1. 剪切：

./ffmpeg -ss 00:00:06 -t 00:00:12 -i input.mp4 -vcodec copy -acodec copy output.mp4

意思是從截取從6秒開始，時長為12秒的視頻，格式不變，

輸入為input.mp4

輸出為output.mp4

-vcodec copy -acodec copy : 編碼格式不變

2. 合并：

mp4的合并最好是先轉成無損質量的ts，再合并(如果直接合并，會有些小bug)

./ffmpeg -i 1.mp4 -vcodec copy -acodec copy -vbsf h264_mp4toannexb 1.ts

./ffmpeg -i 2.mp4 -vcodec copy -acodec copy -vbsf h264_mp4toannexb 2.ts

./ffmpeg -i "concat:1.ts|2.ts" -acodec copy -vcodec copy -absf aac_adtstoasc output.mp4

還有就是關于-s選項的解釋：

‘-ss position (input/output)’

When used as an input option (before -i), seeks in this input file to position. When used as an output option (before an output filename), decodes but discards input until the timestamps reach position. This is slower, but more accurate.

position may be either in seconds or in hh:mm:ss[.xxx] form.

意思就是如果要把-ss作為輸入選項的話要放在-i之前，當做輸出選項的話放在輸出文件之前。我們這是要截取一段視頻，應該當做輸入選項，所以-ss要在-i之前才有效，不然會花費很長一段時間來尋找-ss。

3. 批處理(python腳本實現)

主要是實現用自動化工具，將視頻切割成比如2分鐘的很多小視頻文件；

事情的由來是我看到一個youtube的視頻不錯，因為墻的原因不能分享，但是原文件比較大(有200多M)不能發微信(限定是20M以內)，所以造了這個輪子；

1.png

# coding=gb2312

import string

import os

import time

import re

import math

import sys

from optparse import OptionParser

print "Test by gongjia start..."

parser = OptionParser()

parser.add_option("-i", "--input", dest="input",action="store_true",help="input x y for each file by user")

parser.add_option("-q", "--quality", dest="q",action="store",help="input xvid q arg",default="24")

parser.add_option("-v", "--vcodec", dest="vcodec",action="store",help="input video codec",default="x264")

parser.add_option("-n", "--noaudio", dest="an",action="store_true",help="no audio")

parser.add_option("-p", "--preset", dest="preset",action="store",help="",default="")

parser.add_option("-m", "--maxWidth", dest="maxWidth",action="store",help="input max width for output video",default="")

parser.add_option("-f", "--fileType", dest="fileType",action="store",help="",default="mp4")

parser.add_option("-o", "--ogg", dest="ogg",action="store_true",help="user ogg instead of aac",default="")

parser.add_option("-3", "--mp3", dest="mp3",action="store_true",help="user mp3 instead of aac",default="")

parser.add_option("-1", "--pad", dest="pad",action="store_true",help="pad to 16:9",default="")

parser.add_option("-s", "--src", dest="srcD",action="store",help="source dir",default="/home/gongjia/external/ffmpeg/ffmpeg-x86/videoin")

parser.add_option("-t", "--target", dest="targetD",action="store",help="target dir",default="/home/gongjia/external/ffmpeg/ffmpeg-x86/videoout")

parser.add_option("-w", "--workdir", dest="workdir",action="store",help="work dir",default="/home/gongjia/external/ffmpeg/ffmpeg-x86/video")

parser.add_option("-e", "--split", dest="split",action="store_true",help="split to multiple file with size")

parser.add_option("-d", "--splitsize", dest="splitsize",action="store",help="split to multiple file with size",default="2")#Minutes

parser.add_option("-j", "--prefix", dest="prefix",action="store",help="target file name prefix",default="")

(options, args) = parser.parse_args()

if options.srcD==None or options.srcD[0:1]=='-':

print 'srcD Err, quit'

exit()

if options.targetD==None or options.targetD[0:1]=='-':

print 'targetD Err, quit'

exit()

if options.fileType==None or options.fileType[0:1]=='-':

print 'fileType Err, quit'

exit()

if options.workdir==None or options.workdir[0:1]=='-':

print 'workdir Err, quit'

exit()

#遍歷videoin下的文件

for root,dirs,files in os.walk(options.srcD):

for name in files:

name= name.replace('[','''\[''')#對文件名中的[進行轉義

newname =name[0: name.rindex('.')]

print "Test newname: " + newname

print "Test name: " + name

#運行

cmd ='cd '+options.workdir+';mkdir -p ffm; rm -f ffm/ffm.txt ; csh -c "(ffmpeg -i '+options.srcD+'/' +name+ ' >& ffm/ffm.txt)"; grep Duration ffm/ffm.txt'

print cmd

(si, so, se) = os.popen3(cmd)

t=so.readlines()

reg='''Duration\:\s(\d+)\:(\d+)\:([\d\.]+)'''

duration=0#second

for line in t:

result = re.compile(reg).findall(line)

for c in result:

print 'split file to',options.splitsize,'minutes, Duration:',c[0],c[1],c[2]

duration = int(c[0])*3600 + int(c[1])*60+float(c[2])

nameLength=int(math.log(int(duration / (int(options.splitsize)*60)) )/math.log(10)) + 1

for i in range(int(duration / (int(options.splitsize)*60)) + 1):

print i

_t = ''

if duration>int(options.splitsize)*60*(i+1):

_t = str(int(options.splitsize)*60)

else:

_t = str(duration-int(options.splitsize)*60*i)

cmd ='csh -c "' + "cd "+options.workdir+";touch ffm/output.log;(ffmpeg -y -i "+options.srcD+"/"+name+" -codec: copy -ss "+str(i*int(options.splitsize)*60)+" -t "+_t+" "+options.targetD+"/"+options.prefix+newname+'_'+string.replace(('%'+str(nameLength)+'s')%str(i),' ','0')+"."+options.fileType + ' >>& ffm/output.log)"'

print cmd

(si, so, se) = os.popen3(cmd)

for line in se.readlines() :#打印輸出

print line

總結

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