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• parseutils : accept only full "ms" suffix

  3 mars 2018, par Rostislav Pehlivanov

  parseutils : accept only full "ms" suffix
  The commit which added those was pushed prematurely before anyone could object
  
  to illogical suffixes like just m for milliseconds. Without this, we'd be locked
  
  into never being able to implement the "m" suffix for minutes.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavutil/parseutils.c

• How to get rid of errors "jitter buffer full" in ffmpeg ?

  31 janvier 2021, par jidckii

  How to get rid of errors jitter buffer full ?
  
I use ffmpeg from one of the latest snapshots.
  
ffmpeg version N-90078-gf611fef Copyright (c) 2000-2018 the FFmpeg developers

  



  The problem is that from the camera on rtsp there is such a stream :
  
http://ibb.co/fmckCc
  
It is not possible to fix this from the camera side.

  



  I accept it like this :

  



  ffmpeg \
-strict experimental \
-fflags + genpts \
-fflags + latm \
-seek2any 1 \
-avoid_negative_ts + make_zero \
-max_delay 5000000 \
-rtsp_transport udp \
-i rtsp: // admin: @ 192.168.87.21: 554/0? .sdp \
-map 0 \
-r 15 \
-c: v copy \
-an \
-f mpegts udp: //239.0.0.1: 1234? ttl = 1? pkt_size = 1316


  



  I later start to get errors from time to time

  



  [rtsp @ 0x154d180] jitter buffer full
[rtsp @ 0x154d180] RTP: missed 1 packets
[rtsp @ 0x154d180] jitter buffer full
[rtsp @ 0x154d180] RTP: missed 1 packets
[rtsp @ 0x154d180] jitter buffer full
[rtsp @ 0x154d180] RTP: missed 2 packets
[rtsp @ 0x154d180] jitter buffer full
[rtsp @ 0x154d180] RTP: missed 4 packets


  



  because of this the picture crumbles.

  



  I increased the udp buffer in the linux kernel settings :

  



  net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.udp_mem = 8388608 12582912 16777216
net.ipv4.tcp_rmem = 4096 87380 8388608
net.ipv4.tcp_wmem = 4096 65536 8388608


  



  It did not solve my problem.
  
Tell me, how can you deal with such errors ?

  


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

  16 février 2018, 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 ?