[ffmpeg] global ffmpeg

lib/services/converter.dart

@@ -10,7 +10,6 @@ import 'package:path/path.dart' as p;
 
 class ConverterService {
   late Directory tempDir;
-  late String assetName;
   late String ffmpegPath;
 
   ConverterService._();
@@ -24,23 +23,26 @@ class ConverterService {
 
   Future<void> _init() async {
     tempDir = await getTemporaryDirectory();
-    assetName = 'ffmpeg.exe';
-    await copyExecutable();
+    if (Platform.isWindows) {
+      ffmpegPath = 'ffmpeg.exe';
+    } else if (Platform.isLinux) {
+      ffmpegPath = 'ffmpeg';
+    } else if (Platform.isMacOS) {
+      ffmpegPath = 'ffmpeg';
+    }
+    await checkFFmpeg();
   }
 
-  Future<void> copyExecutable() async {
-    File tempFile = File('${tempDir.path}/$assetName');
-
-    ByteData data = await rootBundle.load('assets/executable/$assetName');
-    await tempFile.exists().then((value) {
-      if (!value) {
-        debugPrint('Copying $assetName to ${tempFile.path}');
-        tempFile.writeAsBytes(
-            data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes));
+  Future<void> checkFFmpeg() async {
+    try {
+      var result = await Process.run(ffmpegPath, ['-version']);
+      if (result.exitCode == 0) {
+        print('FFmpeg is installed.');
+        return;
       }
-    });
-
-    ffmpegPath = tempFile.path;
+    } catch (e) {
+      print('FFmpeg is not installed.');
+    }
   }
 
   Future<File?> getTmpFile(String filename) async {