+
+ def compatible_formats(formats):
+ video, audio = formats
+ # Check extension
+ video_ext, audio_ext = audio.get('ext'), video.get('ext')
+ if video_ext and audio_ext:
+ COMPATIBLE_EXTS = (
+ ('mp3', 'mp4', 'm4a', 'm4p', 'm4b', 'm4r', 'm4v'),
+ ('webm')
+ )
+ for exts in COMPATIBLE_EXTS:
+ if video_ext in exts and audio_ext in exts:
+ return True
+ # TODO: Check acodec/vcodec
+ return False
+
+ filename_real_ext = os.path.splitext(filename)[1][1:]
+ filename_wo_ext = (
+ os.path.splitext(filename)[0]
+ if filename_real_ext == info_dict['ext']
+ else filename)
+ requested_formats = info_dict['requested_formats']
+ if self.params.get('merge_output_format') is None and not compatible_formats(requested_formats):
+ info_dict['ext'] = 'mkv'
+ self.report_warning(
+ 'Requested formats are incompatible for merge and will be merged into mkv.')
+ # Ensure filename always has a correct extension for successful merge
+ filename = '%s.%s' % (filename_wo_ext, info_dict['ext'])