From 4f04be6add6133d103b4c671cec02128a8a0f16e Mon Sep 17 00:00:00 2001
From: pukkandan <pukkandan.ytdlp@gmail.com>
Date: Sun, 31 Jul 2022 01:35:56 +0530
Subject: Validate `--merge-output-format`

Closes #4489
---
 yt_dlp/postprocessor/ffmpeg.py | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'yt_dlp/postprocessor/ffmpeg.py')

diff --git a/yt_dlp/postprocessor/ffmpeg.py b/yt_dlp/postprocessor/ffmpeg.py
index c4dc99fe8..f80838962 100644
--- a/yt_dlp/postprocessor/ffmpeg.py
+++ b/yt_dlp/postprocessor/ffmpeg.py
@@ -801,6 +801,8 @@ class FFmpegMetadataPP(FFmpegPostProcessor):
 
 
 class FFmpegMergerPP(FFmpegPostProcessor):
+    SUPPORTED_EXTS = MEDIA_EXTENSIONS.common_video
+
     @PostProcessor._restrict_to(images=False)
     def run(self, info):
         filename = info['filepath']
-- 
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