added the newline back which i removed by mistake

Co-authored-by: Simon Sawicki <accounts@grub4k.xyz>

yt_dlp/postprocessor/embedthumbnail.py

@@ -100,12 +100,12 @@ class EmbedThumbnailPP(FFmpegPostProcessor):
                         del audio['APIC']
                     with open(thumbnail_filename, 'rb') as thumbfile:
                         audio['APIC'] = mutagen.id3.APIC(
-                            encoding=3, mime='image/%s' % thumbnail_ext, type=3,
+                            encoding=mutagen.id3.Encoding.UTF8, mime='image/%s' % thumbnail_ext, type=3,
                             desc=u'Cover (front)', data=thumbfile.read())
                     audio.save()
                     temp_filename = filename  # Mutagen saves to the original file
                 except Exception as err:
-                    self.report_warning('unable to embed using mutagen; %s' % error_to_compat_str(err))
+                    self.report_warning(f'unable to embed using mutagen; {err}')
                     success = False
             # Method 2: Use ffmpeg
             else:

yt_dlp/postprocessor/ffmpeg.py

@@ -639,6 +639,7 @@ class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
             if not mp4_ass_warn and ext == 'mp4' and sub_ext == 'ass':
                 mp4_ass_warn = True
                 self.report_warning('ASS subtitles cannot be properly embedded in mp4 files; expect issues')
+
         if not sub_langs:
             return [], info
 
@@ -672,14 +673,16 @@ class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
     def embed_lyrics(self, input_files):
         audio_file = input_files[0]
         subs = input_files[1]
+        if len(input_files) > 2:
+            self.report_warning('More than one subtitle file found. Only one will be embedded')
         if not subs.endswith('.lrc'):
             raise PostProcessingError('LRC subtitles required. Use "--convert-subs lrc" to convert')
-        else:
+
         with open(subs, 'r', encoding='utf-8') as f:
             lyrics = f.read().strip()
         if audio_file.endswith('.mp3'):
             audio = mutagen.id3.ID3(audio_file)
-                audio.add(mutagen.id3.USLT(encoding=3, lang='eng', desc='', text=lyrics))
+            audio.add(mutagen.id3.USLT(encoding=mutagen.id3.Encoding.UTF8, lang='und', desc='', text=lyrics))
             audio.save()
         else:
             metadata = mutagen.File(audio_file)