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• How do I fix "undefined reference" errors in my Qt-Creator project while linking the ffmpeg library "libav" ?

  25 décembre 2022, par VCoder12345

  I'm currently trying to use the libav library from FFmpeg in my Qt-Creator project, but I get over a thousand "undefined reference to ..." errors and I have no idea what I'm doing wrong. The errors don't depend on the actual code, because I changed it a few times, but as long as I use methods of the library these errors occur.
I have also tried to run the code in Visual Studio and that worked.

  


  My project-file looks like this :

  


  QT -= gui

CONFIG += c++11 console
CONFIG -= app_bundle

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
INCLUDEPATH += D:\Programme\ffmpeg-source\ffmpeg-5.1.2\vs2019_build\include

SOURCES += \
    Main.cpp

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

QMAKE_CXXFLAGS += -D__STDC_CONSTANT_MACROS

LIBS += -lMfuuid
LIBS += -lStrmiids
LIBS += -lMfplat
LIBS += -lBcrypt
LIBS += -lSecur32
LIBS += -lWs2_32
LIBS += -pthread
LIBS += -L"D:\Programme\ffmpeg-source\ffmpeg-5.1.2\vs2019_build\lib"
LIBS += -lavdevice
LIBS += -lavfilter
LIBS += -lavformat
LIBS += -lavcodec
LIBS += -lswresample
LIBS += -lswscale
LIBS += -lavutil

HEADERS += \
    wrapper.h


  


  The library files are stored at D :\Programme\ffmpeg-source\ffmpeg-5.1.2\vs2019_build\lib. The errors I get when running the program look something like this (extract).

  


  :-1: Fehler: D:\Programme\ffmpeg-source\ffmpeg-5.1.2\vs2019_build\lib/libavformat.a(libavformat/aviobuf.o):(.text$mn+0x16): undefined reference to `__security_cookie'
:-1: Fehler: D:\Programme\ffmpeg-source\ffmpeg-5.1.2\vs2019_build\lib/libavformat.a(libavformat/aviobuf.o):(.xdata[$unwind$ff_read_string_to_bprint_overwrite]+0x1c): more undefined references to `__GSHandlerCheck' follow
:-1: Fehler: D:\Programme\ffmpeg-source\ffmpeg-5.1.2\vs2019_build\lib/libavformat.a(libavformat/4xm.o):(.text$mn+0x250): undefined reference to `__security_check_cookie'
:-1: Fehler: D:\Programme\ffmpeg-source\ffmpeg-5.1.2\vs2019_build\lib/libavformat.a(libavformat/yuv4mpegdec.o):(.text$mn+0x2fe): undefined reference to `sscanf'
:-1: Fehler: D:\Programme\ffmpeg-source\ffmpeg-5.1.2\vs2019_build\lib/libavformat.a(libavformat/yuv4mpegdec.o):(.text$mn+0x33f): undefined reference to `sscanf'
:-1: Fehler: D:\Programme\ffmpeg-source\ffmpeg-5.1.2\vs2019_build\lib/libavformat.a(libavformat/yuv4mpegdec.o):(.text$mn+0x65b): undefined reference to `__report_rangecheckfailure'
:-1: Fehler: D:\Programme\ffmpeg-source\ffmpeg-5.1.2\vs2019_build\lib/libavformat.a(libavformat/yuv4mpegdec.o):(.text$mn+0x18): undefined reference to `__security_cookie'
:-1: Fehler: D:\Programme\ffmpeg-source\ffmpeg-5.1.2\vs2019_build\lib/libavformat.a(libavformat/yuv4mpegdec.o):(.text$mn+0x97): undefined reference to `__security_check_cookie'
:-1: Fehler: D:\Programme\ffmpeg-source\ffmpeg-5.1.2\vs2019_build\lib/libavformat.a(libavformat/yuv4mpegdec.o):(.text$mn+0x14d): undefined reference to `__report_rangecheckfailure'
:-1: Fehler: D:\Programme\ffmpeg-source\ffmpeg-5.1.2\vs2019_build\lib/libavformat.a(libavformat/yuv4mpegdec.o):(.xdata[$unwind$yuv4_read_header]+0x20): undefined reference to `__GSHandlerCheck'
:-1: Fehler: D:\Programme\ffmpeg-source\ffmpeg-5.1.2\vs2019_build\lib/libavformat.a(libavformat/yuv4mpegdec.o):(.xdata[$unwind$yuv4_read_packet]+0x18): undefined reference to `__GSHandlerCheck'
:-1: Fehler: D:\Programme\ffmpeg-source\ffmpeg-5.1.2\vs2019_build\lib/libavformat.a(libavformat/xwma.o):(.text$mn+0x14): undefined reference to `__security_cookie'
:-1: Fehler: D:\Programme\ffmpeg-source\ffmpeg-5.1.2\vs2019_build\lib/libavformat.a(libavformat/xwma.o):(.text$mn+0x2e0): undefined reference to `__security_check_cookie'
...


  


  Is a library missing ? Am I including the lMfuuid, Strmiids, Mfplat, etc. the wrong way ? If you have any idea I would be very grateful. I'm really confused. I'm using the MinGW64 compiler.

  


• How to convert CODEC of all videos in a folder from "Codec : MPEG-H Part2/HEVC (H.265) (hev1)" to "Codec : H264 - MPEG-4 AVC (part 10) (avc1)" [closed]

  19 mai 2024, par user25123807

  I've downloaded shows and cant get them to play on TV as the codec is not supported. H264 is a compatible codec. I have noted the codec of the videos I currently have (H256), and the codec which is compatible (264). I need help converting in bulk, all videos in a folder to the compatible codec - H264 - MPEG-4 AVC (part 10) (avc1).

  


  please help

  


  i have ffmpeg.

  


  I have tried changing the file type from mkv —> mp4 but the issue is the codec. I need help bulk converting the codec (265—>264). All the videos I am trying to convert to 264 are .mp4 videos.

  


• FFmpeg "movflags" > "faststart" causes invalid MP4 file to be written

  22 août 2016, par williamtroup

  I’m setting up the format layout for the video as follows :

  AVOutputFormat* outputFormat = ffmpeg.av_guess_format(null, "output.mp4", null);
  
  
  
  AVCodec* videoCodec = ffmpeg.avcodec_find_encoder(outputFormat->video_codec);
  
  
  
  AVFormatContext* formatContext = ffmpeg.avformat_alloc_context();
  
  formatContext->oformat = outputFormat;
  
  formatContext->video_codec_id = videoCodec->id;
  
  
  
  ffmpeg.avformat_new_stream(formatContext, videoCodec);

  This is how I am setting up the Codec Context :

  AVCodecContext* codecContext = ffmpeg.avcodec_alloc_context3(videoCodec);
  
  codecContext->bit_rate = 400000;
  
  codecContext->width = 1280;
  
  codecContext->height = 720;
  
  codecContext->gop_size = 12;
  
  codecContext->max_b_frames = 1;
  
  codecContext->pix_fmt = videoCodec->pix_fmts[0];
  
  codecContext->codec_id = videoCodec->id;
  
  codecContext->codec_type = videoCodec->type;
  
  codecContext->time_base = new AVRational
  
  {
  
      num = 1,
  
      den = 30
  
  };

  I’m using the following code to setup the "movflags" > "faststart" option for the header of the video :

  AVDictionary* options = null;
  
  
  
  int result = ffmpeg.av_dict_set(&options, "movflags", "faststart", 0);
  
  
  
  int writeHeaderResult = ffmpeg.avformat_write_header(formatContext, &options);

  The file is opened and the header is written as follows :

  if ((formatContext->oformat->flags & ffmpeg.AVFMT_NOFILE) == 0)
  
  {
  
      int ioOptionResult = ffmpeg.avio_open(&formatContext->pb, "output.mp4", ffmpeg.AVIO_FLAG_WRITE);
  
  }
  
  
  
  int writeHeaderResult = ffmpeg.avformat_write_header(formatContext, &options);

  After this, I write each video frame as follows :

  outputFrame->pts = frameIndex;
  
  
  
  packet.flags |= ffmpeg.AV_PKT_FLAG_KEY;
  
  packet.pts = frameIndex;
  
  packet.dts = frameIndex;
  
  
  
  int encodedFrame = 0;
  
  int encodeVideoResult = ffmpeg.avcodec_encode_video2(codecContext, &packet, outputFrame, &encodedFrame);
  
  
  
  if (encodedFrame != 0)
  
  {
  
      packet.pts = ffmpeg.av_rescale_q(packet.pts, codecContext->time_base, m_videoStream->time_base);
  
      packet.dts = ffmpeg.av_rescale_q(packet.dts, codecContext->time_base, m_videoStream->time_base);
  
      packet.stream_index = m_videoStream->index;
  
  
  
      if (codecContext->coded_frame->key_frame > 0)
  
      {
  
          packet.flags |= ffmpeg.AV_PKT_FLAG_KEY;
  
      }
  
  
  
      int writeFrameResult = ffmpeg.av_interleaved_write_frame(formatContext, &packet);
  
  }

  After that, I write the trailer :

  int writeTrailerResult = ffmpeg.av_write_trailer(formatContext);

  The file finishes writing and everything closes and frees up correctly. However, the MP4 file is unplayable (even VLC cant play it). AtomicParsley.exe won’t show any information about the file either.

  The DLLs used for the AutoGen library are :

  avcodec-56.dll
  
  avdevice-56.dll
  
  avfilter-5.dll
  
  avformat-56.dll
  
  avutil-54.dll
  
  postproc-53.dll
  
  swresample-1.dll
  
  swscale-3.dll