Recherche avancée

Sur d’autres sites (13111)

• Pulseaudio record multiple xfbv screens with python

  10 octobre 2020, par Eric Lagarda

  I’m trying to do something complicated and I need some help.

  


  I’m able to record a session (video and audio) with python using xvfb and ffmpeg.

  


  I just want to visit a page using selenium and record the video and audio. It’s working but when I try to run multiple instances, the audio is mixing between records.

  


  How can achieve that ? I’m using pulseaudio. I know that with alsa you can set like a interface per instance, but I don’t know how to do it.

  


  Thanks for you support and comments.

  


• Unknown reason of an error while debugging an Opencv project using opencv2 functions

  30 mars 2013, par Animesh Pandey

  I have openCV 2.3 and I am using Visual Studio 2010.

      ...
  
  VideoCapture cap;
  
  cap.open("Video.avi");
  
  if( !cap.isOpened() )
  
  {
  
  
  
      puts("***Could not initialize capturing...***\n");
  
      system("Pause");
  
      return 0;
  
  } ...

  This is a code snippet of the while program.
  I added a system command in order to hold the output window. I got no errors while building the project but when I began debugging, the output window had this output :

  warning: Error opening file (../../modules/highgui/src/cap_ffmpeg_impl.hpp:477)
  
  ***Could not initialize capturing...***
  
  
  
  Press any key to continue . . .

  I checked this directory, the file is available but then why is it that it doesn't open ?
  I even have the opencv_ffmpeg.dll in the bin folder with its path added to System Paths.
  Still I get this same error ....
  I even checked first 3 pages of google search I did but could not find an answer.
  So please help !

  ---

  The error which I mentioned is because, there has been an error in opening the .avi file ...
  This is the part of code in cap_ffmpeg_impl.hpp -

  int err = av_open_input_file(&ic, _filename, NULL, 0, NULL);
  
  if (err < 0) {
  
      CV_WARN("Error opening file"); //Error part
  
      goto exit_func;
  
  }

  This file is available at D :\OpenCV2.3\opencv\modules\highgui\src. When I make any changes in this file, they do not reflect on the output window and when I removed this file, even then it did not give any error !:O
  I am not able to understand what is happening ....??

• Special characters in ffmpeg cmd

  28 avril 2021, par user12221095

  Good day.

  


  I am trying to write a batch file to easily record an specific window running on the background while I can work on something else. The current code is :

  


  set Clase=Estacion Servicio 1
set Audio="@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{9B5F7B86-881D-490E-BA6F-1D4DFE78C334}"
ffmpeg -rtbufsize 2G -f gdigrab -framerate 20 -i title="Title" -f dshow -i audio=%Audio% -b:v 180K -maxrate 200K -bufsize 1M -ab 96k "C:\Users\Usuario\Documents\Clases\%Clase%.mp4"
pause 


  


  The code works great for the quality required, however the title of the window I need to capture sometimes has special characters which ffmpeg isn't recognising, for example, replacing "Title" with :

  


  Reproductor de grabaciones basadas en red - Curso Modelación y cálculo de una estación de servicio (1/6)

  


  (title copied from PowerShell to avoid spelling mistakes)

  


  fails with the following error :

  


  [gdigrab @ 0000018079ce37c0] Can't find window 'Reproductor de grabaciones basadas en red - Curso Modelación y cálculo de una estación de servicio (1/6)', aborting.
title=Reproductor de grabaciones basadas en red - Curso Modelación y cálculo de una estación de servicio (1/6): I/O error


  


  I imagine all I have to do is replace the "á" and "ó" with something, but I don't know what.

  


  Thanks.