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• ffmpeg capture single window screen freezes with only mouse working

  2 septembre 2015, par Saad Abdullah

  Scenario and Problem :
  I have two machines with windows 8.1 installed. On one computer, every thing works fine with video recording by using gdigrab to capture a window by title. But on the other pc, the desktop recording works fine, but when it comes to capture single window by title, the video freezes with only mouse working. (to be exact, if i play webcam or images in the window being captured, it records the content too, but when some video is played it starts showing black screen or freezed at first frame.

  Commandline :
  here is the commandline args

  ffmpeg -f gdigrab -framerate 30 -i title="Video - VLC media player" germ.flv

  What can be the issue on the other pc ?

• Pointers returned by xlib don't match any existing window IDs

  1er septembre 2022, par Kroltan

  I'm using some X11 bindings to query some window information and later pass it to FFmpeg. FFmpeg expects a "window ID" given in hexadecimal notation.

  


  This notation seems somewhat standard, as it is returned by programs like xwininfo or wmctrl. I haven't found much information about it, but it seems to just be the hexadecimal representation of the window pointer ? If I take the ID string given by these programs and give it to FFmpeg, it is able to capture the window correctly :

  


  $ xwininfo

xwininfo: Please select the window about which you
          would like information by clicking the
          mouse in that window.

xwininfo: Window id: 0x2800014 "Desktop — Plasma"

$ ffmpeg -f x11grab -window_id 0x2800014 -i :0+0,0 -f apng -vframes 1 out.png
# works fine


  


  However, if I try listing all the windows in code :

  


  var root = Window.None;
var parent = Window.None;
Xlib.XQueryTree(_display, Xlib.XDefaultRootWindow(_display), ref root, ref parent, out var children);

var ids = children
    .Select(ptr => $"0x{(ulong) ptr:x}")
    .ToArray();


  


  I don't see 0x2800014 in the results (even disregardingleading zeroes), and if I try running FFmpeg on one of those results, it fails terribly :

  


  $ ffmpeg -f x11grab -window_id 0x4400003 -i :0+0,0 -f apng -vframes 1

# snipped for brevity

Trailing option(s) found in the command: may be ignored.
[x11grab @ 0x55b811a8da40] Cannot get the image data event_error: response_type:0 error_code:8 sequence:10 resource_id:167772160 minor_code:4 major_code:130.
[x11grab @ 0x55b811a8da40] Continuing without shared memory.
[x11grab @ 0x55b811a8da40] Cannot get the image data event_error: response_type:0 error_code:8 sequence:11 resource_id:71303171 minor_code:0 major_code:73.
Input #0, x11grab, from ':0+0,0':
  Duration: N/A, bitrate: 38361 kb/s
  Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 200x200, 38361 kb/s, 29.97 fps, 1000k tbr, 1000k tbn
At least one output file must be specified


  


  So I must conclude my guess that they are hex pointers is incorrect, or that the Window type is not the pointer itself, but then the question stands, how can I get the actual window IDs so I can pass them to FFmpeg ?

  


• How to play videos inside pygtk3 window using ffmpeg plugin ?

  1er octobre 2018, par Jin

  Trying to play videos inside pygtk3 windows using ffmpeg plugin.added the code for Gtk window , need help with code on how to make video appear inside the window , Im tryin to create a simple video player for a class project , requirements > should be done using the open source ffmpeg plugin. Any help would be much appreciated.

  import gi
  
  gi.require_version('Gtk','3.0')
  
  from gi.repository import Gtk
  
  
  
  class app(Gtk.Window):
  
      def __init__(self):
  
          Gtk.Window.__init__(self,title='TODAYS TEST & GREAT !!!')
  
      self.set_default_size(500,20)
  
  
  
      #Setting a BOX
  
      box=Gtk.Box()
  
      self.add(box)
  
  
  
      menubar=Gtk.MenuBar()
  
  
  
      # File
  
      filemenu=Gtk.Menu()
  
      filemenudrop=Gtk.MenuItem('FILE')
  
      file_open=Gtk.MenuItem('Open')
  
      file_open.connect('activate',self.fileopen)
  
      file_new=Gtk.MenuItem('New')
  
  
  
  
  
  
  
      filemenudrop.set_submenu(filemenu)
  
      filemenu.append(file_open)
  
      filemenu.append(file_new)
  
  
  
  
  
      #Edit
  
      editmenu=Gtk.Menu()
  
      editmenudrop=Gtk.MenuItem('EDIT')
  
      edit_cut=Gtk.MenuItem('Cut')
  
      edit_copy=Gtk.MenuItem('Copy')
  
      editmenudrop.set_submenu(editmenu)
  
      editmenu.append(edit_cut)
  
      editmenu.append(edit_copy)
  
  
  
      #Mainmenu final appends & packing to box
  
      menubar.append(filemenudrop)
  
      menubar.append(editmenudrop)
  
      box.pack_start(menubar,True,True,0)
  
  
  
  # Setting functions for menuabar items (Naturally created after menubar and its better that way ....1)   
  
  def fileopen(self,widget):
  
      print('hello')        
  
  
  
  
  
  
  
  
  
  window=app()
  
  window.connect('destroy',Gtk.main_quit)
  
  window.show_all()
  
  Gtk.main()