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• ffmpeg : Time information does not match video duration

  8 novembre 2017, par Harry Developer

  I’m using tvheadend to record broadcasts to disc (running ubuntu). Later, I’m playing the files using players like MX Videoplayer or IJK player. Sometimes, the time information of the media files is weired. E.g., using

  ffprobe -i some-file.ts

  shows a lenght of 10 hours or even 20 hours, although the recording is only 2 hours long. Is this a ffmpeg bug ? What can be done to get the correct media length ?

  Here is the ffprobe output of the original file after recording it on disc :

  ffprobe version N-85175-ga434657 Copyright (c) 2007-2017 the FFmpeg developers
  
    built with gcc 4.9.2 (Raspbian 4.9.2-10)
  
    configuration:
  
    libavutil      55. 59.100 / 55. 59.100
  
    libavcodec     57. 90.100 / 57. 90.100
  
    libavformat    57. 72.100 / 57. 72.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 83.100 /  6. 83.100
  
    libswscale      4.  7.100 /  4.  7.100
  
    libswresample   2.  8.100 /  2.  8.100
  
  [mp3 @ 0x24caef0] Header missing
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 1 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
      Last message repeated 3 times
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 1 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
      Last message repeated 1 times
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 1 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
      Last message repeated 1 times
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 1 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 9 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
      Last message repeated 1 times
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 1 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 11 times
  
  [mpeg2video @ 0x24817b0] Invalid frame dimensions 0x0.
  
  [mp3 @ 0x24caef0] Header missing
  
      Last message repeated 318 times
  
  [mpegts @ 0x247cd40] decoding for stream 4 failed
  
  [mpegts @ 0x247cd40] start time for stream 3 is not set in estimate_timings_from_pts
  
  [mpegts @ 0x247cd40] PES packet size mismatch
  
      Last message repeated 2 times
  
  [mpegts @ 0x247cd40] Could not find codec parameters for stream 4 (Audio: mp3, 0 channels, s16p): unspecified frame size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, mpegts, from '30d0b11f21ce831b56cc306d9c4a18c0.backup':
  
    Duration: 10:03:33.54, start: 60774.296367, bitrate: 1883 kb/s
  
    Program 12101
  
      Metadata:
  
        service_name    : ?RTL Television
  
        service_provider: ?Unitymedia
  
      Stream #0:0[0x20b]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
  Stream #0:1[0x20c](ger): Audio: mp2 ([4][0][0][0] / 0x0004), 48000 Hz, stereo, s16p, 192 kb/s
  
  Stream #0:2[0x20d](ger): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, fltp, 384 kb/s
  
  Stream #0:3[0x60f](ger): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
  
    No Program
  
  Stream #0:4[0x210]: Audio: mp3, 0 channels, s16p

  Here is the output of ffprobe somefile -show_entries stream=index,start_time,duration -of compact -v 0 :

  program|stream|index=0|start_time=88858.718567|duration=8129.120000
  
  stream|index=1|start_time=88858.104267|duration=8129.496000
  
  stream|index=2|start_time=88858.104289|duration=8129.498833
  
  stream|index=3|start_time=60774.296367|duration=36213.542200
  
  
  
  stream|index=0|start_time=88858.718567|duration=8129.120000
  
  stream|index=1|start_time=88858.104267|duration=8129.496000
  
  stream|index=2|start_time=88858.104289|duration=8129.498833
  
  stream|index=3|start_time=60774.296367|duration=36213.542200
  
  stream|index=4|start_time=60774.296367|duration=8129.520000

• Mjpeg recording with FFMPEG preserving time information

  14 septembre 2012, par Muhammad Adeel Zahid

  I am recording the MJPEG video from an IP camera and saving it to a file but the problem is that file's duration is way smaller than the actual recording time. Its around 9 seconds video for 2 minutes recording. I tried following commands in order

  ffmpeg -f mjpeg -r 8 -i http://c-cam.uchicago.edu/mjpg/video.mjpg -vcodec mpeg4 -b 1000000 -r 8 video_file.avi 

  Then I omitted the most of the flags and tried like this

  ffmpeg -f mjpeg -i http://c-cam.uchicago.edu/mjpg/video.mjpg video_file.avi

  But the problem is that the duration of recorded file is 9 seconds where as the actual recording time is around 2 minutes. I finally tried setpts filter that is supposed to insert the timestamps. The command is as follows

  ffmpeg -f mjpeg -i http://c-cam.uchicago.edu/mjpg/video.mjpg -vf "setpts=1*PTS" video_file.avi

  But result was still the same. Recording time was way more than video duration. How can I add presentational time stamps when recording from mjpeg source using ffmpeg ?

• cmdutils : allow -h filter= to print information about a filter.

  28 mars 2013, par Anton Khirnov

  cmdutils : allow -h filter= to print information about a filter.