diff --git a/youtube_dlc/postprocessor/embedthumbnail.py b/youtube_dlc/postprocessor/embedthumbnail.py
index 94e3eca981..50678669f5 100644
--- a/youtube_dlc/postprocessor/embedthumbnail.py
+++ b/youtube_dlc/postprocessor/embedthumbnail.py
@@ -96,7 +96,7 @@ def is_webp(path):
             os.rename(encodeFilename(old_thumbnail_filename), encodeFilename(thumbnail_filename))
 
             options = [
-                '-c', 'copy', '-map', '0',
+                '-c', 'copy', '-map', '0', '-dn',
                 '-attach', thumbnail_filename, '-metadata:s:t', 'mimetype=image/jpeg']
 
             self._downloader.to_screen('[ffmpeg] Adding thumbnail to "%s"' % filename)
diff --git a/youtube_dlc/postprocessor/ffmpeg.py b/youtube_dlc/postprocessor/ffmpeg.py
index c7071d73db..35939dbb05 100644
--- a/youtube_dlc/postprocessor/ffmpeg.py
+++ b/youtube_dlc/postprocessor/ffmpeg.py
@@ -359,7 +359,7 @@ def run(self, information):
         if information['ext'] == self._preferedformat:
             self._downloader.to_screen('[ffmpeg] Not remuxing video file %s - already is in target format %s' % (path, self._preferedformat))
             return [], information
-        options = ['-c', 'copy', '-map', '0']
+        options = ['-c', 'copy', '-map', '0', '-dn']
         prefix, sep, ext = path.rpartition('.')
         outpath = prefix + sep + self._preferedformat
         self._downloader.to_screen('[' + 'ffmpeg' + '] Remuxing video from %s to %s, Destination: ' % (information['ext'], self._preferedformat) + outpath)
@@ -428,7 +428,7 @@ def run(self, information):
         input_files = [filename] + sub_filenames
 
         opts = [
-            '-c', 'copy', '-map', '0',
+            '-c', 'copy', '-map', '0', '-dn',
             # Don't copy the existing subtitles, we may be running the
             # postprocessor a second time
             '-map', '-0:s',
@@ -498,7 +498,7 @@ def add(meta_list, info_list=None):
         filename = info['filepath']
         temp_filename = prepend_extension(filename, 'temp')
         in_filenames = [filename]
-        options = ['-map', '0']
+        options = ['-map', '0', '-dn']
 
         if info['ext'] == 'm4a':
             options.extend(['-vn', '-acodec', 'copy'])
@@ -578,7 +578,7 @@ def run(self, info):
         filename = info['filepath']
         temp_filename = prepend_extension(filename, 'temp')
 
-        options = ['-c', 'copy', '-map', '0', '-aspect', '%f' % stretched_ratio]
+        options = ['-c', 'copy', '-map', '0', '-dn', '-aspect', '%f' % stretched_ratio]
         self._downloader.to_screen('[ffmpeg] Fixing aspect ratio in "%s"' % filename)
         self.run_ffmpeg(filename, temp_filename, options)
 
@@ -596,7 +596,7 @@ def run(self, info):
         filename = info['filepath']
         temp_filename = prepend_extension(filename, 'temp')
 
-        options = ['-c', 'copy', '-map', '0', '-f', 'mp4']
+        options = ['-c', 'copy', '-map', '0', '-dn', '-f', 'mp4']
         self._downloader.to_screen('[ffmpeg] Correcting container in "%s"' % filename)
         self.run_ffmpeg(filename, temp_filename, options)
 
@@ -612,7 +612,7 @@ def run(self, info):
         if self.get_audio_codec(filename) == 'aac':
             temp_filename = prepend_extension(filename, 'temp')
 
-            options = ['-c', 'copy', '-map', '0', '-f', 'mp4', '-bsf:a', 'aac_adtstoasc']
+            options = ['-c', 'copy', '-map', '0', '-dn', '-f', 'mp4', '-bsf:a', 'aac_adtstoasc']
             self._downloader.to_screen('[ffmpeg] Fixing malformed AAC bitstream in "%s"' % filename)
             self.run_ffmpeg(filename, temp_filename, options)