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• Qt C++ ffmpeg cannot find library

  7 juin 2013, par Carnifrex

  I use Qt 5.0.2 with Mingw 4.7 on windows.

  I'm working on a c++ program and i'm trying to get the duration of video files. I found ffmpeg. Now i tried to compile a simple program but I think it fails with the libraries. I've tried to include both the shared and dev but they both will fail. ( Zeranoe FFmpeg builds)

  This is my pro file :

  TEMPLATE = app
  
  CONFIG += console
  
  CONFIG -= app_bundle
  
  CONFIG -= qt
  
  
  
  SOURCES += main.cpp
  
  
  
  INCLUDEPATH += C:\programming\ffmpeg-20130606-git--win32-shared\bin
  
  
  
  LIBS += -LC:\programming\ffmpeg-20130606-git--win32-shared\bin -lavcodec-55.dll -     lavformat-55.dll -lavutil-52.dll

  i get errors like :

  " :-1 : error : cannot find -lavcodec-55.dll"

  " :-1 : error : cannot find -lavformat-55.dll"

  I've also tried :

  INCLUDEPATH += C:\programming\ffmpeg-20130606-git--win32-dev\include
  
  INCLUDEPATH += C:\programming\ffmpeg-20130606-git--win32-dev\lib
  
  
  
  LIBS += -LC:\programming\ffmpeg-20130606-git--win32-dev\lib -lavcodec -lavformat -lavutil
  
  
  
  LIBS += -LC:\programming\ffmpeg-20130606-git--win32-dev\lib -llibavcodec.dll.a -llibavformat.dll.a -llibavutil.dll.a

  Here it gives a error "During startup program exited with code 0x0000135'

  I even tried to include each library individually. But no results..

  This is my main file :

  #include <iostream>
  
  using namespace std;
  
  extern "C" {
  
    #include <libavcodec></libavcodec>avcodec.h>    // required headers
  
    #include <libavformat></libavformat>avformat.h>
  
  }
  
  int main(int argc, char**argv) {
  
     av_register_all();             // offending library call
  
     return 0;
  
  }
  
  </iostream>

  A program simple as this will have 2 outcomes :

  1. the program runs but crashes if i call 'av_register_all()'
  2. It just tells me he cannot find the libraries.

  Can someone tell me what it is i'm doing wrong ? Or even give me a hint ? I can't really find a lot of good documentation on this one.

  Thanks in advance !

• How to install dylib files on mac ?

  1er mars 2019, par Pan

  I am trying to write a cross-platform program. This program uses libavcodec from ffmpeg to decode audio files. I downloaded the shared build from Zeranoe. Then I copied the .dylib files into /usr/local/lib. However the linker repeatedly says : library not found for -lavcodec. I am sure I added the option -L/usr/local/lib.

  What is the proper way to install these dylib files ?

• Problems with using on user computers without ffmeg

  8 janvier 2021, par DevilPD

  My Python program uses ffmpeg. However, if ffmeg was installed on your computer at the time of deployment and is not configured or does not exist in a directory such as the exe file, it will not work normally. If my program has to use ffmpeg while running, I would like to use it in the same folder in the library folder. What should I do ?

  


    try:
        for i in sp_text:
            try:
                output_dir = os.path.join('./', '%(playlist_title)s', '%(playlist_index)s. %(title)s.%(ext)s')

                download_list = [
                    i,
                ]

                ydl_opt = {
                    'outtmpl': output_dir,
                    'format': 'bestaudio/best',
                    'postprocessors': [{
                        'key': 'FFmpegExtractAudio',
                        'preferredcodec': 'mp3',
                        'preferredquality': '192',
                    }, {'key': 'FFmpegMetadata'}, ],
                }

                with youtube_dl.YoutubeDL(ydl_opt) as ydl:
                    ydl.download(download_list)

                self.lbl.setText('Success!')
            except:
                self.lbl.setText('Error1')
    except:
        self.lbl.setText('Error2')