From 743f39750cccf53bc320e057a6ed05e301e8ed48 Mon Sep 17 00:00:00 2001
From: pukkandan <pukkandan.ytdlp@gmail.com>
Date: Tue, 12 Apr 2022 19:57:08 +0530
Subject: [PATCH] Fix bug in 66cf3e1001b6d9a2829fe834c3f9103b0890918e

---
 yt_dlp/postprocessor/ffmpeg.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/yt_dlp/postprocessor/ffmpeg.py b/yt_dlp/postprocessor/ffmpeg.py
index 4b61693a2..6fe1b6cdd 100644
--- a/yt_dlp/postprocessor/ffmpeg.py
+++ b/yt_dlp/postprocessor/ffmpeg.py
@@ -187,8 +187,7 @@ class FFmpegPostProcessor(PostProcessor):
         yield from ('-dn', '-ignore_unknown')
         if copy:
             yield from ('-c', 'copy')
-        # For some reason, '-c copy -map 0' is not enough to copy subtitles
-        if ext in ('mp4', 'mov'):
+        if ext in ('mp4', 'mov', 'm4a'):
             yield from ('-c:s', 'mov_text')
 
     def get_audio_codec(self, path):