如何获得.avi文件的长度

Question

我试图循环子文件夹的目录,其中每个文件夹包含一个.avi文件,我想在几秒钟内检索其长度.

我发现PyMedia http://pymedia.org/,我知道它可能帮助我实现这一点,但我在文档中找不到任何关于avi持续时间/长度的信息.

我怎么能这样做？另外,如果有某种不同的图书馆,我想知道.

编辑:添加了我的最终解决方案,感谢JF Sebastian

import sys
import glob
import os

from hachoir_core.cmd_line import unicodeFilename
from hachoir_core.i18n import getTerminalCharset
from hachoir_metadata import extractMetadata
from hachoir_parser import createParser

path = "z:\*"
for fpath in glob.glob(os.path.join(path, '*avi')):
    filename = fpath
    filename, real_filename = unicodeFilename(filename), filename
    parser = createParser(filename, real_filename=real_filename)
    metadata = extractMetadata(parser)
    print fpath
    print("Duration (hh:mm:ss.f): %s" % metadata.get('duration'))
    print '\n'

Answer 1

您可以使用hachoir-metadata从文件中提取avi持续时间:

#!/usr/bin/env python
import sys

# $ pip install hachoir-{core,parser,metadata}
from hachoir_core.cmd_line import unicodeFilename
from hachoir_core.i18n import getTerminalCharset
from hachoir_metadata import extractMetadata
from hachoir_parser import createParser


filename = sys.argv[1]
charset = getTerminalCharset()
filename, real_filename = unicodeFilename(filename, charset), filename
parser = createParser(filename, real_filename=real_filename)
metadata = extractMetadata(parser)
print("Duration (hh:mm:ss.f): %s" % metadata.get('duration'))

它使用纯Python RIFF解析器从avi文件中提取信息.

例:

$ get-avi-duration.py test.avi
Duration (hh:mm:ss.f): 0:47:03.360000

这是ffmpeg的比较输出:

$ ffmpeg -i test.avi |& grep -i duration
  Duration: 00:47:03.36, start: 0.000000, bitrate: 1038 kb/s

要打印有关目录树中所有avi文件的信息:

#!/usr/bin/env python
import os
import sys
from hachoir_metadata import extractMetadata
from hachoir_parser import createParser

def getinfo(rootdir, extensions=(".avi", ".mp4")):
    if not isinstance(rootdir, unicode):
       rootdir = rootdir.decode(sys.getfilesystemencoding())
    for dirpath, dirs, files in os.walk(rootdir):
        dirs.sort() # traverse directories in sorted order
        files.sort()
        for filename in files:
            if filename.endswith(extensions):
               path = os.path.join(dirpath, filename)
               yield path, extractMetadata(createParser(path))

for path, metadata in getinfo(u"z:\\"):
    if metadata.has('duration'):
        print(path)
        print("  Duration (hh:mm:ss.f): %s" % metadata.get('duration'))