Postprocessors: use a list for the files that can be deleted

We could only know if we had to delete the original file, but this system allows to specify us more files (like subtitles).

youtube_dl/postprocessor/ffmpeg.py

@@ -267,7 +267,7 @@ def run(self, information):
         if (new_path == path or
                 (self._nopostoverwrites and os.path.exists(encodeFilename(new_path)))):
             self._downloader.to_screen('[youtube] Post-process file %s exists, skipping' % new_path)
-            return True, information
+            return [], information
 
         try:
             self._downloader.to_screen('[' + self.basename + '] Destination: ' + new_path)
@@ -285,7 +285,7 @@ def run(self, information):
                 errnote='Cannot update utime of audio file')
 
         information['filepath'] = new_path
-        return False, information
+        return [path], information
 
 
 class FFmpegVideoConvertorPP(FFmpegPostProcessor):
@@ -299,13 +299,13 @@ def run(self, information):
         outpath = prefix + sep + self._preferedformat
         if information['ext'] == self._preferedformat:
             self._downloader.to_screen('[ffmpeg] Not converting video file %s - already is in target format %s' % (path, self._preferedformat))
-            return True, information
+            return [], information
         self._downloader.to_screen('[' + 'ffmpeg' + '] Converting video from %s to %s, Destination: ' % (information['ext'], self._preferedformat) + outpath)
         self.run_ffmpeg(path, outpath, [])
         information['filepath'] = outpath
         information['format'] = self._preferedformat
         information['ext'] = self._preferedformat
-        return False, information
+        return [path], information
 
 
 class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
@@ -505,11 +505,11 @@ def _conver_lang_code(cls, code):
     def run(self, information):
         if information['ext'] != 'mp4':
             self._downloader.to_screen('[ffmpeg] Subtitles can only be embedded in mp4 files')
-            return True, information
+            return [], information
         subtitles = information.get('requested_subtitles')
         if not subtitles:
             self._downloader.to_screen('[ffmpeg] There aren\'t any subtitles to embed')
-            return True, information
+            return [], information
 
         sub_langs = list(subtitles.keys())
         filename = information['filepath']
@@ -535,7 +535,7 @@ def run(self, information):
         os.remove(encodeFilename(filename))
         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 
-        return True, information
+        return [], information
 
 
 class FFmpegMetadataPP(FFmpegPostProcessor):
@@ -561,7 +561,7 @@ def run(self, info):
 
         if not metadata:
             self._downloader.to_screen('[ffmpeg] There isn\'t any metadata to add')
-            return True, info
+            return [], info
 
         filename = info['filepath']
         temp_filename = prepend_extension(filename, 'temp')
@@ -578,7 +578,7 @@ def run(self, info):
         self.run_ffmpeg(filename, temp_filename, options)
         os.remove(encodeFilename(filename))
         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
-        return True, info
+        return [], info
 
 
 class FFmpegMergerPP(FFmpegPostProcessor):
@@ -587,7 +587,7 @@ def run(self, info):
         args = ['-c', 'copy', '-map', '0:v:0', '-map', '1:a:0']
         self._downloader.to_screen('[ffmpeg] Merging formats into "%s"' % filename)
         self.run_ffmpeg_multiple_files(info['__files_to_merge'], filename, args)
-        return True, info
+        return [], info
 
 
 class FFmpegAudioFixPP(FFmpegPostProcessor):
@@ -602,14 +602,14 @@ def run(self, info):
         os.remove(encodeFilename(filename))
         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 
-        return True, info
+        return [], info
 
 
 class FFmpegFixupStretchedPP(FFmpegPostProcessor):
     def run(self, info):
         stretched_ratio = info.get('stretched_ratio')
         if stretched_ratio is None or stretched_ratio == 1:
-            return True, info
+            return [], info
 
         filename = info['filepath']
         temp_filename = prepend_extension(filename, 'temp')
@@ -621,13 +621,13 @@ def run(self, info):
         os.remove(encodeFilename(filename))
         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 
-        return True, info
+        return [], info
 
 
 class FFmpegFixupM4aPP(FFmpegPostProcessor):
     def run(self, info):
         if info.get('container') != 'm4a_dash':
-            return True, info
+            return [], info
 
         filename = info['filepath']
         temp_filename = prepend_extension(filename, 'temp')
@@ -639,7 +639,7 @@ def run(self, info):
         os.remove(encodeFilename(filename))
         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 
-        return True, info
+        return [], info
 
 
 class FFmpegSubtitlesConvertorPP(FFmpegPostProcessor):
@@ -656,7 +656,7 @@ def run(self, info):
             new_format = 'webvtt'
         if subs is None:
             self._downloader.to_screen('[ffmpeg] There aren\'t any subtitles to convert')
-            return True, info
+            return [], info
         self._downloader.to_screen('[ffmpeg] Converting subtitles')
         for lang, sub in subs.items():
             ext = sub['ext']
@@ -676,4 +676,4 @@ def run(self, info):
                     'data': f.read(),
                 }
 
-        return True, info
+        return [], info