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• Libavcodec "the procedure entry point for av_frame_alloc could not be located" error in Visual Studio 2017 C++ project

  25 novembre 2019, par Aves

  I am trying to use libavcodec from ffmpeg library in C++ with Visual Studio 2017 Community. I downloaded the latest x64 dev and shared builds from zeranoe (version 20171217), set up include directories and additional libraries in Visual Studio for x64 build, added DLL files from shared package to my PATH.

  This is my sample test code :

  extern "C" {
  
  #include 
  
  }
  
  int main() {
  
      avcodec_register_all();
  
      AVFrame *pAvFrame = av_frame_alloc();
  
      av_frame_free(&pAvFrame);
  
      return 0;
  
  }

  The code compiles without problems but when I run the application I see a dialogue window with error message "the procedure entry point for av_frame_alloc could not be located in DLL" (actual message is not in English, this is the translated version).

  I tried to set Linker->Optimization->References to /OPT:NOREF as it was advised in the similar questions but it did not help.

  Dependency walker shows that av_frame_alloc is exported, "Entry Point" is not bound. A little bit strange is that av_frame_alloc is displayed in both avcodec-58.dll (as red) and avutil-56.dll (as green). Maybe the reason is that the application is trying to get this function from avcodec instead of avutil, but I’m not sure, since I did not check the source code of these libraries.

  So the question is how to set up such a simple FFMPEG-based C++ project in VS2017, where I’m wrong ?

  UPD. 1.

  Linker flags : /OUT :"C :\work\code\TestFfmpeg\x64\Release\TestFfmpeg.exe" /MANIFEST /NXCOMPAT /PDB :"C :\work\code\TestFfmpeg\x64\Release\TestFfmpeg.pdb" /DYNAMICBASE "c :\work\dev\ffmpeg-20171217-387ee1d-win64-dev\lib*.lib" "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib" /DEBUG:FULL /MACHINE:X64 /OPT:NOREF /PGD :"C :\work\code\TestFfmpeg\x64\Release\TestFfmpeg.pgd" /MANIFESTUAC :"level=’asInvoker’ uiAccess=’false’" /ManifestFile :"x64\Release\TestFfmpeg.exe.intermediate.manifest" /OPT:ICF /ERRORREPORT:PROMPT /NOLOGO /TLBID:1

• "Non-monotonous DTS" and jerky video when copying streams

  2 décembre 2017, par forthrin

  I’m switching containers from MKV to mp4 for a set of video files. This has worked for all videos before, but now I’m getting weird problems (also when converting from MKV to another MKV !)

  1. I’m getting a million Non-monotonous DTS in output stream messages
  2. With QuickTime on macOS the video is jerking back and forth very fast while playing
  3. With VLC on macOS, the video is skipping a lot of frames

  How can I fix this, without re-encoding the video stream ? (Re-encoding audio would be acceptable.) Somehow it must be possible since the original MKV works perfectly !

  $ ffmpeg -i in.mkv -codec copy out.mp4
  
  ffmpeg version 3.3.4 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with Apple LLVM version 9.0.0 (clang-900.0.37)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.3.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-libass --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma --enable-vda
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libavresample   3.  5.  0 /  3.  5.  0
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  Input #0, matroska,webm, from 'in.mkv':
  
    Metadata:
  
      ENCODER         : Lavf54.63.104
  
    Duration: 00:37:59.98, start: 0.200000, bitrate: 2536 kb/s
  
      Stream #0:0: Video: h264 (High), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc
  
      Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s (default)
  
  [mp4 @ 0x7f93c9006c00] track 1: codec frame size is not set
  
  Output #0, mp4, to 'out.mp4':
  
    Metadata:
  
      encoder         : Lavf57.71.100
  
      Stream #0:0: Video: h264 (High) ([33][0][0][0] / 0x0021), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 23.98 fps, 23.98 tbr, 16k tbn, 1k tbc
  
      Stream #0:1(eng): Audio: ac3 ([165][0][0][0] / 0x00A5), 48000 Hz, 5.1(side), fltp, 384 kb/s (default)
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 0x7f93c9006c00] Non-monotonous DTS in output stream 0:0; previous: 60720, current: 60064; changing to 60721. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x7f93c9006c00] Non-monotonous DTS in output stream 0:0; previous: 63392, current: 62736; changing to 63393. This may result in incorrect timestamps in the output file.
  
  (...repeats a million times...)

  MP4Box :

  $ MP4Box -add in.mkv out.mp4
  
  [MPEG-2 TS] TS Packet 1 is scrambled - not supported
  
  [MPEG-2 TS] TS Packet 3 does not start with sync marker
  
  ...
  
  [MPEG-2 TS] TS Packet 999 does not start with sync marker
  
  [Importer] Unknown input file type
  
  Error importing in.mkv: Corrupted Data in file/stream

  So the file is maybe corrupt ? (Though it plays perfectly to begin with, in VLC at least !) Is there any way I can repair it and convert it to an mp4 file, again without re-encoding the video stream ?

• install ffmpeg on debian gives "unmet dependencies"

  1er juin 2017, par yarek

  I was trying to upgrade my FFMPEG.
  Now when I run :

  apt-get install ffmpeg

  The following packages have unmet dependencies:
  
       ffmpeg : Depends: libavcodec57 (>= 10:3.3.1) but it is not going to be installed
  
                Depends: libavdevice57 (>= 10:3.3.1) but it is not going to be installed
  
                Depends: libavfilter6 (>= 10:3.3.1) but it is not going to be installed
  
                Depends: libavformat57 (>= 10:3.3.1) but it is not going to be installed
  
                Depends: libavresample3 (>= 10:3.3.1) but it is not going to be installed
  
                Depends: libavutil55 (>= 10:3.3.1) but it is not going to be installed
  
                Depends: libc6 (>= 2.14) but 2.13-38+deb7u11 is to be installed
  
                Depends: libpostproc54 (>= 10:3.3.1) but it is not going to be installed
  
                Depends: libsdl2-2.0-0 (>= 2.0.4) but it is not going to be installed
  
                Depends: libswresample2 (>= 10:3.3.1) but it is not going to be installed
  
                Depends: libswscale4 (>= 10:3.3.1) but it is not going to be installed
  
       x264 : Depends: libavutil55 (>= 10:3.3.1) but it is not going to be installed
  
              Depends: libc6 (>= 2.14) but 2.13-38+deb7u11 is to be installed
  
              Depends: libffms2-4 (>= 1:2.23) but it is not going to be installed
  
              Depends: libswscale4 (>= 10:3.3.1) but it is not going to be installed
  
              Depends: libx264-150 but it is not going to be installed
  
      E: Unable to correct problems, you have held broken packages.