python 法律檢索，python數據檢索_python – Hachoir – 從組中檢索數據

對于WMV文件來說,這似乎不那么簡單.我已將此類視頻的元數據轉換為defaultdict,現在獲取圖像寬度更為簡單：

python 法律檢索，from collections import defaultdict

from pprint import pprint

from hachoir_metadata import metadata

from hachoir_core.cmd_line import unicodeFilename

from hachoir_parser import createParser

# using this example http://archive.org/details/WorkToFishtestwmv

filename = './test_wmv.wmv'

filename, realname = unicodeFilename(filename), filename

parser = createParser(filename)

# See what keys you can extract

for k,v in metadata.extractMetadata(parser)._Metadata__data.iteritems():

if v.values:

print v.key, v.values[0].value

# Turn the tags into a defaultdict

metalist = metadata.extractMetadata(parser).exportPlaintext()

meta = defaultdict(defaultdict)

for item in metalist:

if item.endswith(':'):

k = item[:-1]

else:

tag, value = item.split(': ')

tag = tag[2:]

meta[k][tag] = value

print meta['Video stream #1']['Image width'] # 320 pixels