自学教程：python实现多个视频文件合成画中画效果

def separateMp4ToMp3(tmp):   mp4 = tmp.replace('.tmp', '.mp4')   print('---> Separate the video clip {0}'.format(mp4))   mp3 = tmp.replace('.tmp', '.mp3')   if os.path.exists(mp3):      print '/n/t{0} is detected. Skip. /n/tPlease delete .mp3 file if you need re-separate.'.format(mp3)      return   cmd = 'ffmpeg -i {0} -f mp3 -vn -loglevel fatal {1}'.format(mp4, mp3)   print '/t{0}'.format(cmd)   x = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)      for log in x.stdout.readlines():      print '[ffmpeg info] {0}'.format(log)   for log in x.stderr.readlines():      print '[ffmpeg error] {0}'.format(log)   print '/tSuccess! {0} -> {1}/n'.format(mp4, mp3)

def composeMp3ToMp3(arr = []):   if len(arr) <=0 :      print('--->Operate audio array is empty!')      return      thisDir = os.path.dirname(arr[0])   if (os.path.exists(thisDir + "/composeAudio.mp3")):      print('--->{0}/composeAudio.mp3 is exist, if you need re-gennerate,Please delete it!'.format(thisDir))      return         print('---> Compose the audio :')   var = ''   for tem in arr:      if os.path.exists(tem) == False:         print '/n/t{0} is not exist! /n/tPlease make sure audio file be exist if you need compose.'.format(tem)         return      var = var + " -i " + tem         if var == '':      print '/n/t{0} is empty. /n/tPlease check .mp3 file if you need compose.'.format(var)      return         cmd = 'ffmpeg {0} -filter_complex amix=inputs=2:duration=first:dropout_transition=2 -f mp3 -loglevel fatal {1}/composeAudio.mp3'.format(var, thisDir)   print '/t{0}'.format(cmd)   x = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)      for log in x.stdout.readlines():      print '[ffmpeg info] {0}'.format(log)   for log in x.stderr.readlines():      print '[ffmpeg error] {0}'.format(log)   print '/tSuccess! {0} -> {1}/n'.format(var, thisDir + "/composeAudio.mp3")

def composeMp4ToMp4(arr = []):   if len(arr) <= 0:      print('--->Operate video array is empty!')      return      thisDir = os.path.dirname(arr[0])   if (os.path.exists(thisDir + "/composeVideo.mp4")):      print('--->{0}/composeVideo.mp4 is exist, if you need re-gennerate,Please delete it!'.format(thisDir))      return      print('---> Compose the video :')   var = ''   temparr = []   for tem in arr:      if os.path.exists(tem) == False:         print '/n/t{0} is not exist! /n/tPlease make sure video file be exist if you need compose.'.format(tem)         return            #split image      png = tem.replace('.mp4', '.png')      tempcmd="ffmpeg -i {0} -ss 00:00:2.435 -loglevel fatal -vframes 1 {1}".format(tem, png)      print '/t{0}'.format(tempcmd)      x = subprocess.Popen(tempcmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)      x.wait()      for log in x.stdout.readlines():         print'[ffmpeg info] {0}'.format(log)      for log in x.stderr.readlines():         print'[ffmpeg error] {0}'.format(log)            img = Image.open(png)      imgSize = img.size      #ipad      if (imgSize[0] > imgSize[1]) :         temparr.append(tem)      #mobile      else:         var = var + " -i " + tem      img.close()         if (len(temparr) > 0):      for tem in temparr:         var = var + " -i " + tem      if var == '':      print '/n/t{0} is empty. /n/tPlease check video file if you need compose.'.format(var)      return      cmd = 'ffmpeg ' + var + ' -filter_complex "[1:v]scale=w=176:h=144:force_original_aspect_ratio=decrease[ckout];[0:v]' /        '[ckout]overlay=x=W-w-10:y=10[out]" -map "[out]" -movflags faststart -loglevel fatal ' + thisDir + '/composeVideo.mp4'.format(var, thisDir)   print '/t{0}'.format(cmd)   x = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)      for log in x.stdout.readlines():      print '[ffmpeg info] {0}'.format(log)   for log in x.stderr.readlines():      print '[ffmpeg error] {0}'.format(log)      print '/tSuccess!/n {0} -> {1}/n'.format(var, thisDir + "/composeVideo.mp4")

def communicateAudioVideo(folder):   if (os.path.exists(folder + "/communicateVideo.mp4")):      print('--->{0}/communicateVideo.mp4 is exist, if you need re-gennerate,Please delete it!'.format(folder))      return      if ((os.path.exists(folder + "/composeVideo.mp4") == False) or         (os.path.exists(folder + "/composeAudio.mp3") == False)):      print('--->{0}/composeVideo.mp4  or composeAudio.mp3 must be exist!'.format(folder))      return      print('---> Communicate the video :')   cmd = 'ffmpeg -i ' + folder + '/composeVideo.mp4 -i ' + folder + '/composeAudio.mp3 -f mp4 ' /         ' -loglevel fatal ' + folder +'/communicateVideo.mp4'   print '/t{0}'.format(cmd)   x = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)      for log in x.stdout.readlines():      print '[ffmpeg info] {0}'.format(log)   for log in x.stderr.readlines():      print '[ffmpeg error] {0}'.format(log)      print '/tSuccess!/n {0}  and {1} -> {2}/n'.format(folder + '/composeVideo.mp4', folder + '/composeAudio.mp3', folder +'/communicateVideo.mp4')