How to merge one image and one audio file to make one video file in Flutter
I attached my code but not working

final Directory tempDir = await getTemporaryDirectory();
    final String outputPath =
        path.join(tempDir.path, '${DateTime.now().second}output.mp4');

    print("Check Image Path ==> ${imagePathSelected}");
    print("Check Image Path ==> ${audioPathSelected}");
    // Paths to your image and audio files
    String imagePath = imagePathSelected!; // Update with actual path
    String audioPath = audioPathSelected!; // Update with actual path

    await mergeImageAndAudio(imagePath, audioPath, outputPath);


Future<void> mergeImageAndAudio(
      String imagePath, String audioPath, String outputPath) async {
    // Define the FFmpeg command
    String command =
        "-y -i $imagePath -i $audioPath -map 0:v -map 1:a -c:v copy "
        "-shortest $outputPath";
    // Execute the command
    int rc = await _flutterFFmpeg.execute(command);
    if (rc == 0) {
      print("FFmpeg process completed successfully.");
    } else {
      print("FFmpeg process failed with return code $rc.");
    }
  }