.setState({ filePath, fileFormat: formats[0] });
+          if (!fileFormat) return alert('Unsupported file');
+          return this.setState({ filePath, fileFormat });
         })
         .catch((err) => {
           if (err.code === 1) {
@@ -85,9 +87,9 @@ class App extends React.Component {
         .finally(() => this.setState({ working: false }));
     };
 
-    electron.ipcRenderer.on('file-opened', (event, message) => {
+    electron.ipcRenderer.on('file-opened', (event, filePaths) => {
-      if (!message) return;
+      if (!filePaths || filePaths.length !== 1) return;
-      load(message);
+      load(filePaths[0]);
     });
 
     document.ondragover = document.ondragend = ev => ev.preventDefault();

test/formats.sh

@@ -1 +1 @@
-for f in sample-videos/*; do echo -n "$f:   "; ffprobe -show_format -of json -i "$f" | json format.format_name; done 2> /dev/null
+for f in *; do echo -n "$f:   "; ffprobe -show_format -of json -i "$f" | json format.format_name; done 2> /dev/null