Recherche avancée

Sur d’autres sites (2377)

• Screen recorder in Ubuntu using python

  3 août 2013, par mridul

  I am a hobby programmer and trying to make screen-recorder in Ubuntu using python.
  Using this code able to take screenshot.

  import wx
  
  app = wx.App(False)
  
  s = wx.ScreenDC()
  
  w, h = s.Size.Get()
  
  b = wx.EmptyBitmap(w, h)
  
  m = wx.MemoryDCFromDC(s)
  
  m.SelectObject(b)
  
  m.Blit(0, 0, w, h, s, 0, 0)
  
  m.SelectObject(wx.NullBitmap)
  
  b.SaveFile("screenshot.png", wx.BITMAP_TYPE_PNG)

  And using loop I take more pictures and create video using these screen shots.My code is given bellow,

  import wx,os
  
  app=wx.App(False)
  
  s = wx.ScreenDC()
  
  w, h = s.Size.Get()
  
  b = wx.EmptyBitmap(w, h)
  
  m = wx.MemoryDCFromDC(s)
  
  i=0
  
  while i<50:
  
     m.SelectObject(b)
  
     m.Blit(0, 0, w, h, s, 0, 0)
  
     m.SelectObject(wx.NullBitmap)
  
     b.SaveFile('{0:05d}.png'.format(i), wx.BITMAP_TYPE_PNG)
  
     i+=1
  
  os.system('ffmpeg -f image2 -r 8 -i %05d.png -vcodec mpeg4 -y movie1.mp4')
  
  i=0  
  
  while i<50:
  
     os.remove('{0:05d}.png'.format(i))
  
     i += 1   `

  In above code I take 50 pictures and store as 00000.png to 00049.png and make video using ffmpeg.
  After creating video I delete all pictures.

  Current Problems :

  • Very small delay between screen shoots. If try to record videos using this code out put is not perfect.
  • For recording long time it is not efficient. It take lot of hard drive memory to store screen shoots. And use more CPU .

  What I do for get code more efficient ? Using pure python how to create video from pictures ? Is there any alternative methods to record screen ?
  I like to improve my code.

• ffmper with vlc - too heavy screen grabbing, resulting injumpy file, frame loss

  15 mai 2016, par OGP

  I’m using ’vlc/ffmpeg’ package to grab the screen and convert it to H.264 file.

  The problem arises when the host is heavily loaded. I need to maintain correct time stamps and use the 5 fps (relatively low frame rate). Yet sometimes the resulting file jumps few seconds forward, apparently due to frame loss.
  I can deal with the frame loss, it’s OK, but I need to duplicate lost frames to maintain correct timing.

  My configuration file :

  vlc.exe screen :// -I dummy —verbose=2 —one-instance :screen-fps=5 :screen-caching=10000 :sout=#transcodevenc=x264preset=ultrafast,tune=zerolatency,vcodec=h264,fps=5,vb=3000,width=1024,height=576,acodec=none:filedst="C :\tmp\output.mp4"

  What should I add/config to preserve proper time stamps and clip duration ?

  Many thanks for your help.

• Trouble turning the screen horizontally in ffmpeg

  10 avril 2021, par Kam4c

  first of all I will try to explain this problem by using google translate because I do not know English well.

  


  I'm trying to post my screen recording on my webcam with ffmpeg. My screen is reversed horizontally in a way that I don't understand when I do this. I will need help for this.

  


  ffmpeg -f x11grab -r 60 -s 1366x768 -i :0+0,0 -vf hflip -vf scale=1920x1080 -pix_fmt yuv420p -f v4l2 /dev/video50


  


  I did a few researches on the internet to fix this. A few parameters like -vf vflip are used, but I have tried almost all of them.
But I couldn't get any results.

  


  Screenshot :


  


  I hope a solution will be found.