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• How to get a online video's duration without downloading the full video ?

  8 février 2017, par David Zhuang

  To get a video’s duration and resolution, I’ve got this function :

  def getvideosize(url, verbose=False):
  
  try:
  
      if url.startswith('http:') or url.startswith('https:'):
  
          ffprobe_command = ['ffprobe', '-icy', '0', '-loglevel', 'repeat+warning' if verbose else 'repeat+error', '-print_format', 'json', '-select_streams', 'v', '-show_streams', '-timeout', '60000000', '-user-agent', BILIGRAB_UA, url]
  
      else:
  
          ffprobe_command = ['ffprobe', '-loglevel', 'repeat+warning' if verbose else 'repeat+error', '-print_format', 'json', '-select_streams', 'v', '-show_streams', url]
  
      logcommand(ffprobe_command)
  
      ffprobe_process = subprocess.Popen(ffprobe_command, stdout=subprocess.PIPE)
  
      try:
  
          ffprobe_output = json.loads(ffprobe_process.communicate()[0].decode('utf-8', 'replace'))
  
      except KeyboardInterrupt:
  
          logging.warning('Cancelling getting video size, press Ctrl-C again to terminate.')
  
          ffprobe_process.terminate()
  
          return 0, 0
  
      width, height, widthxheight, duration = 0, 0, 0, 0
  
      for stream in dict.get(ffprobe_output, 'streams') or []:
  
          if dict.get(stream, 'duration') > duration:
  
              duration = dict.get(stream, 'duration')
  
          if dict.get(stream, 'width')*dict.get(stream, 'height') > widthxheight:
  
              width, height = dict.get(stream, 'width'), dict.get(stream, 'height')
  
      if duration == 0:
  
          duration = 1800
  
      return [[int(width), int(height)], int(float(duration))+1]
  
  except Exception as e:
  
      logorraise(e)
  
      return [[0, 0], 0]

  But some online videos comes without duration tag. Can we do something to get its duration ?

• What video rendering technology is used in this type of online video synthesis platform, like lightmv,chuanying520,aimeike,hunliji？ [on hold]

  15 octobre 2019, par 崇山峻岭

  What video rendering technology is used in this type of online video synthesis platform, like :

  https://lightmv.cn/ 
  
  https://www.chuanying520.com/  
  
  https://aimeike.tv/  
  
  https://www.hunliji.com/mv/  
  
  http://www.yingdashi.cn/marriage123

• Is it possible to cut a online streaming video with ffmpeg ?

  12 mai 2019, par Sam Zorn

  Is ffmpeg able to cut out a certain part of an online video stream ? for example, I would like to cut out only the 40 - 55 minutes from a one-hour
  online streaming video.

  I am aware of how I can do this with a local one. so for example :

  ffmpeg -ss [start] -i in.mp4 -t [duration] -c:v libx264 -c:a aac -strict experimental -b:a 128k out.mp4

  the little bit I know about codecs etc tells me that it either takes disproportionately long or is not possible at all...

  if someone could give me some advice, maybe even a short explanation, I would be very grateful... :)