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• Creating video from list of images using ffmpeg

  13 août 2019, par haseeb

  Summary

  From given code, second function taking UI values and passing to first one. from log, first two lines shows command list and command string.

  What’s irritating me is, if I copied second line from log (dos cmd) and paste it in a cmd prompt, it works successfully and produces video correctly. but running it via gui subprocess, errors out.

  Task Description

  Directory contains thousand of images each after few minutes of a construction project. I need to create a video from data (images) per day basis. I have successfully extracted list of images, etc, and have data.

  utils.py :

  def framesToVideoViaCount(srcFile,outputFile,start,count,rate):
  
      # ffmpeg -start_number 1 -i test_%04d.png -vframes 100 -vcodec mpeg4 test.mp4
  
      # "C:\\Users\\lalat\\Desktop\\03008427633\\output_%04d.png"
  
      # ffmpeg -start_number 50 -i "C:\\Users\\lalat\\Desktop\\03008427633\\output_%04d.png" -vframes 200 -vcodec mpeg4 "C:\\Users\\lalat\\Desktop\\day1.mp4"
  
      command = [ 'ffmpeg',
  
                  # '-loglevel', 'fatal',
  
                  '-r %d' %(rate),
  
                  '-start_number %d' %(start) ,
  
                  '-i "%s"' %(srcFile),
  
                  '-vframes %d' %(count),
  
                  '-vcodec mpeg4' ]
  
      # command.append ('fps=%d' % (fps))
  
      command.append (outputFile)
  
      print ("COMMAND: " , command)
  
      print ("DOS CMD: ", ' '.join(command))
  
      ffmpeg = subprocess.Popen(command, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE )
  
      out, err = ffmpeg.communicate()
  
      if(err) : print('error',err); return None;
  
      print (out)

  Actual GUI function call in tk gui app :

  def approachByCount(self):
  
      tdate = datetime(year=int(self.fyear.get()), month=int(self.fmonth.get()), day=int(self.fdate.get()))
  
      # now = datetime.datetime.now()
  
      outputName = str(tdate.strftime("%Y%m%d")) + ".txt"
  
      outputVid = str(tdate.strftime("%Y%m%d")) + ".mp4"
  
      files = os.listdir(self.userDir)
  
      selected = []
  
      for afile in files:
  
          afile = os.path.join(self.userDir,afile)
  
          sdate = datetime.fromtimestamp(os.path.getmtime(afile))
  
          if sdate.date() == tdate.date():
  
              selected.append(afile)
  
      # get first file name
  
      srcfilename = os.path.basename(selected[0])
  
      srcfilename,ext = srcfilename.split(".")
  
      filename,pad = srcfilename.split("_")
  
      srcfilename = os.path.join(self.userDir,filename+"_%0"+str(len(pad))+"d."+ext)
  
      start = int(pad)
  
      count = len(selected)
  
      utils.framesToVideoViaCount(srcfilename,outputVid,start,count,25)

  ERROR log

  COMMAND:  ['ffmpeg', '-r 25', '-start_number 1', '-i "C:\\Users\\lalat\\Desktop\\03008427633\\output_%04d.png"', '-vframes 382', '-vcodec mpeg4', '20190810.mp4']
  
  DOC CMD:  ffmpeg -r 25 -start_number 1 -i "C:\Users\lalat\Desktop\03008427633\output_%04d.png" -vframes 382 -vcodec mpeg4 20190810.mp4
  
  
  
  error b"ffmpeg version 4.1 Copyright (c) 2000-2018 the FFmpeg developers\r\n
  
  built with gcc 8.2.1 (GCC) 20181017\r\n
  
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth\r\n
  
  libavutil      56. 22.100 / 56. 22.100\r\n
  
  libavcodec     58. 35.100 / 58. 35.100\r\n
  
  libavformat    58. 20.100 / 58. 20.100\r\n
  
  libavdevice    58.  5.100 / 58.  5.100\r\n
  
  libavfilter     7. 40.101 /  7. 40.101\r\n
  
  libswscale      5.  3.100 /  5.  3.100\r\n
  
  libswresample   3.  3.100 /  3.  3.100\r\n
  
  libpostproc    55.  3.100 / 55.  3.100\r\n
  
  Unrecognized option 'r 25'.\r\n
  
  Error splitting the argument list: Option not found\r\n"

• avformat/utils : Preserve integrity of linked list

  19 août 2019, par Andreas Rheinhardt

  avformat/utils : Preserve integrity of linked list
  1. Instead of relying on ff_packet_list_get to get the oldest element in
  
  an AVPacketList, ff_read_packet used its own ad-hoc code. Said code
  
  forgot to set the end of the list to NULL if the last element of the
  
  list has been removed, thereby leaving the list in an inconsistent state.
  
  2. Furthermore, if the list was not empty, the oldest element of the
  
  list would always be copied into another packet structure before it was
  
  known whether the oldest entry of the list would be removed. This makes
  
  the ownership confusing and potentially copies unnecessarily.
  Both of these issues have been fixed. ff_packet_list_get is used now.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/utils.c

• FFMPEG Concatenate X video at time from a list.txt

  25 octobre 2019, par Lorenzo Castagnone

  I’m trying to concatenate 3 videos at time from a list.txt, i can concatenate all the videos in the list in a single long video, but i wish to concatenate x videos from the list in a single output, then concatenate the next x videos from the same list in another single output and so on.

  The script i’m developing it’s written in python, it fetches some videos from a server and save them locally in a folder and write my concat.txt, then ffmpeg read the concat.txt and create a single output.mp4

  #this merge all video in concat file in a single output
  
  os.system("ffmpeg -f concat -i downloaded/concat.txt -safe 1 -r 30 -fflags +genpts -c:a copy downloaded/output.mp4")

  I’m looking for a way to make ffmpeg read the first x row from the concat.txt , concatenate them in output1.mp4, then read the next x row from cancat.txt , concatenate them in output2.mp4 and so on.

  Thank you for your time to help me, i really appreciate that !

  ---EDIT
  Thank to @Tejas for the reply, i solved how to split the concat.txt file, now i’m trying to apply a filter to every clip

  import os
  
  x = 3 #Number of files you want to concatenate
  
  
  
  #Making directories so that the working directory stays organized
  
  txtFileName = "./splits/output{}.txt"
  
  outputFile = "./clip/output{}.mp4"
  
  postFile = "./media/post{}.mp4"
  
  os.makedirs(os.path.dirname(txtFileName), exist_ok=True)
  
  os.makedirs(os.path.dirname(outputFile), exist_ok=True)
  
  os.makedirs(os.path.dirname(postFile), exist_ok=True)
  
  
  
  
  
  #While splitting the files store their path to a list
  
  listofSplitFiles = []
  
  with open('./downloaded/concat.txt','r') as concat:
  
      lines = concat.readlines()
  
      for i in range(0,lines.__len__()//x):
  
          with open(txtFileName.format(i+1),'w') as split:
  
              listofSplitFiles.append(txtFileName.format(i+1))
  
              for j in range(0,x):
  
                  if( (i*x)+j < lines.__len__() ):
  
                      split.write(lines[(i*x)+j])
  
  
  
  #Call ffmpeg on the list
  
  for i in listofSplitFiles:
  
      outputBaseName = os.path.basename(i)
  
      outputFileName = os.path.splitext(outputBaseName)[0]
  
      postFileName = os.path.splitext(outputBaseName)[0]
  
      os.system("ffmpeg -f concat -i {} -safe 1 -r 30 -fflags +genpts -c:a copy ./clip/{}.mp4".format(i,outputFileName))
  
      os.system('''ffmpeg -loglevel error -r 30 -i sfondo/bkg.png -i ./clip/output{}.mp4 -b:v 1M -filter_complex ''' + '''"[1:v]scale=''' + "750" + ''':''' + "1080" + ''' [ovrl], [0:v][ovrl]overlay=(main_w-overlay_w)/2:((main_h-overlay_h)/2)"''' + ''' ./media/{}.mp4''' .format(outputFileName,postFileName)) 

  Unfortunately i have this error ./clip/{}.mp4: No such file or directory