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• Will ffmpeg transcoding change the media's duration ?

  6 juillet 2012, par MaiTiano

  For example, I have a example flv media : 1775818137_1775828481_10344.flv. Only audio data has contained in it. (No video data)

  The major properties of this flv are :

  _____________________________________________________________________
  
  Format                                   : Flash Video
  
  
  
  File size                                : 87.4 KiB
  
  
  
  Duration                                 : 494 hours
  
  
  
  Overall bit rate mode                    : CBR
  
  
  
  Overall bit rate                         : 0 bps
  
  
  
  Writing application                      : Lavf53.4.0
  
  
  
  Audio
  
  
  
  Format                                   : MPEG Audio
  
  
  
  Format version                           : Version 1
  
  
  
  Format profile                           : Layer 3
  
  
  
  Mode                                     : Joint stereo
  
  
  
  Mode extension                           : MS Stereo
  
  
  
  Codec ID                                 : 2
  
  
  
  Codec ID/Hint                            : MP3
  
  
  
  Duration                                 : 49hours
  
  
  
  Bit rate mode                            : CBR
  
  
  
  Bit rate                                 : 64.0 Kbps
  
  
  
  Channel(s)                               : 2 channels
  
  
  
  Sampling rate                            : 44.1 KHz
  
  
  
  Compression mode                         : Lossy
  
  
  
  Stream size                              : 13.3 GiB
  
  
  
  _____________________________________________________________________

  Because this is the flv piece generated from the Suse10.0 server, the timestamp may be not correctly wrote into the flv metadata. Therefore, the Duration item listed above is not the real time of it.
  I has record the time in its file name.
  So, the beginning time is 1775818137 ms
  the ending time of this flv is 1775828481 ms
  The actual duation of this flv is 10344 ms which is about 10 seconds.

  **HERE IS MY QUESTION -.- **

  When I use ffmpeg to transcode flv fromat into ts format, like this,

  ./ffmpeg -i 1775818137_1775828481_10344.flv -f mpegts -vn -acodec libfaac -ar 44100 -ab 48k 1775818137_1775828481_10344.ts

  Is there possibility that the duration of final gotten ts file is not equal to the duation of original flv file ? In other words, the ts file's duration is not 10344ms.

• Concatenation error : Cannot concatenate media using NReco Video Converter for .NET (C#)

  10 septembre 2016, par rocketmail

  I want to concatenate two videos into one using Video Converter for .NET (C#) FFMpeg wrapper
  but I have got "cannot concatenate media" exception.. am i missing something or not..
  Here is my Source Code :

   var ffMpeg = new NReco.VideoConverter.FFMpegConverter();
  
      NReco.VideoConverter.ConcatSettings set = new NReco.VideoConverter.ConcatSettings();
  
  
  
      string videoRootPath = @"E:\Sam\Recording Feature\WebApplication2\WebApplication2\Video\";
  
      string tobename = "test";
  
  
  
      string[] _fileNames = { @"E:\Sam\Recording Feature\WebApplication2\WebApplication2\Video\1.mov",
  
                                          @"E:\Sam\Recording Feature\WebApplication2\WebApplication2\Video\2.mov"};
  
  
  
      ffMpeg.ConcatMedia(_fileNames, videoRootPath + tobename + ".mov", NReco.VideoConverter.Format.mov, set);

  Please Help

• Error while adding RTSP stream to Ant media server

  28 juillet 2021, par Jacob

  I have successfully remotely viewed the stream using ffplay -rtsp_transport tcp rtsp ://streamurl.

  


      ffplay version 4.4 Copyright (c) 2003-2021 the FFmpeg developers
  built with Apple clang version 12.0.5 (clang-1205.0.22.9)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/4.4_2 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-avresample --enable-videotoolbox
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, rtsp, from 'rtsp://admin:lyne1234@74.65.209.152:554/11/stream1':
  Metadata:
    title           : 10
  Duration: N/A, start: 0.050000, bitrate: N/A
  Stream #0:0: Video: hevc (Main), yuvj420p(pc, bt709), 1920x1080, 20 fps, 20 tbr, 90k tbn, 20 tbc
[swscaler @ 0x160330000] deprecated pixel format used, make sure you did set range correctly
   5.69 M-V:  0.014 fd=   0 aq=    0KB vq=   97KB sq=    0B f=0/0   


  


  However, when playing the stream the a VCL player or trying to add the stream to my AWS instance of Ant media server. The stream does not go through. On ant media server there is no errors the stream connects but its just a black screen. On the VCL player I am getting the error :

  


  VLC is unable to open the MRL 'rtsp://{streamurl}'


  


  I currently have an identical camera setup the exact same way working fine. The only difference is there on different LAN's with different ISP's.