python通过ffmgep从视频中抽帧的方法

import os, sys
from PIL import Image
#open a pipe from a command 
a, b, c = os.popen3("ffmpeg -i test.avi")
out = c.read()
dp = out.index("Duration: ")
duration = out[dp+10:dp+out[dp:].index(",")]
hh, mm, ss = map(float, duration.split(":"))
#total time ss
total = (hh*60 + mm)*60 + ss
for i in xrange(9):
 t = int((i + 1) * total / 10)
 # ffmpeg -i test.mp4 -y -f mjpeg -ss 3 -t 1 test1.jpg 
 os.system("ffmpeg -i test.avi -y -f mjpeg -ss %s -t 1 frame%i.jpg" % (t, i))
 
"""
num=int(total-3)
i=0
for t in xrange(0,num,3):
 i = i+1
 # ffmpeg -i test.mp4 -y -f mjpeg -ss 3 -t 1 test1.jpg 
 os.system("ffmpeg -i test.avi -y -f mjpeg -ss %s -t 1 %sframe%i.jpg" % (t,t, i))
"""