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• lavf : Only initialize s->offset once when using avoid_negative_ts make_zero

  17 novembre 2014, par Martin Storsjö

  lavf : Only initialize s->offset once when using avoid_negative_ts make_zero
  When given a stream starting at dts=0, it would previously consider
  
  s->offset as uninitialized and set an offset when the second packet
  
  was written, ending up writing two packets with dts=0. By initializing
  
  this field to AV_NOPTS_VALUE, we make sure that we only initialize it
  
  once, on the first packet.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/mux.c
  • [DBH] libavformat/options.c

• i have this code. It is supposed to classify the segment files with the ratings in sys.argv[5].But it keeps having error

  3 août 2014, par Darkace435

  I have the following code tha uses FFmpeg . It has 5 argv and it takes in filename,video,segment size, start time, end time, ratings. thats supposed to let me classify segments many times with my ratings "PG G M18..." but there’s this error,

  "File "C:\c.py",line 92, in <module> os.rename<filename filename="filename" the="the" system="system" cannot="cannot" find="find" the="the" file="file"></filename>code></module>

  Ive tried to edit many times but this error still persists. Anyone have any idea what could this error mean and anyway to solve it ?

  import sys
  
  import subprocess
  
  import os
  
  
  
  #change hh:mm:ss to seconds:
  
  def getSeconds(sec):
  
      l = sec.split(':')
  
      return int(l[0])* 3600 + int(l[1])* 60 + float(l[2])
  
  
  
  def get_total_time(filename):
  
  
  
      proc = subprocess.Popen(["ffmpeg", "-i", filename], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  
      lines = proc.communicate()[1]
  
      target = [line for line in lines.split('\n') if 'Duration:' in line][0]
  
      time = target.split('Duration: ')[-1].split(',', 1)[0]
  
      return time
  
  
  
  
  
  #check command line arguments
  
  if len(sys.argv) < 5:
  
      print "Error: not enough arguments"
  
      sys.exit()
  
  
  
  #save filename to file_name
  
  file_name = sys.argv[1]
  
  if not file_name.endswith('mpg'):
  
      print 'Error! File extension not supported'
  
      sys.exit()
  
  # save a size of chunk in chunk
  
  segsize = int(sys.argv[2])
  
  chunk = (segsize * 1024)
  
  
  
  # get time of starting censorship in seconds
  
  start_censorship = getSeconds(sys.argv[3])
  
  
  
  # get time of ending censorship in seconds
  
  end_censorship   = getSeconds(sys.argv[4])
  
  
  
  classification = sys.argv[5]
  
  if classification not in ['P','PG','G','NC16','M18','R21']:
  
      print "Error: invalid classification"
  
      sys.exit()
  
  
  
  #initialize variable for extension 
  
  file_ext = ''
  
  
  
  
  
  # if extension exists then save it into file_ext
  
  if '.' in file_name:
  
      # split file_name on two parts from right
  
      file_ext = sys.argv[1].split('.')[-1]
  
  
  
  
  
  # file_name without extension    
  
  filename = '.'.join(file_name.split('.')[:-1])
  
  
  
  # total_time of file in seconds
  
  total_time = getSeconds(get_total_time(file_name))
  
  
  
  print total_time
  
  
  
  
  
  
  
  #open file    
  
  in_file = open(file_name,'rb')
  
  
  
  
  
  #read first chunks
  
  s = in_file.read(chunk)
  
  
  
  in_file.seek(0, 2)
  
  file_size = in_file.tell()
  
  chunks = (file_size / chunk) + 1
  
  
  
  chunk_time = total_time/ file_size * chunk
  
  
  
  #close input file    
  
  in_file.close()
  
  
  
  #loop for each chunk
  
  for x in range(0, chunks):
  
      # starting time of current chunk
  
      t1 = chunk_time*x
  
      # ending time of current chunk    
  
      t2 = chunk_time*(x+1)
  
  
  
      if t2 < start_censorship or t1 > end_censorship:
  
          pass
  
      else:
  
          if os.path.exists(filename + str(x) + 'x'):
  
              os.rename(filename + str(x) + 'x', filename + str(x))
  
          os.rename(filename + str(x), filename + str(x) + classification)
  
  
  
      #read next bytes

• Create thumbnails tile for time range of video

  6 mars 2024, par Dmitrii Mikhailov

  I need to create, let's say, 12 thumbnails from video, but skip 10 percent in the beginning and in the ending. I found this thing, but it just takes every 1000th frame. In my case this range will be variable and it will be better if it will be in seconds. Can't figure out how to do this with ffmpeg, don't work with it much.