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• 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

• Revision 52bddd44c0 : Clean up error return code in alloccommon.c Clean up the duplicate code as Pasc

  11 octobre 2012, par Yunqing Wang

  Changed Paths : Modify /vp8/common/alloccommon.c Clean up error return code in alloccommon.c Clean up the duplicate code as Pascal suggested. Change-Id : I685fcbb488502e969f6cb73a46db3ea79b90910d

• SVT-AV1 : After encoding the video seeking is very bad in any video player (even HTML5)

  18 juin 2020, par Viktor Machnik

  i am using SVT-AV1 and FFMPEG to encode Videos into the AV1 video and opus audio codec (.webm), it works fine, except that the video seeking do not work really (extremly bad). When i seek, the CPU useage jumps up and it takes up to minutes until the seeking process finishes.

  



  Here is how i encode the videos :

  



  

  1. Convert any video into yuv : ffmpeg -i  -preset veryslow -level 6.2 .yuv

  


  2. First AV1 run svt-av1 -i '.yuv' -w  -h  --fps  --rc 0 -q 30 --preset 8 -b '.\output1.ivf' --output-stat-file '.\stat_file.stat' --keyint 1 --enable-restoration-filtering 1

  


  3. Second AV1 run svt-av1 -i '.yuv' -w  -h  --fps  --rc 0 -q 30 --preset 3 -b '.\output.ivf' --input-stat-file '.\stat_file.stat' --keyint 1 --enable-restoration-filtering 1

  


  4. Get source video audio in opus codec ffmpeg -i  -c:a libopus -vn -preset veryslow -level 6.2 output.ogg

  


  5. Get final .webm video ffmpeg -i output.ivf -i output.ogg -c copy output.webm

  


  



  I have allready tryed to play with the —keyin option, also just letting it away and use the encoder default, but the results are always the same. (--keyin 1 seems to work better than without this option, but also very very bad)

  



  What am i doing wrong ?

  



  Extras : I am using Windows 10 with downloaded version of SVT-AV1 and FFMPEG (I just renamed the SVT-AV1 Encoder .exe file to be svt-av1.exe). Used CPU is Ryzen 9 3900X