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-rw-r--r--youtube_dl/postprocessor/ffmpeg.py6
1 files changed, 5 insertions, 1 deletions
diff --git a/youtube_dl/postprocessor/ffmpeg.py b/youtube_dl/postprocessor/ffmpeg.py
index 75ee87e1a..d5b71b96f 100644
--- a/youtube_dl/postprocessor/ffmpeg.py
+++ b/youtube_dl/postprocessor/ffmpeg.py
@@ -464,7 +464,11 @@ class FFmpegMetadataPP(FFmpegPostProcessor):
filename = info['filepath']
temp_filename = prepend_extension(filename, 'temp')
- options = ['-c', 'copy']
+ if info['ext'] == u'm4a':
+ options = ['-vn', '-acodec', 'copy']
+ else:
+ options = ['-c', 'copy']
+
for (name, value) in metadata.items():
options.extend(['-metadata', '%s=%s' % (name, value)])