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• How to select a rectangle of the screen to capture by dragging mouse on transparent background with wxPython ?

  4 août 2019, par makrottk

  I’m working on building an application to capture screen with ffmpeg and would like to determine the portion of the screen to capture by dragging the mouse, drawing a rectangle and passing the arguments to the ffmpeg call.

  I’m using wxPython to build a simple GUI for the application. I’ve gotten to the point where I can draw the rectangle and get the coordinates that I want : offset and size of the selected area.

  import wx
  
  
  
  global selectionOffset, selectionSize
  
  
  
  selectionOffset = ""
  
  selectionSize = ""
  
  
  
  class SelectableFrame(wx.Frame):
  
  
  
      c1 = None
  
      c2 = None
  
  
  
      def __init__(self, parent=None, id=wx.ID_ANY, title=""):
  
          wx.Frame.__init__(self, parent, id, title, size=wx.DisplaySize(), style=wx.TRANSPARENT_WINDOW)
  
  
  
          self.Bind(wx.EVT_MOTION, self.OnMouseMove)
  
          self.Bind(wx.EVT_LEFT_DOWN, self.OnMouseDown)
  
          self.Bind(wx.EVT_LEFT_UP, self.OnMouseUp)
  
          self.Bind(wx.EVT_PAINT, self.OnPaint)
  
  
  
          self.SetCursor(wx.Cursor(wx.CURSOR_CROSS))
  
  
  
      def OnMouseMove(self, event):
  
          if event.Dragging() and event.LeftIsDown():
  
              self.c2 = event.GetPosition()
  
              self.Refresh()
  
  
  
      def OnMouseDown(self, event):
  
          self.c1 = event.GetPosition()
  
  
  
      def OnMouseUp(self, event):
  
          self.SetCursor(wx.Cursor(wx.CURSOR_ARROW))
  
          self.Destroy()
  
  
  
      def OnPaint(self, event):
  
          global selectionOffset, selectionSize
  
          if self.c1 is None or self.c2 is None: return
  
  
  
          dc = wx.PaintDC(self)
  
          dc.SetPen(wx.Pen('red', 1))
  
          dc.SetBrush(wx.Brush(wx.Colour(0, 0, 0), wx.TRANSPARENT))
  
  
  
          dc.DrawRectangle(self.c1.x, self.c1.y, self.c2.x - self.c1.x, self.c2.y - self.c1.y)
  
          selectionOffset = str(self.c1.x) + "x" + str(self.c1.y)
  
          selectionSize = str(abs(self.c2.x - self.c1.x)) + "x" + str(abs(self.c2.y - self.c1.y))
  
      def PrintPosition(self, pos):
  
          return str(pos.x) + "x" + str(pos.y)
  
  
  
  
  
  class MyApp(wx.App):
  
  
  
      def OnInit(self):
  
          frame = SelectableFrame()
  
          frame.Show(True)
  
          self.SetTopWindow(frame)
  
  
  
          return True
  
  
  
  
  
  app = MyApp(redirect=False)
  
  app.MainLoop()
  
  print("offset: " + selectionOffset + ". Screen selection size: " + selectionSize)

  The problem is I can’t get the "background" to be transparent so I can see which portion of the screen I’m really grabbing. How can I do that with wxPython ? If there’s an easier way with another GUI tool or python module I’m open to suggestions. Thanks !

• doc/libav_merge : remove line about ADVANCED_PARSER

  30 avril 2017, par James Almer

  doc/libav_merge : remove line about ADVANCED_PARSER
  It's been addressed.
  Reviewed-by : Hendrik Leppkes <h.leppkes@gmail.com>
  
  Reviewed-by : Aaron Levinson <alevinsn@aracnet.com>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] doc/libav-merge.txt

• How to broadcast a livestream from YouTube to Telegram using vlc from the command-line ?

  22 février 2024, par shackra

  I want to re-transmit a live stream from YouTube (with streamlink) and broadcast it on a Telegram channel using VLC on the command-line. I think VLC is my best option for getting data from the source and sending it to the new destination.

  


  The thing is, I don't know how to configure the output correctly for the Telegram channel, nor how to put the transmission key.

  


  I was reading this answer https://stackoverflow.com/a/40461349/2020214 and using it as a guide unsuccessfully (Telegram does not detect any livestream)