import re
from .common import FileDownloader
-from ..postprocessor.ffmpeg import FFmpegPostProcessor
+from ..postprocessor.ffmpeg import FFmpegPostProcessor, EXT_TO_OUT_FORMATS
from ..compat import compat_str
from ..utils import (
cli_option,
else:
args += ['-f', 'mp4', '-bsf:a', 'aac_adtstoasc']
else:
- args += ['-f', info_dict['ext']]
+ args += ['-f', EXT_TO_OUT_FORMATS.get(info_dict['ext'], info_dict['ext'])]
args = [encodeArgument(opt) for opt in args]
args.append(encodeFilename(ffpp._ffmpeg_filename_argument(tmpfilename), True))