If you do not know the media ID (a live video converted to an on-demand video using the media workflow), you can use the media input URL to query the media information over QueryMediaListByURL.

import json
from aliyunsdkmts.request.v20140618 import QueryMediaListByURLRequest
from aliyunsdkcore import client
import urllib
region = '<region>'
access_key_id = '<accessKeyId>'
access_key_secret = '<accessKeySecret>'
def queryMediaListByURL():
    global client
    client = client.AcsClient(access_key_id, access_key_secret, region)
    request = QueryMediaListByURLRequest.QueryMediaListByURLRequest()
    ossDomain = 'http://<input-bucket>.<region>.aliyuncs.com/';
    #Encode ossObject
    ossObject = encodeByRFC3986("test/The Legend of the Swordsman.mp4")
    request.set_FileURLs(ossDomain + ossObject)
    response = client.do_action_with_exception(request);
    json_response = json.loads(response)
    print json_response
def encodeByRFC3986(ossObject):
    return urllib.quote(ossObject)
if __name__ == "__main__":
    queryMediaListByURL()