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• Undeclared error when compiling ffmpeg3.4.2 on my PC (win10 64bit)

  2 avril 2018, par Colin0114

  I try to compile ffmpeg 3.4.2 ( source code was git clone from repository of the latest version) on my PC of win10 ( 64bit )

  Here is my compiling steps :
  (1) install MinGW, https://sourceforge.net/projects/mingw/files/latest/download?source=files
  Installation location : c :/MinGW
  I added ’call "location/vcvars64.bat" ’ in ’msys.bat’
  (2) install yasm ( win64.exe ), http://yasm.tortall.net/Download.html
  Copy it to folder ’c :/windows/system32’
  (3) then ’git clone https://github.com/FFmpeg/FFmpeg.git’ in Git Bash
  (4) cd to ffmpeg, run ’./configure —disable-static —enable-shared -arch=x86_64’

  It spit a WARNING : ’pkg-config not found, library detection may fail’
  And I ignored it, and go on running ’make’, but failed ;

  ERROR messages in the following :
  ./compat/w32pthreads.h:122:9 : error : unknown type name ’INIT_ONCE’
  typedef INIT_ONCE pthread_once_t ;
  ./compat/w32pthreads.h:131:5 : error : implicit declaration of function ’InitOnceComplete’
  libavdevice/alldevices.c : At top level :
  ./compat/w32pthreads.h:123:27 : error : ’INIT_ONCE_STATIC_INIT’ undeclared here (not in a function) #define PTHREAD_ONCE_INIT INIT_ONCE_STATIC_INIT
  ^
  ./libavutil/thread.h:145:22 : note : in expansion of macro ’PTHREAD_ONCE_INIT’
  #define AV_ONCE_INIT PTHREAD_ONCE_INIT
  ^ 
  libavdevice/alldevices.c:92:37 : note : in expansion of macro ’AV_ONCE_INIT’
  static AVOnce av_device_next_init = AV_ONCE_INIT ;

• It is possible to record and at the same

  29 avril 2022, par mylos

  ffmpeg -i cam.mkv -c copy 1.ts


  


  It is possible to record and at the same time to delete to have a lead 4s ??
as to see it in vlc
Sorry for my poor English

  


• The duration information of the extracted truehd audio stream is lost when demux m2ts file with ffmpeg

  23 novembre 2019, par Bo Wang

  I would like to extract an truehd audio stream from m2ts files of a blu-ray with ffmpeg. All these m2ts files actually have 7 audio streams, which can be detected by eac3to :

  M2TS, 1 video track, 7 audio tracks, 5 subtitle tracks, 1:40:03
  
  1: Chapters, 34 chapters
  
  2: h265/HEVC, 2160p24 /1.001 (16:9), 10 bits
  
  3: TrueHD/AC3 (Atmos), English, 7.1 channels, 48kHz, dialnorm: -28dB
  
     (embedded: AC3, 5.1 channels, 640kbps, 48kHz, dialnorm: -27dB)
  
  4: E-AC3, English, 7.1 channels, 1024kbps, 48kHz, dialnorm: -28dB
  
     (core: AC3, 5.1 channels, 576kbps, 48kHz, dialnorm: -28dB)
  
  5: AC3, English, 5.1 channels, 640kbps, 48kHz, dialnorm: -27dB
  
  6: AC3, English, 2.0 channels, 320kbps, 48kHz, dialnorm: -27dB
  
  7: AC3, English, 2.0 channels, 320kbps, 48kHz, dialnorm: -27dB
  
  8: AC3, Chinese, 2.0 channels, 448kbps, 48kHz
  
  9: AC3, Chinese, 5.1 channels, 384kbps, 48kHz, 300ms
  
  10: Subtitle (PGS), English
  
  11: Subtitle (PGS), Chinese
  
  12: Subtitle (PGS), Chinese
  
  13: Subtitle (PGS), Chinese
  
  14: Subtitle (PGS), Chinese

  When I use ffmpeg to do the demux work for every m2ts, problem arises.
  By runningffmpeg.exe -hide_banner -i "F:\xxx\BDMV\STREAM\00055.m2ts" -map 0:1 01.thd, an file 01.thd is obtained. However, by running ffprobe 01.thd, it is shown that this file is with fault as its duration information is absent :

  Input #0, truehd, from '0x1100-00055.thd':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Audio: truehd, 48000 Hz, 7.1, s32 (24 bit)

  If I run ffmpeg.exe -hide_banner -i "F:\xxx\BDMV\STREAM\00055.m2ts", it can be found that ffmpeg shows an additional audio stream as it recognizes the embedded 5.1 AC3 stream inside the 7.1 TrueHD audio stream, as independent :

  Input #0, mpegts, from 'F:\xxx\BDMV\STREAM\00055.m2ts':
  
    Duration: 00:00:48.62, start: 4198.333333, bitrate: 50005 kb/s
  
    Program 1
  
      Stream #0:0[0x1011]: Video: hevc (Main 10) (HDMV / 0x564D4448), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x2160 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, 23.98 tbc
  
      Stream #0:1[0x1100]: Audio: truehd (AC-3 / 0x332D4341), 48000 Hz, 7.1, s32 (24 bit)
  
      Stream #0:2[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 640 kb/s
  
      Stream #0:3[0x1101]: Audio: eac3 (AC-3 / 0x332D4341), 48000 Hz, 7.1, fltp, 1024 kb/s
  
      Stream #0:4[0x1102]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 640 kb/s
  
      Stream #0:5[0x1103]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 320 kb/s
  
      Stream #0:6[0x1104]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 320 kb/s
  
      Stream #0:7[0x1105]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 448 kb/s
  
      Stream #0:8[0x1106]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 384 kb/s
  
      Stream #0:9[0x12a0]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
  
      Stream #0:10[0x12a1]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
  
      Stream #0:11[0x12a2]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
  
      Stream #0:12[0x12a3]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
  
      Stream #0:13[0x12a4]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)

  How can I make ffmpeg generate correct .thd file with duration information for the stream 0:1 ?
  And if possible, how can I make ffmpeg keep the embedded 5.1 core stream as well (test result shows that this core stream is stripped out) ?