diff --git a/app/YtManagerApp/management/jobs/download_video.py b/app/YtManagerApp/management/jobs/download_video.py
index d507c09..1d8b838 100644
--- a/app/YtManagerApp/management/jobs/download_video.py
+++ b/app/YtManagerApp/management/jobs/download_video.py
@@ -82,6 +82,7 @@ class DownloadVideoJob(Job):
             'writesubtitles': user.preferences['download_subtitles'],
             'writeautomaticsub': user.preferences['download_autogenerated_subtitles'],
             'allsubtitles': user.preferences['download_subtitles_all'],
+            'merge_output_format': 'mp4',
             'postprocessors': [
                 {
                     'key': 'FFmpegMetadata'