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• c FFmpeg undefined refference error [duplicate]

  14 août 2017, par galagala

  This question already has an answer here :

  • What is an undefined reference/unresolved external symbol error and how do I fix it ?
    
    28 answers
    

  I want to write my own video player, so I am trying to use FFmpeg with C.
  I am using Ubuntu 16.04.3 LTS and compile FFmpeg following this tutorial https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu

  after that I did add libavcodec.a to linker setting list and the source code path to search directory (using codeblocks)

  but my code still get error : undefined refference to "avcodec_register_all()"

  #include 
  
  #include "libavcodec/avcodec.h"
  
  int main()
  
  {
  
      avcodec_register_all();
  
      return 0;
  
  }

  after that, I search the libavcodec folder
  I did find avcodec.h and void avcodec_register_all(void) defined in it
  but I couldn’t find avcodec.c in the folder

  Is that normal ? and is that the reason why I got undefined reference error ?
  how to fix it ?

• AVI to MP4 - ffmpeg conversion

  4 juin 2014, par Emmanuel Brunet

  I’m running a debian 7.5 machine with ffmpeg-2.2 installed following these instructions

  Issue

  I’m trying to display a mp4 video inside my browser. The original file has an AVI container format. I can successfully convert it to mp4 and the targetfile is readable (video + sound) with the totem movie player. So I thought everything would be OK displaying the bellow page

  HTML5 web page

      
  
  
  
  
  
  <video width="640" height="480" controls="controls">
  
    <source src="/path/to/output.mp4" type="video/mp4">
  
  <h3>Your browser does not support the video tag</h3>
  
  </source></video>

  Input probe

  $ ffprobe -show_streams input.avi
  
  
  
    Duration: 00:08:22.90, start: 0.000000, bitrate: 1943 kb/s
  
      Stream #0:0: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 64 kb/s
  
      Stream #0:1: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x540 [SAR 1:1 DAR 4:3], 1870 kb/s, 29.97 fps, 25 tbr, 29.97 tbn, 25 tbc

  Convert

  $ ffmpeg -y -fflags +genpts -i input.avi -acodec copy -vcodec copy ouput.mp4

  Html browser

  Opening the above html file plays sound but no video is displayed.

  When I use other .mp4 files, videos succesfully displayed so I’m sure I face a conversion issue.

  Not : I’ve tryed a lot of other ffmpeg options but without success.

  Any idea ?

  Thanks in advance.

• Ffmpeg ./configure not found

  7 juin 2016, par Justin Tullock

  I’m trying to install ffmpeg with libvpx & libx264 on my vps. Centos07. I’ve followed these instructions https://trac.ffmpeg.org/wiki/CompilationGuide/Centos to the T.

  Now when I try to run

  cd ~/ffmpeg; ./configure --enable-libvpx --enable-gpl --enable-libx264

  it returns

  -bash: ./configure: No such file or directory

  When I try ffmpeg -v

  ffmpeg: error while loading shared libraries: libx264.so.148: cannot open shared object file: No such file or directory

  and ldd $(which ffmpeg) returns

  root@host [~/ffmpeg_sources]# ldd $(which ffmpeg)
  
  linux-vdso.so.1 =>  (0x00007fff4fb86000)
  
  libxcb.so.1 => /lib64/libxcb.so.1 (0x00007f4972e27000)
  
  libxcb-shm.so.0 => /lib64/libxcb-shm.so.0 (0x00007f4972c23000)
  
  libxcb-xfixes.so.0 => /lib64/libxcb-xfixes.so.0 (0x00007f4972a1a000)
  
  libxcb-shape.so.0 => /lib64/libxcb-shape.so.0 (0x00007f4972816000)
  
  libx264.so.148 => not found
  
  libm.so.6 => /lib64/libm.so.6 (0x00007f4972513000)
  
  liblzma.so.5 => /lib64/liblzma.so.5 (0x00007f49722ee000)
  
  libbz2.so.1 => /lib64/libbz2.so.1 (0x00007f49720de000)
  
  libz.so.1 => /lib64/libz.so.1 (0x00007f4971ec7000)
  
  libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f4971cab000)
  
  libc.so.6 => /lib64/libc.so.6 (0x00007f49718e9000)
  
  libXau.so.6 => /lib64/libXau.so.6 (0x00007f49716e4000)
  
  /lib64/ld-linux-x86-64.so.2 (0x00007f4973056000)

  I’ve followed all the instructions exactly - is there something I’m missing ?