diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index 84d50dab76..0fbfe96423 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -1848,7 +1848,7 @@ class YoutubeDL(object):
             thumb_ext = determine_ext(t['url'], 'jpg')
             suffix = '_%s' % t['id'] if len(thumbnails) > 1 else ''
             thumb_display_id = '%s ' % t['id'] if len(thumbnails) > 1 else ''
-            thumb_filename = os.path.splitext(filename)[0] + suffix + '.' + thumb_ext
+            t['filename'] = thumb_filename = os.path.splitext(filename)[0] + suffix + '.' + thumb_ext
 
             if self.params.get('nooverwrites', False) and os.path.exists(encodeFilename(thumb_filename)):
                 self.to_screen('[%s] %s: Thumbnail %sis already present' %
diff --git a/youtube_dl/__init__.py b/youtube_dl/__init__.py
index 9cc9f851f4..ace17857c8 100644
--- a/youtube_dl/__init__.py
+++ b/youtube_dl/__init__.py
@@ -240,7 +240,13 @@ def _real_main(argv=None):
     if opts.xattrs:
         postprocessors.append({'key': 'XAttrMetadata'})
     if opts.embedthumbnail:
-        postprocessors.append({'key': 'EmbedThumbnail'})
+        already_have_thumbnail = opts.writethumbnail or opts.write_all_thumbnails
+        postprocessors.append({
+            'key': 'EmbedThumbnail',
+            'already_have_thumbnail': already_have_thumbnail
+        })
+        if not already_have_thumbnail:
+            opts.writethumbnail = True
     # Please keep ExecAfterDownload towards the bottom as it allows the user to modify the final file in any way.
     # So if the user is able to remove the file before your postprocessor runs it might cause a few problems.
     if opts.exec_cmd:
diff --git a/youtube_dl/postprocessor/embedthumbnail.py b/youtube_dl/postprocessor/embedthumbnail.py
index 4868a42fdc..8f825f7859 100644
--- a/youtube_dl/postprocessor/embedthumbnail.py
+++ b/youtube_dl/postprocessor/embedthumbnail.py
@@ -7,12 +7,9 @@ import subprocess
 
 from .ffmpeg import FFmpegPostProcessor
 
-from ..compat import (
-    compat_urlretrieve,
-)
 from ..utils import (
-    determine_ext,
     check_executable,
+    encodeArgument,
     encodeFilename,
     PostProcessingError,
     prepend_extension,
@@ -25,26 +22,30 @@ class EmbedThumbnailPPError(PostProcessingError):
 
 
 class EmbedThumbnailPP(FFmpegPostProcessor):
+    def __init__(self, downloader=None, already_have_thumbnail=False):
+        super(EmbedThumbnailPP, self).__init__(downloader)
+        self._already_have_thumbnail = already_have_thumbnail
+
     def run(self, info):
         filename = info['filepath']
         temp_filename = prepend_extension(filename, 'temp')
-        temp_thumbnail = filename + '.' + determine_ext(info['thumbnail'])
 
-        if not info.get('thumbnail'):
+        if not info.get('thumbnails'):
             raise EmbedThumbnailPPError('Thumbnail was not found. Nothing to do.')
 
-        compat_urlretrieve(info['thumbnail'], temp_thumbnail)
+        thumbnail_filename = info['thumbnails'][-1]['filename']
 
         if info['ext'] == 'mp3':
             options = [
-                '-i', temp_thumbnail, '-c', 'copy', '-map', '0', '-map', '1',
+                '-c', 'copy', '-map', '0', '-map', '1',
                 '-metadata:s:v', 'title="Album cover"', '-metadata:s:v', 'comment="Cover (Front)"']
 
             self._downloader.to_screen('[ffmpeg] Adding thumbnail to "%s"' % filename)
 
-            self.run_ffmpeg(filename, temp_filename, options)
+            self.run_ffmpeg_multiple_files([filename, thumbnail_filename], temp_filename, options)
 
-            os.remove(encodeFilename(temp_thumbnail))
+            if not self._already_have_thumbnail:
+                os.remove(encodeFilename(thumbnail_filename))
             os.remove(encodeFilename(filename))
             os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 
@@ -52,7 +53,12 @@ class EmbedThumbnailPP(FFmpegPostProcessor):
             if not check_executable('AtomicParsley', ['-v']):
                 raise EmbedThumbnailPPError('AtomicParsley was not found. Please install.')
 
-            cmd = ['AtomicParsley', filename, '--artwork', temp_thumbnail, '-o', temp_filename]
+            cmd = [encodeFilename('AtomicParsley', True),
+                   encodeFilename(filename, True),
+                   encodeArgument('--artwork'),
+                   encodeFilename(thumbnail_filename, True),
+                   encodeArgument('-o'),
+                   encodeFilename(temp_filename, True)]
 
             self._downloader.to_screen('[atomicparsley] Adding thumbnail to "%s"' % filename)
 
@@ -66,7 +72,8 @@ class EmbedThumbnailPP(FFmpegPostProcessor):
                 msg = stderr.decode('utf-8', 'replace').strip()
                 raise EmbedThumbnailPPError(msg)
 
-            os.remove(encodeFilename(temp_thumbnail))
+            if not self._already_have_thumbnail:
+                os.remove(encodeFilename(thumbnail_filename))
             # for formats that don't support thumbnails (like 3gp) AtomicParsley
             # won't create to the temporary file
             if b'No changes' in stdout: