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• "Non-monotonous DTS in output stream" every 13 hours 14 minutes

  29 mars 2018, par Gnitry

  I have a problem with the latest ffmpeg from zeranoe.
  Every 13h14m ffmpeg stops recording.

  ffmpeg started on 2017-09-28 at 10:36:49
  
  Report written to "ffmpeg-20170928-103649.log"
  
  Command line:
  
  "D:\\ffmpeg\\ffmpeg.exe" -report
  
  ffmpeg version N-87353-g183fd30 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 76.100 / 55. 76.100
  
    libavcodec     57.106.101 / 57.106.101
  
    libavformat    57. 82.101 / 57. 82.101
  
    libavdevice    57.  8.101 / 57.  8.101
  
    libavfilter     6.105.100 /  6.105.100
  
    libswscale      4.  7.103 /  4.  7.103
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  Splitting the commandline.
  
  Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option report (generate a report) with argument 1.
  
  Successfully parsed a group of options.
  
  Hyper fast Audio and Video encoder

  I record video streams from 3 cameras.

  Stream 1 :

  Input #0, rtp, from 'rtp://225.1.1.1:1024':
  
    Duration: N/A, start: 60424.501000, bitrate: N/A
  
    Program 1
  
      Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(progressiv
  
  e), 1920x1080 [SAR 1:1 DAR 16:9], 50 fps, 50 tbr, 90k tbn, 100 tbc
  
      Stream #0:1(eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, mono,
  
  fltp, 164 kb/s

  Streams 2,3 :

  Input #0, rtsp, from 'rtsp://192.168.3.36:554/stream1':
  
    Metadata:
  
      title           : Session streamed by "Pelco Streaming Server"
  
      comment         : stream1
  
    Duration: N/A, start: 0.219167, bitrate: N/A
  
      Stream #0:0: Video: h264 (Baseline), yuv420p(progressive), 640x480, 25 fps,
  
  25 tbr, 90k tbn, 50 tbc

  I record each of them with segmentation every 1 minute using separated ffmpeg instances like :

  ffmpeg -i "rtsp://192.168.3.36:554/stream1" -vcodec copy -an -f segment -strftime 1 -segment_time 60 "novus-%Y-%m-%d_%H-%M-%S.ts"

  Every 13 hours 14 minutes (from beginning of recording) each ffmpeg stops recording with messages like "Non-monotonous DTS in output stream 0:0". And it doesn’t matter when I started every ffmpeg intance : if I started instance №2 1 minute later that instance №1, it will stop recording in 1 minute after №1 accordingly. I tried it on two PC : Windows Server 2012 x64 and Windows 10 x64.

  ...
  
  [NULL @ 000000000034a900] SEI type 5 size 408 truncated at 160
  
  [segment @ 000000000034e780] stream:0 start_pts_time:47640.5 pts:4289549528 pts_time:47661.7 dts:4289549528 dts_time:47661.7 -> pts:4289549528 pts_time:47661.7 dts:4289549528 dts_time:47661.7
  
  [NULL @ 000000000034a900] SEI type 5 size 408 truncated at 160
  
  [segment @ 000000000034e780] stream:0 start_pts_time:47640.5 pts:4289553131 pts_time:47661.7 dts:4289553131 dts_time:47661.7 -> pts:4289553131 pts_time:47661.7 dts:4289553131 dts_time:47661.7
  
  [NULL @ 000000000034a900] SEI type 5 size 408 truncated at 160
  
  [segment @ 000000000034e780] stream:0 start_pts_time:47640.5 pts:4289556734 pts_time:47661.7 dts:4289556734 dts_time:47661.7 -> pts:4289556734 pts_time:47661.7 dts:4289556734 dts_time:47661.7
  
  [NULL @ 000000000034a900] SEI type 5 size 336 truncated at 160
  
  [segment @ 000000000034e780] Non-monotonous DTS in output stream 0:0; previous: 4289535114, current: -5428580; changing to 4289535115. This may result in incorrect timestamps in the output file.
  
  [segment @ 000000000034e780] stream:0 start_pts_time:47640.5 pts:4289556735 pts_time:47661.7 dts:4289556735 dts_time:47661.7 -> pts:4289556735 pts_time:47661.7 dts:4289556735 dts_time:47661.7
  
  [NULL @ 000000000034a900] SEI type 5 size 408 truncated at 160
  
  [segment @ 000000000034e780] Non-monotonous DTS in output stream 0:0; previous: 4289535115, current: -5424977; changing to 4289535116. This may result in incorrect timestamps in the output file.
  
  [segment @ 000000000034e780] stream:0 start_pts_time:47640.5 pts:4289556736 pts_time:47661.7 dts:4289556736 dts_time:47661.7 -> pts:4289556736 pts_time:47661.7 dts:4289556736 dts_time:47661.7
  
  [NULL @ 000000000034a900] SEI type 5 size 408 truncated at 160
  
  [segment @ 000000000034e780] Non-monotonous DTS in output stream 0:0; previous: 4289535116, current: -5421374; changing to 4289535117. This may result in incorrect timestamps in the output file.
  
  [segment @ 000000000034e780] stream:0 start_pts_time:47640.5 pts:4289556737 pts_time:47661.7 dts:4289556737 dts_time:47661.7 -> pts:4289556737 pts_time:47661.7 dts:4289556737 dts_time:47661.7
  
  frame=1190370 fps= 25 q=-1.0 size=N/A time=13:14:21.50 bitrate=N/A speed=   1x    
  
  [NULL @ 000000000034a900] SEI type 5 size 408 truncated at 160
  
  [segment @ 000000000034e780] Non-monotonous DTS in output stream 0:0; previous: 4289535117, current: -5417772; changing to 4289535118. This may result in incorrect timestamps in the output file.
  
  ...

  The full debug log with this problem is here (25 Mb, zipped) :
  ​https://drive.google.com/file/d/0B1LIS8G55R7-OGY4QkdkQ0J1cVE/view?usp=sharing
  I can’t record video infinitely. Every 13 hours I have broken recording. I tried to record with "copytb 1", "genpts" but it doesn’t help. I don’t think it is the network problem, because I tried to record the same rtsp stream by two instances of ffmpeg with time shift of start : they stuck separately at separate time.
  Does anyone know how to solve it ? I can provide you with another information you need about this.

  Update : If I wait 13 hours after bug appeared, the recording starts again.

• "-y" option in ffmpeg can't overwrite exist file rightly

  11 janvier 2018, par Alexander_flyer

  I want to overwrite the exists .wav file automatically

  and I found a option from the document of the ffmpeg :

  -y (global)

  Overwrite output files without asking.

  and I have a test :

  ffmpeg -i 113.wav -ar 8000 -y 113.wav

  but what I got is a .wav file with only 1 second duration, It’s 2m30s duration before !
  before
  after

  If without the "-y" option, and type "y" after the command line reminder, all is Ok

  File '113.wav' already exists. Overwrite ? [y/N] y

  I’m really confused, and waiting for your response.

  THX

• FFMPEG output duration using "-t" is too long by 10 ms

  9 octobre 2018, par Ze'ev

  I’m using this command to take video from a 35 second QuickTime file and replace audio with a WAV :

  ffmpeg -i 'video.mov' -i 'audio.wav' -c:v copy -c:a copy -map 0:v:0 -map 1:a:0 -t 35.0000 'output.mov'

  But the audio is slightly longer than the video, and I’m trying to make ffmpeg trim the output to exactly 35 seconds with -t 35 but the output is 35.01 seconds.

  I also tried -t 35.000 and -to 35 and several other options, but it’s alway 10ms too long.

  ffmpeg output :

  ffmpeg version N-91789-g11cec34829 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with Apple LLVM version 9.1.0 (clang-902.0.39.2)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-appkit --enable-avfoundation --enable-coreimage --enable-audiotoolbox
  
    libavutil      56. 19.100 / 56. 19.100
  
    libavcodec     58. 27.101 / 58. 27.101
  
    libavformat    58. 17.106 / 58. 17.106
  
    libavdevice    58.  4.101 / 58.  4.101
  
    libavfilter     7. 26.100 /  7. 26.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
    libpostproc    55.  2.100 / 55.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      creation_time   : 2018-10-09T13:41:49.000000Z
  
    Duration: 00:00:35.00, start: 0.000000, bitrate: 172467 kb/s
  
      Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le(tv, bt709, progressive), 1920x1080, 170692 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 25 tbc (default)
  
      Metadata:
  
        creation_time   : 2018-10-09T13:41:49.000000Z
  
        handler_name    : Apple Video Media Handler
  
        encoder         : Apple ProRes 422 (HQ)
  
        timecode        : 00:01:12:22
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s (default)
  
      Metadata:
  
        creation_time   : 2018-10-09T13:41:49.000000Z
  
        handler_name    : Apple Sound Media Handler
  
        timecode        : 00:01:12:22
  
      Stream #0:2(eng): Data: none (tmcd / 0x64636D74) (default)
  
      Metadata:
  
        creation_time   : 2018-10-09T13:41:49.000000Z
  
        handler_name    : Time Code Media Handler
  
        timecode        : 00:01:12:22
  
  Guessed Channel Layout for Input Stream #1.0 : stereo
  
  Input #1, wav, from 'audio.wav':
  
    Metadata:
  
      encoded_by      : Pro Tools
  
      originator_reference: aaygKpJ1bvMk
  
      date            : 2018-10-02
  
      creation_time   : 12:29:34
  
      time_reference  : 172800000
  
    Duration: 00:00:35.04, bitrate: 2316 kb/s
  
      Stream #1:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s
  
  Output #0, mov, to 'output.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      encoder         : Lavf58.17.106
  
      Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 170692 kb/s, 0.04 fps, 25 tbr, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        creation_time   : 2018-10-09T13:41:49.000000Z
  
        handler_name    : Apple Video Media Handler
  
        encoder         : Apple ProRes 422 (HQ)
  
        timecode        : 00:01:12:22
  
      Stream #0:1: Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #1:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=  875 fps=479 q=-1.0 Lsize=  739138kB time=00:00:34.99 bitrate=173024.6kbits/s speed=19.2x    
  
  video:729276kB audio:9846kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.002153%