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• VLC3 compilation error : linking issue with the libavutil library

  4 octobre 2017, par Ivan Kolesnikov

  I tried to compile VLC3 in ubuntu15.10 a long time, but still no luck.
  I configured FFmpeg as follow :
  

   /ffmpeg-3.3.3$ ./configure —cpu=native —enable-pthreads —enable-bzlib —enable-libdc1394 —enable-libfreetype —enable-frei0r —enable-gnutls —enable-libgsm —enable-libmp3lame —enable-librtmp —enable-libopencv —enable-libopenjpeg —enable-libopus —enable-libpulse —enable-libschroedinger —enable-libspeex —enable-libtheora —enable-vaapi —enable-vdpau —enable-libvorbis —enable-libvpx —enable-zlib —enable-libfdk-aac —enable-nonfree —enable-gpl —enable-swscale —enable-libcdio —enable-libxcb —enable-libx264 —enable-libxvid —enable-libopencore-amrnb —enable-version3 —enable-libopencore-amrwb —enable-libvo-amrwbenc —enable-nvenc —enable-openssl —enable-decklink —extra-cflags=-I/home/ivan/Downloads/Blackmagic_DeckLink_SDK_10.9.5/Linux/include —extra-ldflags=-ldl —extra-libs=-ldl —enable-pic

  And configured VLC3 wth the following parameters :

   /vlc-3.0.0-git$ ./configure
  —with-decklink-sdk=I/home/ivan/Downloads/Blackmagic_DeckLink_SDK_10.9.5/Linux/include —disable-chromecas

  The compilation looks fine. Then I tried :

  $ sudo make install

  And got the following error :
  

    CCLD     libavio_plugin.la
  
  /usr/local/lib/libavutil.a(hwcontext_vaapi.o): In function `vaapi_device_free':
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:899: undefined reference to `XCloseDisplay'
  
  /usr/local/lib/libavutil.a(hwcontext_vaapi.o): In function `vaapi_device_create':
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:929: undefined reference to `XOpenDisplay'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:934: undefined reference to `vaGetDisplay'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:941: undefined reference to `XDisplayName'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:931: undefined reference to `XDisplayName'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:958: undefined reference to `vaGetDisplayDRM'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:929: undefined reference to `XOpenDisplay'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:931: undefined reference to `XDisplayName'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:936: undefined reference to `XDisplayName'
  
  /usr/local/lib/libavutil.a(hwcontext_vdpau.o): In function `vdpau_device_create':
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vdpau.c:431: undefined reference to `XOpenDisplay'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vdpau.c:437: undefined reference to `XDisplayString'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vdpau.c:439: undefined reference to `XDefaultScreen'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vdpau.c:439: undefined reference to `vdp_device_create_x11'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vdpau.c:433: undefined reference to `XDisplayName'
  
  /usr/local/lib/libavutil.a(hwcontext_vdpau.o): In function `vdpau_device_free':
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vdpau.c:410: undefined reference to `XCloseDisplay'
  
  collect2: error: ld returned 1 exit status
  
  Makefile:12577: recipe for target 'libavio_plugin.la' failed
  
  make[4]: *** [libavio_plugin.la] Error 1
  
  make[4]: Leaving directory '/home/ivan/vlc-3.0.0-git/modules'
  
  Makefile:25280: recipe for target 'install-recursive' failed
  
  make[3]: *** [install-recursive] Error 1
  
  make[3]: Leaving directory '/home/ivan/vlc-3.0.0-git/modules'
  
  Makefile:25679: recipe for target 'install' failed
  
  make[2]: *** [install] Error 2
  
  make[2]: Leaving directory '/home/ivan/vlc-3.0.0-git/modules'
  
  Makefile:1519: recipe for target 'install-recursive' failed
  
  make[1]: *** [install-recursive] Error 1
  
  make[1]: Leaving directory '/home/ivan/vlc-3.0.0-git'
  
  Makefile:1985: recipe for target 'install' failed

  I already saw the following questions related this situation :
  question1,
  question2,
  question3

  As I understand from these questions, I should move to the end the following libraries in the compile command :

  -lvdpau -lX11 -lva*

  But I still didn’t understand where is the place to moving these libraries.
  Please see the output results of the pkg-config command :

  $ pkg-config —libs libavcodec libavformat libswscale libavutil

  -L/usr/local/lib -lavformat -lXv -lX11 -lXext -lstdc++ -lvdpau -lva -lva-x11 -lX11 -lva -lva-drm -lva -lxcb -lxcb-shm -lxcb -lxcb-xfixes -lxcb-render -lxcb-shape -lxcb -lxcb-shape -lxcb -lcdio_paranoia -lcdio_cdda -lcdio -ljack -lasound -ldc1394 -lssl -lcrypto -lxvidcore -lx264 -lvpx -lm -lvpx -lm -lvpx -lm -lvpx -lm -lvorbisenc -lvorbis -logg -lvo-amrwbenc -ltheoraenc -ltheoradec -logg -lspeex -lschroedinger-1.0 -lrtmp -lz -lgmp -lpulse -lopus -lopenjpeg -DOPJ_STATIC /usr/lib/x86_64-linux-gnu/libopencv_calib3d.so -lopencv_calib3d /usr/lib/x86_64-linux-gnu/libopencv_contrib.so -lopencv_contrib /usr/lib/x86_64-linux-gnu/libopencv_core.so -lopencv_core /usr/lib/x86_64-linux-gnu/libopencv_features2d.so -lopencv_features2d /usr/lib/x86_64-linux-gnu/libopencv_flann.so -lopencv_flann /usr/lib/x86_64-linux-gnu/libopencv_gpu.so -lopencv_gpu /usr/lib/x86_64-linux-gnu/libopencv_highgui.so -lopencv_highgui
  /usr/lib/x86_64-linux-gnu/libopencv_imgproc.so -lopencv_imgproc
  /usr/lib/x86_64-linux-gnu/libopencv_legacy.so -lopencv_legacy
  /usr/lib/x86_64-linux-gnu/libopencv_ml.so -lopencv_ml
  /usr/lib/x86_64-linux-gnu/libopencv_objdetect.so -lopencv_objdetect
  /usr/lib/x86_64-linux-gnu/libopencv_ocl.so -lopencv_ocl
  /usr/lib/x86_64-linux-gnu/libopencv_photo.so -lopencv_photo
  /usr/lib/x86_64-linux-gnu/libopencv_stitching.so -lopencv_stitching
  /usr/lib/x86_64-linux-gnu/libopencv_superres.so -lopencv_superres
  /usr/lib/x86_64-linux-gnu/libopencv_ts.so -lopencv_ts
  /usr/lib/x86_64-linux-gnu/libopencv_video.so -lopencv_video
  /usr/lib/x86_64-linux-gnu/libopencv_videostab.so -lopencv_videostab
  -lopencore-amrwb -lopencore-amrnb -lmp3lame -lgsm -lfreetype -lfdk-aac -lgnutls -lcrystalhd -lm -llzma -lbz2 -lz -pthread -ldl -lavcodec -lXv -lX11 -lXext -lstdc++ -lvdpau -lva -lva-x11 -lX11 -lva -lva-drm -lva -lxcb -lxcb-shm -lxcb -lxcb-xfixes -lxcb-render -lxcb-shape -lxcb -lxcb-shape -lxcb -lcdio_paranoia -lcdio_cdda -lcdio -ljack -lasound -ldc1394 -lssl -lcrypto -lxvidcore -lx264 -lvpx -lm -lvpx -lm -lvpx -lm -lvpx -lm -lvorbisenc -lvorbis -logg -lvo-amrwbenc -ltheoraenc -ltheoradec -logg -lspeex -lschroedinger-1.0 -lrtmp -lz -lgmp -lpulse -lopus -lopenjpeg -DOPJ_STATIC /usr/lib/x86_64-linux-gnu/libopencv_calib3d.so -lopencv_calib3d
  /usr/lib/x86_64-linux-gnu/libopencv_contrib.so -lopencv_contrib
  /usr/lib/x86_64-linux-gnu/libopencv_core.so -lopencv_core
  /usr/lib/x86_64-linux-gnu/libopencv_features2d.so -lopencv_features2d
  /usr/lib/x86_64-linux-gnu/libopencv_flann.so -lopencv_flann
  /usr/lib/x86_64-linux-gnu/libopencv_gpu.so -lopencv_gpu
  /usr/lib/x86_64-linux-gnu/libopencv_highgui.so -lopencv_highgui
  /usr/lib/x86_64-linux-gnu/libopencv_imgproc.so -lopencv_imgproc
  /usr/lib/x86_64-linux-gnu/libopencv_legacy.so -lopencv_legacy
  /usr/lib/x86_64-linux-gnu/libopencv_ml.so -lopencv_ml
  /usr/lib/x86_64-linux-gnu/libopencv_objdetect.so -lopencv_objdetect
  /usr/lib/x86_64-linux-gnu/libopencv_ocl.so -lopencv_ocl
  /usr/lib/x86_64-linux-gnu/libopencv_photo.so -lopencv_photo
  /usr/lib/x86_64-linux-gnu/libopencv_stitching.so -lopencv_stitching
  /usr/lib/x86_64-linux-gnu/libopencv_superres.so -lopencv_superres
  /usr/lib/x86_64-linux-gnu/libopencv_ts.so -lopencv_ts
  /usr/lib/x86_64-linux-gnu/libopencv_video.so -lopencv_video
  /usr/lib/x86_64-linux-gnu/libopencv_videostab.so -lopencv_videostab
  -lopencore-amrwb -lopencore-amrnb -lmp3lame -lgsm -lfreetype -lfdk-aac -lgnutls -lcrystalhd -lm -llzma -lbz2 -lz -pthread -ldl -lswresample -lm -lswscale -lm -lavutil -lm

  And the results only for libavutil library :
  

  $ pkg-config —libs libavutil

  -L/usr/local/lib -lavutil -lm

  Please also see my VLC
  Makefile

  Can you please to point at the place where these libraries should be reordered ? Also my pkg-config output results are different from the results from the questions above. Any advice or links to solve this question will be helpful.

• How to capture desktop using ffmpeg ? getting error when stop recording : System.InvalidOperationException : 'StandardIn has not been redirected.'

  4 octobre 2023, par SharonHemed

  I want it to record the entire desktop then when stopping to save the file to the hard drive. and to hide without the console window of the ffmpeg.

  


  but getting this exception error. and i'm setting the RedirectStandardInput to true.
so i'm not sure why it's showing this error.

  


  The exception error is on the line

  


  process.StandardInput.BaseStream.Write(qKey, 0, 1);


  


  The full code

  


  using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using NAudio.CoreAudioApi;
using NAudio.Wave;

namespace Desktop_Recorder
{
    public partial class Form1 : Form
    {
        Process process;

        public Form1()
        {
            InitializeComponent();

            process = new Process();
            Start(@"d:\test.mp4", 30);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            Stop();
        }

        public void Start(string FileName, int Framerate)
        {
            process.StartInfo.FileName = @"d:\ffmpeg\ffmpeg.exe"; // Change the directory where ffmpeg.exe is.  
            process.EnableRaisingEvents = false;
            process.StartInfo.WorkingDirectory = @"D:\"; // The output directory  
            process.StartInfo.Arguments = @"-y -f gdigrab -framerate " + Framerate +
                " -i desktop -preset ultrafast -pix_fmt yuv420p " + FileName;
            process.StartInfo.UseShellExecute = false;
            process.StartInfo.CreateNoWindow = false;
            process.StartInfo.RedirectStandardInput = true; //Redirect stdin
            process.StartInfo.RedirectStandardError = true;
            process.Start();
            System.Threading.Thread.Sleep(3000);  //Wait 3 seconds (for testing).
            Stop();
        }

        public void Stop()
        {
            byte[] qKey = Encoding.GetEncoding("gbk").GetBytes("q"); //Get encoding of 'q' key
            process.StandardInput.BaseStream.Write(qKey, 0, 1); //Write 'q' key to stdin of FFmpeg sub-processs
            process.StandardInput.BaseStream.Flush(); //Flush stdin (just in case).
            process.Close();
        }


        private void btnStartRecording_Click(object sender, EventArgs e)
        {

        }
    }
}


  


• FFmpeg is giving me nightmares

  8 juin 2016, par Guillermo

  So, I’m trying to save animations with the animation.save command. I installed ffmpeg in Windows 10 by placing a folder with its binaries in my drive C :\, I have also set the path in my system variables like C :\ffmpeg\bin, and finally, my code for the animation function saving looks like this

   if save=='True':
  
       mywriter = animation.FFMpegWriter()
  
       plt.rcParams['animation.ffmpeg_path'] = 'C:/ffmpeg/bin' 
  
       ani.save('mymovie.avi',writer=mywriter,fps=30)

  and all other kind of variants such as :

      mpl.animation.ffmpeg_path = r'C:\ffmpeg\bin' 
  
      mpl.animation.ffmpeg_path = 'C:\\ffmpeg\\bin' 

  No matter what I do, the result is always :

  File "<stdin>", line 2, in <module>
  
  File "Plot.py", line 168, in animate
  
  ani.save('mymovie.avi',writer=mywriter,fps=30)
  
  File "c:\users\guillermo\appdata\local\enthought\canopy\user\lib\site-packages\matplotlib\animation.py", line 801, in save
  
  with writer.saving(self._fig, filename, dpi):
  
  File "C:\Users\Guillermo\AppData\Local\Enthought\Canopy\App\appdata\canopy-1.6.1.3253.win-x86_64\lib\contextlib.py", line 17, in __enter__
  
  return self.gen.next()
  
  File "c:\users\guillermo\appdata\local\enthought\canopy\user\lib\site-packages\matplotlib\animation.py", line 194, in saving
  
  self.setup(*args)
  
  File "c:\users\guillermo\appdata\local\enthought\canopy\user\lib\site-packages\matplotlib\animation.py", line 184, in setup
  
  self._run()
  
  File "c:\users\guillermo\appdata\local\enthought\canopy\user\lib\site-packages\matplotlib\animation.py", line 212, in _run
  
  creationflags=subprocess_creation_flags)
  
  File "C:\Users\Guillermo\AppData\Local\Enthought\Canopy\App\appdata\canopy-1.6.1.3253.win-x86_64\lib\subprocess.py", line 710, in __init__
  
  errread, errwrite)
  
  File "C:\Users\Guillermo\AppData\Local\Enthought\Canopy\App\appdata\canopy-1.6.1.3253.win-x86_64\lib\subprocess.py", line 958, in _execute_child
  
  startupinfo)
  
  WindowsError: [Error 5] Access Denied
  
  </module></stdin>

  Any ideas ? :D

  ------------------------------------------------------------------------------

  EDIT : I will reference this answer as it is the one that helped me the best :
  http://stackoverflow.com/a/27017734/6050676

  It worked perfectly when using :

  plt.rcParams['animation.ffmpeg_path'] = 'C:\\ffmpeg\\bin\\ffmpeg.exe'