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• Having trouble obtaining the time from RTP Timestamps obtained through OpenCV

  24 août 2019, par Fr0sty

  I am finding it a bit difficult trying to understand whether or not the hack around with FFmpeg and OpenCV really provided a RTP timestamp. My last post helped a little bit but got me stuck in trying to validate the timestamps obtained through this work around by modifying ffmpeg and opencv.

  FFmpeg version : 4.1.0
  OpenCV version : 3.4.1

  import cv2
  
  import time
  
  from datetime import datetime, date
  
  
  
  uri = 'rtsp://admin:password@192.168.1.66:554/Streaming/Channels/101'
  
  cap = cv2.VideoCapture(uri)
  
  '''One is the offset between the two epochs. Unix uses an epoch located at 1/1/1970-00:00h (UTC) and NTP uses 1/1/1900-00:00h.
  
  This leads to an offset equivalent to 70 years in seconds (there are 17 leap years between the two dates so the offset is'''
  
  time_offset = 2208988800 # (70*365 + 17)*86400 = 2208988800 (in seconds)
  
  # offset = 3775484294
  
  days = 43697
  
  pdat = "1900-01-01 00:00:00:00"
  
  mdat = "2019-08-23 22:02:44:00" # str(datetime.now()) + str(datetime.now().time())
  
  pdate = datetime.strptime(pdat, "%Y-%m-%d %H:%M:%S:%f").date()
  
  mdate = datetime.strptime(mdat, "%Y-%m-%d %H:%M:%S:%f").date()
  
  delta = (mdate - pdate).days
  
  offset = delta * 86400
  
  def time_delta(s):
  
      return (s - time_offset)
  
  
  
  while True:
  
      frame_exists, curr_frame = cap.read()
  
      if frame_exists:
  
          seconds = cap.getRTPTimeStampSeconds()
  
          fraction = cap.getRTPTimeStampFraction()
  
          timestamp = cap.getRTPTimeStampTs()
  
          unix_offset = seconds - time_offset
  
          msec = int((int(fraction) / 0xFFFFFFFF) * 1000.0)
  
          ts = float(str(unix_offset) + "." + str(msec))
  
          # print("Timestamp per Frame:%i" % timestamp)
  
          print((datetime.fromtimestamp(float(ts) + offset)))
  
  cap.release()

  My Output :

  On August 23, 2019 at 22:02

  ...
  
  2019-08-23 13:59:52.781000
  
  2019-08-23 13:59:52.726000
  
  2019-08-23 13:59:52.671000
  
  2019-08-23 13:59:52.616000
  
  2019-08-23 13:59:52.561000
  
  2019-08-23 13:59:52.506000
  
  2019-08-23 13:59:52.451000
  
  2019-08-23 13:59:52.396000
  
  2019-08-23 13:59:52.342000
  
  2019-08-23 13:59:52.287000
  
  2019-08-23 13:59:52.232000
  
  2019-08-23 13:59:52.177000
  
  2019-08-23 13:59:52.122000
  
  2019-08-23 13:59:52.067000
  
  2019-08-23 13:59:52.012000
  
  2019-08-23 13:59:53.570000
  
  2019-08-23 13:59:53.020000
  
  2019-08-23 13:59:53.847000
  
  2019-08-23 13:59:53.792000

  I’ve noticed how the time increments weirdly (that’s not suppose to happen in the real, current time), such as the last two lines and a few others in between in the output. A bit flabbergasted as to what went wrong. Also trying this out on multiple IP cameras, with each showing a different timestamp probably related to when they were turned on.

• ffmpeg - over 1000 files into a mp4

  20 octobre 2013, par Fabrizio

  I am using FreeBSD and ffmpeg and I am trying to convert over 1000 files into an mp4. Keep in mind that I am completely NEW to ffmpeg and that in the future I might have up to 3600 images.

  I was thinking that simply executing :

  ffmpeg -i /usr/local/www/tmp/phpFa5LT3/*.jpg -r 2 output.mp4

  would work, but I keep getting

  ffmpeg version 0.7.12, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Jun  9 2013 12:48:13 with gcc 4.2.1 20070831 patched [FreeBSD]
  
    configuration: --prefix=/usr/local --mandir=/usr/local/man --enable-shared --enable-gpl --enable-postproc --enable-avfilter --enable-pthreads --enable-memalign-hack --enable-runtime-cpudetect --cc=cc --extra-cflags='-msse -I/usr/local/include/vorbis -I/usr/local/include' --extra-ldflags='-L/usr/local/lib ' --extra-libs=-pthread --disable-debug --disable-libaacplus --disable-indev=alsa --disable-outdev=alsa --disable-libopencore-amrnb --disable-libopencore-amrwb --disable-libcelt --disable-libdirac --disable-libfaac --enable-libfreetype --enable-frei0r --disable-libgsm --disable-libmp3lame --enable-libopencv --enable-libopenjpeg --disable-librtmp --enable-libschroedinger --disable-ffplay --disable-libspeex --enable-libtheora --disable-vaapi --disable-vdpau --disable-libvo-aacenc --disable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid
  
    libavutil    50. 43. 0 / 50. 43. 0
  
    libavcodec   52.123. 0 / 52.123. 0
  
    libavformat  52.111. 0 / 52.111. 0
  
    libavdevice  52.  5. 0 / 52.  5. 0
  
    libavfilter   1. 80. 0 /  1. 80. 0
  
    libswscale    0. 14. 1 /  0. 14. 1
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  Input #0, image2, from '20131019205500.jpg':
  
    Duration: 00:00:00.50, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: mjpeg, yuvj420p, 320x240 [PAR 96:96 DAR 4:3], 2 tbr, 2 tbn, 2 tbc
  
  Too many output files

  When I try :

  ffmpeg -y -f image2 -r 4 -i /usr/local/www/tmp/phpFa5LT3/%14d.jpg output.mp4

  I get :

  [same output but last line reads]
  
  /usr/local/www/tmp/phpFa5LT3/%12d.jpg: No such file or directory

  If I reduce the number of files to just a 100 or so, I can do it without any problems... Do you know what the problem might be ?

  #ulimit -a
  
  cpu time               (seconds, -t)  unlimited
  
  file size           (512-blocks, -f)  unlimited
  
  data seg size           (kbytes, -d)  33554432
  
  stack size              (kbytes, -s)  524288
  
  core file size      (512-blocks, -c)  unlimited
  
  max memory size         (kbytes, -m)  unlimited
  
  locked memory           (kbytes, -l)  unlimited
  
  max user processes              (-u)  5547
  
  open files                      (-n)  230400
  
  virtual mem size        (kbytes, -v)  unlimited
  
  swap limit              (kbytes, -w)  unlimited
  
  sbsize                   (bytes, -b)  unlimited
  
  pseudo-terminals                (-p)  unlimited

• ffmpeg wave audio and avi video format merge

  12 mai 2016, par Eranga Dayarathne

  when i used in cmd for merge that it merge successfully ,here is sample code,

  ffmpeg -i "D :\Developments\Video Capture\My video capture\WindowsFormsApplication1\bin\Debug\Video\uuu.wav" -i "D :\Developments\Video Capture\My video capture\WindowsFormsApplication1\bin\Debug\Video\1.avi" -acodec copy -vcodec copy "D :\Developments\Video Capture\My video capture\WindowsFormsApplication1\bin\Debug\Video\output.avi"

  but here is sample code i used in c# application form,

     string Path_FFMPEG = Application.StartupPath + "\\ffmpeg.exe";
  
          string Wavefile = Application.StartupPath + "\\Video\\uuu.wav";
  
          string video1 = Application.StartupPath + "\\Video\\1.avi";
  
          string file = Application.StartupPath + "\\Video\\text.txt";
  
          string strResult = Application.StartupPath + "\\Video\\output.avi";
  
          System.Diagnostics.Process proc = new System.Diagnostics.Process();
  
          try
  
          {
  
  
  
              proc.StartInfo.FileName = Path_FFMPEG;
  
              proc.StartInfo.Arguments = string.Format("ffmpeg -i {0} -i {1} -acodec copy -vcodec copy {2}", Wavefile, video1, strResult); 
  
              proc.StartInfo.UseShellExecute = false;
  
              proc.StartInfo.CreateNoWindow = false;
  
              proc.StartInfo.RedirectStandardOutput = true;
  
              proc.StartInfo.RedirectStandardError = true;
  
  
  
              proc.Start();
  
  
  
              string StdOutVideo = proc.StandardOutput.ReadToEnd();
  
              string StdErrVideo = proc.StandardError.ReadToEnd();
  
          }
  
          catch { }
  
          finally
  
          {
  
              proc.WaitForExit();
  
              proc.Close();
  
          }

  here is outpu error....

  FFmpeg version SVN-r23607, Copyright (c) 2000-2010 the FFmpeg developers
  built on Jun 15 2010 04:09:35 with gcc 4.4.2
  configuration : —target-os=mingw32 —enable-runtime-cpudetect —enable-avisynth —enable-gpl —enable-version3 —enable-bzlib —enable-libgsm —enable-libfaad —enable-pthreads —enable-libvorbis —enable-libtheora —enable-libspeex —enable-libmp3lame —enable-libopenjpeg —enable-libxvid —enable-libschroedinger —enable-libx264 —extra-libs=’-lx264 -lpthread’ —enable-libopencore_amrwb —enable-libopencore_amrnb —enable-librtmp —extra-libs=’-lrtmp -lpolarssl -lws2_32 -lwinmm’ —arch=x86 —cross-prefix=i686-mingw32- —cc=’ccache i686-mingw32-gcc’ —enable-memalign-hack
  libavutil 50.19. 0 / 50.19. 0
  libavcodec 52.76. 0 / 52.76. 0
  libavformat 52.68. 0 / 52.68. 0
  libavdevice 52. 2. 0 / 52. 2. 0
  libavfilter 1.20. 0 / 1.20. 0
  libswscale 0.11. 0 / 0.11. 0
  Unable to find a suitable output format for ’ffmpeg’

  please help me to fix this problem..