我正在慢慢地尝试将旧的python 2代码转换为Python 3,但是我遇到了包含以下代码的障碍:
seconds = functools.reduce(lambda x,y:x*60+y,map(int,duration.split(":")))
哪位给了我:
TypeError:'str'不支持缓冲区接口
我把它改为:
b'functools.reduce(lambda x,y:x*60+y,map(int,duration.split(":")))'
这使得以下行rate = frames/seconds
给了我这个错误:
TypeError:/:'float'和'bytes'
的不支持的操作数类型
所以我尝试将原始字符串转换为像这样的
seconds = float(functools.reduce(lambda x,y:x*60+y,map(int,duration.split(":"))))
但这只是导致了
TypeError:'str'不支持缓冲区接口
任何人都可以看看吗?
import sys,os,re
import functools
from subprocess import *
if len(sys.argv)<=1:
print ("usage: python oneinn.py filename frames")
sys.exit(0)
try:
fvideo = sys.argv[1]
frames = float(sys.argv[2])
except:
sys.stderr.write("Failed to parse parameters.\n")
sys.exit(1)
output = Popen(["ffmpeg", "-i", fvideo], stderr=PIPE).communicate()
# searching and parsing "Duration: 00:05:24.13," from ffmpeg stderr, ignoring the centiseconds
re_duration = re.compile("Duration: (.*?)\.")
duration = b're_duration.search(output[1]).groups()[0]'
seconds = float(functools.reduce(lambda x,y:x*60+y,map(int,duration.split(":"))))
rate = frames/seconds
print ("Duration = %s (%i seconds)" % (duration, seconds))
print ("Capturing one frame every %.1f seconds" % (1/rate))
output = Popen(["ffmpeg", "-i", fvideo, "-r", str(rate), "-vcodec", "png", 'Preview-%d.png']).communicate()