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• lavf : deprecate av_stream_get_end_pts()

  17 août 2022, par Anton Khirnov

  lavf : deprecate av_stream_get_end_pts()
  According to its documentation it returns "pts of the last muxed packet
  
  + its duration", but the value it actually returns right now is
  
  (possibly guessed) dts after muxer-internal bitstream filtering (if
  
  any).
  This function was added for ffmpeg.c, but it is not used there anymore.
  
  Since the value it returns is ill-defined and so inappropriate for any
  
  serious use, deprecate it.
  

  • [DH] doc/APIchanges
  • [DH] libavformat/avformat.h
  • [DH] libavformat/mux_utils.c
  • [DH] libavformat/version_major.h

• Why is this code not writing png file ? I can not get any error code

  3 décembre 2019, par Go0od

  It not writing png file. I can’t get any error code. I want to save central widget to png file. I have 2 files, one is main file and second one is ui file. At first the program does not run properly and crashes. Link has ui file

  main.py

  import sys
  
  from PyQt5.QtWidgets import QWidget
  
  from PyQt5 import QtCore, QtGui, QtWidgets
  
  from green import Ui_MainWindow
  
  class MyWindow(QtWidgets.QMainWindow, Ui_MainWindow, QWidget):
  
     def __init__(self):
  
      QtWidgets.QMainWindow.__init__(self)
  
      Ui_MainWindow.__init__(self)
  
  
  
      self.setupUi(self)
  
      self.widger_screen()
  
  
  
  def widger_screen(self):
  
  
  
      self.process = QtCore.QProcess(app)
  
      self.process.setProcessChannelMode(self.process.ForwardedChannels)
  
      self.process.setOpenMode(self.process.WriteOnly)
  
      self.process.start('ffmpeg',
  
                         ['-y',
  
                          '-analyzeduration', '1000',
  
                          '-vcodec', 'png', '-i', '-',
  
                          '-vcodec', 'mpeg4',
  
                          '-qscale', '5', '-r', '24', 'video.avi',
  
                          "-loglevel2", "debug"])
  
      for i in range(100):
  
          QWidget.grab(self.centralwidget).save(self.process, "PNG")
  
  
  
  if __name__ == '__main__':
  
  app = QtWidgets.QApplication(sys.argv)
  
  window = MyWindow()
  
  window.show()
  
  sys.exit(app.exec_())

  green.ui
  https://paste.pythondiscord.com/ugorifokiq.py

• How to take a screenshot of desktop fast with Java in Windows (ffmpeg, etc.) ?

  3 février 2018, par Setsuna

  I would like to use java to take a screenshot of my machine using FFMPEG or some other solution. I know linux works with ffmpeg without JNI, but running it in Windows does not work and may require (JNI ?) is there any sample of some simple Java class (and anything else necessary) to capture a screenshot runnable in a windows environment ? Is there some alternative to FFMPEG ? I want to take screenshot at a rate faster than the Java Robot API, which I have found to work at taking screenshots, but is slower than I would like.

  I know in Linux this works very fast :

  import com.googlecode.javacv.*;
  
  
  
  public class ScreenGrabber {
  
      public static void main(String[] args) throws Exception {
  
          int x = 0, y = 0, w = 1024, h = 768;
  
          FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(":0.0+" + x + "," + y);
  
          grabber.setFormat("x11grab");
  
          grabber.setImageWidth(w);
  
          grabber.setImageHeight(h);
  
          grabber.start();
  
  
  
          CanvasFrame frame = new CanvasFrame("Screen Capture");
  
          while (frame.isVisible()) {
  
              frame.showImage(grabber.grab());
  
          }
  
          frame.dispose();
  
          grabber.stop();
  
      }

  This does not work in windows environment. Am not sure if there is some way I could use this same code, but use javacpp to actually get it working without having to change much of the above code.

  Goal is to take screenshots of screen fast, but then stop after it takes a screenshot that is "different", aka. screen changed because of some event like, a window is window closed, etc.