[embedthumbnail] Add support for OGGVorbis, OGGOpus and FLAC using mutagen.

youtube_dl/postprocessor/embedthumbnail.py

@@ -3,6 +3,7 @@ from __future__ import unicode_literals
 
 
 import os
+import shutil
 import subprocess
 
 from .ffmpeg import FFmpegPostProcessor
@@ -41,6 +42,8 @@ class EmbedThumbnailPP(FFmpegPostProcessor):
                 'Skipping embedding the thumbnail because the file is missing.')
             return [], info
 
+        self._downloader.to_screen("used format" + info['ext'])
+
         if info['ext'] == 'mp3':
             options = [
                 '-c', 'copy', '-map', '0', '-map', '1',
@@ -87,7 +90,41 @@ class EmbedThumbnailPP(FFmpegPostProcessor):
             else:
                 os.remove(encodeFilename(filename))
                 os.rename(encodeFilename(temp_filename), encodeFilename(filename))
+        
+        elif info['ext'] in ['opus', 'ogg', 'flac']:
+            try:
+                from mutagen.oggvorbis import OggVorbis
+                from mutagen.oggopus   import OggOpus
+                from mutagen.flac      import Picture, FLAC
+                from base64            import b64encode
+
+                # to prevent the behaviour of in-place modification of Mutagen
+                shutil.copyfile(filename, temp_filename)
+
+                aufile = {'opus': OggOpus, 'flac': FLAC, 'ogg': OggVorbis} \
+                         [info['ext']](temp_filename)
+                
+                covart = Picture()
+                covart.data = open(thumbnail_filename, 'rb').read()
+                covart.type = 3 #< use as front cover.
+
+                if info['ext'] == 'flac':
+                    aufile.add_picture(covart)
+                else:
+                    # VorbisComments don't allow raw-bytes so it's encoded
+                    # in base64 and converted to a string.
+                    aufile['metadata_block_picture'] = \
+                        b64encode(covart.write()).decode('ascii')
+                
+                aufile.save()
+
+                if not self._already_have_thumbnail:
+                    os.remove(encodeFilename(thumbnail_filename))
+                os.remove(encodeFilename(filename))
+                os.rename(encodeFilename(temp_filename), encodeFilename(filename))
+            except ImportError:
+                raise EmbedThumbnailPPError('mutagen was not found. Please install.')
         else:
-            raise EmbedThumbnailPPError('Only mp3 and m4a/mp4 are supported for thumbnail embedding for now.')
+            raise EmbedThumbnailPPError('Only mp3, m4a/mp4, ogg, opus and flac are supported for thumbnail embedding for now.')
 
         return [], info