how to skip dash manifest use python file?

[liudatutu]

python version:2.7.13 ,youtube-dl version:20170915
I want to skip dash manifest.
this is my .py file

import youtube_dl
ydl_opts ={'forcetitle':'True','ignoreerrors':True,'youtube-skip-dash-manifest':True,
'encoding':'utf-8','outtmpl':u'E:/Movie/%(title)s.%(ext)s','no_warnings':False,'skip_download':True}
with youtube_dl.YoutubeDL(ydl_opts) as ydl:
meta = ydl.extract_info( 'https://www.youtube.com/watch?v=6Kv9KGYaBP8',download=False)
print type(meta)
print meta
for i in meta:
print i,'====',meta[i]

[liudatutu]

'youtube-skip-dash-manifest':True, that does not work.

[dstftw]

youtube_include_dash_manifest.