Flutter - FFmpeg Kit exit code 1 when creating video

Question

I'm trying to make a video out of two things:

1. image
2. audio file

I want to combine these two things and make a video of it.

Here is my code:

import 'dart:io';
import 'package:ffmpeg_kit_flutter/ffmpeg_kit.dart';
import 'package:ffmpeg_kit_flutter/return_code.dart';
import 'package:flutter_image_compress/flutter_image_compress.dart';
import 'package:image_picker/image_picker.dart';
import 'package:file_picker/file_picker.dart';
import 'package:path_provider/path_provider.dart';

Future<void> createVideoFromUserSelection() async {
  final ImagePicker _picker = ImagePicker();
  final FilePickerResult? audioResult = await FilePicker.platform.pickFiles(
    type: FileType.audio,
    allowMultiple: false,
  );
  final FilePickerResult? imageResult = await FilePicker.platform.pickFiles(
    type: FileType.image,
    allowMultiple: false,
  );

  if (audioResult != null && imageResult != null) {
    final File audioFile = File(audioResult.files.single.path!);
    final File imageFile = File(imageResult.files.single.path!);

    final compressedImageBytes = await FlutterImageCompress.compressWithFile(
      imageFile.path,
      quality: 70, // Adjust the image quality as needed
    );

    final compressedImageFile =
        File('${(await getTemporaryDirectory()).path}/temp_image.jpg');
    await compressedImageFile.writeAsBytes(compressedImageBytes!.toList());

    final outputDirectory = Directory(
        '/storage/emulated/0/Download'); // Specify the desired output directory
    final outputFileName =
        'output_video.mp4'; // Specify the desired output file name
    final outputFile = File('${outputDirectory.path}/$outputFileName');

    if (audioResult != null && imageResult != null) {
      final File audioFile = File(audioResult.files.single.path!);
      final File imageFile = File(imageResult.files.single.path!);

      // Verify audio file existence
      if (!await audioFile.exists()) {
        print("Audio file does not exist at path: ${audioFile.path}");
        return;
      }

      // Verify image file existence
      if (!await imageFile.exists()) {
        print("Image file does not exist at path: ${imageFile.path}");
        return;
      }
    }

    final arguments = [
      '-loop',
      '1',
      '-i',
      compressedImageFile.path,
      '-i',
      audioFile.path,
      '-c:v',
      'libx264',
      '-c:a',
      'aac',
      outputFile.path,
    ];

    await FFmpegKit.executeWithArguments(arguments).then((session) async {
      final output = await session.getLastReceivedStatistics();
      print("FFmpeg session output:\n$output");

      final returnCode = await session.getReturnCode();
      print("Return code: $returnCode");

      if (returnCode == ReturnCode.success) {
        print("Video creation completed");
      } else {
        print("Video creation failed. FFmpeg exit code: $returnCode");
      }
    }, onError: (error) {
      print("Video creation failed. Error: $error");
    });

    // Delete the temporary compressed image and audio files
    compressedImageFile.delete();
    audioFile.delete();
  } else {
    print("User canceled the selection.");
  }
}

Each time I run this function inside my UI, it allows the user to pick image, audio as well but I get exit code 1 each time. Has anybody any solution to this problem?

I have added storage permission in AndroidManifest.xml:

<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" /> 

Thank you