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• Revision 29944 : On peut comptabiliser les pages du privé

  17 juillet 2009, par kent1@… — Log

  On peut comptabiliser les pages du privé

• ffmpeg capture output from child window

  3 janvier 2013, par glitchyme

  using xwininfo -all I'm able to see the stats of any window, along with its child windows

  xwininfo: Window id: 0x3c000ba "Electro - The Slag & Prototype Raptor - Crescendo - YouTube - Mozilla Firefox"
  
  
  
    Root window id: 0xa8 (the root window) (has no name)
  
    Parent window id: 0xc001b8 (has no name)
  
       2 children:
  
       0x3c00175 (has no name): ()  1388x876+0+0  +52+24
  
          5 children:
  
          0x3d210ab (has no name): ()  854x510+225+197  +277+221
  
             1 child:
  
             0x3d210ac (has no name): ()  854x510+0+0  +277+221
  
                1 child:
  
                0x40404de "plugin-container": ("plugin-container" "Plugin-container")  854x510+0+0  +277+221
  
                   2 children:
  
                   0x40404e1 (has no name): ()  854x510+0+0  +277+221
  
                   0x40404df (has no name): ()  1x1+-1+-1  +276+220
  
          0x3ddbcf2 (has no name): ()  640x390+225+162  +277+186
  
             1 child:
  
             0x3ddbcf3 (has no name): ()  640x390+0+0  +277+186
  
                1 child:
  
                0x403d545 "plugin-container": ("plugin-container" "Plugin-container")  640x390+0+0  +277+186
  
                   2 children:
  
                   0x403d548 (has no name): ()  640x390+0+0  +277+186
  
                   0x403d546 (has no name): ()  1x1+-1+-1  +276+185
  
          0x3dac7f9 (has no name): ()  640x390+225+162  +277+186
  
             1 child:
  
             0x3dac7fa (has no name): ()  640x390+0+0  +277+186
  
                1 child:
  
                0x4039d8b "plugin-container": ("plugin-container" "Plugin-container")  640x390+0+0  +277+186
  
                   2 children:
  
                   0x4039d8e (has no name): ()  640x390+0+0  +277+186
  
                   0x4039d8c (has no name): ()  1x1+-1+-1  +276+185
  
          0x3c3f939 (has no name): ()  640x390+225+197  +277+221
  
             1 child:
  
             0x3c3f93a (has no name): ()  640x390+0+0  +277+221
  
                1 child:
  
                0x4011918 "plugin-container": ("plugin-container" "Plugin-container")  640x390+0+0  +277+221
  
                   2 children:
  
                   0x401191b (has no name): ()  640x390+0+0  +277+221
  
                   0x4011919 (has no name): ()  1x1+-1+-1  +276+220
  
          0x3c0d1dc (has no name): ()  1x1+0+97  +52+121
  
             1 child:
  
             0x3c0d1dd (has no name): ()  1x1+0+0  +52+121
  
                1 child:
  
                0x4002c1e "plugin-container": ("plugin-container" "Plugin-container")  1x1+0+0  +52+121
  
                   2 children:
  
                   0x4002c40 (has no name): ()  1x1+0+0  +52+121
  
                   0x4002c1f (has no name): ()  1x1+-1+-1  +51+120
  
       0x3c000bb (has no name): ()  1x1+-1+-1  +51+23
  
  
  
    Absolute upper-left X:  52
  
    Absolute upper-left Y:  24
  
    Relative upper-left X:  0
  
    Relative upper-left Y:  0
  
    Width: 1388
  
    Height: 876
  
    Depth: 24
  
    Visual: 0x23
  
    Visual Class: TrueColor
  
    Border width: 0
  
    Class: InputOutput
  
    Colormap: 0x20 (installed)
  
    Bit Gravity State: NorthWestGravity
  
    Window Gravity State: NorthWestGravity
  
    Backing Store State: NotUseful
  
    Save Under State: no
  
    Map State: IsViewable
  
    Override Redirect State: no
  
    Corners:  +52+24  -0+24  -0-0  ç0
  
    -geometry 1388x876-0-0
  
  
  
    Bit gravity: NorthWestGravity
  
    Window gravity: NorthWestGravity
  
    Backing-store hint: NotUseful
  
    Backing-planes to be preserved: 0xffffffff
  
    Backing pixel: 0
  
    Save-unders: No
  
  
  
    Someone wants these events:
  
        KeyPress
  
        KeyRelease
  
        ButtonPress
  
        ButtonRelease
  
        EnterWindow
  
        LeaveWindow
  
        PointerMotion
  
        Exposure
  
        VisibilityChange
  
        StructureNotify
  
        FocusChange
  
        PropertyChange
  
    Do not propagate these events:
  
    Override redirection?: No
  
  
  
    Window manager hints:
  
        Client accepts input or input focus: Yes
  
        Initial state is Normal State
  
        Displayed on desktop 0
  
        Window type:
  
            Normal
  
        Window state:
  
            Maximized Vert
  
            Maximized Horz
  
        Process id: 4087 on host jb
  
        Frame extents: 0, 0, 0, 0
  
  
  
    Normal window size hints:
  
        Program supplied minimum size: 18 by 97
  
        Program supplied maximum size: 1073741824 by 1073741824
  
        Program supplied window gravity: NorthWestGravity
  
    No zoom window size hints defined
  
  
  
    No window shape defined
  
    No border shape defined

  However, if I try capturing from the screen given the size and offset of the child window, then I risk losing data when another window floats ontop of it, I switch to another tab while recording, I resize the child window, or move the child window. Instead, I'd like to use ffmpeg to capture from specifically that child window.

  Ideas ? Tips ? Maybe some other hacks to accomplish this ? Thanks :)

• avformat/mux : Preserve sync even if later packet has negative ts

  18 janvier 2022, par Andreas Rheinhardt

  avformat/mux : Preserve sync even if later packet has negative ts
  write_packet() has code to shift the packets timestamps
  
  to make them nonnegative or even make them start at ts zero ;
  
  this code inspects every packet that is written and if a packet
  
  with negative timestamp (whether this is dts or pts depends upon
  
  another flag ; basically : Matroska uses pts, everyone else dts)
  
  is encountered, this is offset to make the timestamp zero.
  
  All further packets will be offset accordingly (with the offset
  
  converted according to the streams' timebases).
  This is based around an assumption, namely that the timestamps
  
  are indeed non-decreasing, so that the first packet with negative
  
  timestamps is the first packet with timestamps. This assumption
  
  is often fulfilled given that the default interleavement function
  
  by default interleaves per dts ; yet there are scenarios in which
  
  it may not be fulfilled :
  
  a) av_write_frame() instead of av_interleaved_write_frame() is used.
  
  b) The audio_preload option is used.
  
  c) When the timestamps that are made nonnegative/zero are pts
  
  (i.e. with Matroska), because the packet with the smallest dts
  
  is not necessarily the packet with the smallest pts.
  
  d) Possibly with custom interleavement functions.
  
  In these cases the relative sync of the first few packet(s) is offset
  
  relative to the later packets. This contradicts the documentation
  
  ("When shifting is enabled, all output timestamps are shifted by
  
  the same amount").
  Therefore this commit changes this : As soon as the first packet
  
  with valid timestamps is output, it is checked and recorded whether
  
  the timestamps need to be shifted. Further packets are no longer
  
  checked for needing to be offset ; instead they are simply offset.
  
  In the cases above this leads to packets with negative timestamps
  
  (and the appropriate warnings) instead of desync. This will mostly
  
  be fixed in the next commit.
  This commit also factors handling the avoid_negative_ts stuff out
  
  of write_packet() in order to be able to return immediately.
  Tickets #4536 and #5784 as well as the matroska-avoid-negative-ts-test
  
  are examples of c) ; as has been said, some timestamps are now negative,
  
  yet the ref file update does not show it because ffmpeg.c sanitizes
  
  the timestamps (-copyts disables it ; ffprobe and mkvinfo also show
  
  the original timestamps).
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavformat/internal.h
  • [DH] libavformat/mux.c
  • [DH] libavformat/options.c
  • [DH] tests/fate/matroska.mak
  • [DH] tests/ref/fate/matroska-avoid-negative-ts