[FFmpeg-devel] [PATCH] Add Win32 GDI-based screen grabbing

Michael Niedermayer michaelni at gmx.at
Wed Apr 2 04:34:31 CEST 2014

On Mon, Mar 24, 2014 at 04:36:37PM -0400, Calvin Walton wrote:
> Based on original code by Chrisotphe Gisquet in 2010, updated to work
> with current ffmpeg APIs.
> Supports grabbing a single window or an area of the screen, including
> support for multiple monitors (Windows does funky stuff with negative
> coordinates here).
> I've moved most of the configuration to AVOptions; the input file name
> is now only the string "desktop", or "title=<windowname>" to select a
> single window. The AVOptions are the same as x11grab where possible.
> Code has been added to support a "show_region" mode, like x11grab, which
> will draw a rectangle on the screen around the area being captured.
> Instead of duplicating code for paletted image handling, I make use of
> the GDI API's ability to output DIB (BMP) images, which can be run
> through ffmpeg's existing BMP decoder.
> Signed-off-by: Calvin Walton <calvin.walton at kepstin.ca>
> ---
>  Changelog                |   1 +
>  configure                |   5 +
>  doc/general.texi         |   1 +
>  doc/indevs.texi          |  75 ++++++
>  libavdevice/Makefile     |   1 +
>  libavdevice/alldevices.c |   1 +
>  libavdevice/gdigrab.c    | 635 +++++++++++++++++++++++++++++++++++++++++++++++
>  7 files changed, 719 insertions(+)
>  create mode 100644 libavdevice/gdigrab.c

this breaks compilation with mingw

ffmpeg/libavdevice/gdigrab.c: In function ‘gdigrab_region_wnd_init’:
ffmpeg/libavdevice/gdigrab.c:162:29: error: ‘GWL_WNDPROC’ undeclared (first use in this function)
ffmpeg/libavdevice/gdigrab.c:162:29: note: each undeclared identifier is reported only once for each function it appears in
ffmpeg/libavdevice/gdigrab.c: In function ‘gdigrab_read_packet’:

also do you (or someone else) want to maintain this code ?
if so please add yourself to the MAINTAINERs file


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Dictatorship naturally arises out of democracy, and the most aggravated
form of tyranny and slavery out of the most extreme liberty. -- Plato
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