Refactored the according according to 'flake8'

youtube_dl/postprocessor/embedthumbnail.py

@@ -3,24 +3,19 @@ from __future__ import unicode_literals
 
 
 import os
-import subprocess
 
 try:
     import imghdr
-    from mutagen.id3 import PictureType, ID3, APIC
-    from mutagen.mp4 import MP4, MP4Cover
+    from mutagen.id3 import PictureType, ID3, APIC, ID3NoHeaderError
+    from mutagen.mp4 import MP4, MP4Cover, MP4MetadataError
 except ImportError:
     raise Exception('[embedthumbnail] Mutagen isn\'t found as a dependency to embed thumbnails!')
 
 from .ffmpeg import FFmpegPostProcessor
 
 from ..utils import (
-    check_executable,
-    encodeArgument,
     encodeFilename,
-    PostProcessingError,
-    prepend_extension,
-    shell_quote
+    PostProcessingError
 )
 
 
@@ -50,14 +45,9 @@ class EmbedThumbnailPP(FFmpegPostProcessor):
         if info['ext'] == 'mp3':
             try:
                 meta = ID3(filename)
-            except:
+            except ID3NoHeaderError:
                 raise EmbedThumbnailPPError("MP3 file doesn't have a existing ID3v2 tag.")
 
-            # Update older tags (eg. ID3v1) to a newer version,
-            # which supports embedded-thumbnails (e.g ID3v2.3).
-            # NOTE: ID3v2.4 might not be supported by programs.
-            meta.update_to_v23()
-            
             # Appends a Cover-front thumbnail, it's the most common
             # type of thumbnail distributed with.
             meta.add(APIC(
@@ -74,15 +64,15 @@ class EmbedThumbnailPP(FFmpegPostProcessor):
         elif info['ext'] in ['m4a', 'mp4']:
             try:
                 meta = MP4(filename)
-            except:
+            except MP4MetadataError:
                 raise EmbedThumbnailPPError("MPEG-4 file's atomic structure for embedding isn't correct!")
 
             # NOTE: the 'covr' atom is a non-standard MPEG-4 atom,
             # Apple iTunes 'M4A' files include the 'moov.udta.meta.ilst' atom.
             meta.tags['covr'] = [MP4Cover(
                 data=open(thumbnail_filename, 'rb').read(),
-                imageformat= MP4Cover.FORMAT_JPEG if \
-                            imghdr.what(thumbnail_filename) == 'jpeg' \
+                imageformat=MP4Cover.FORMAT_JPEG if
+                imghdr.what(thumbnail_filename) == 'jpeg'
                 else MP4Cover.FORMAT_PNG)]
 
             meta.save()