There are 4 code paths when taking a screenshot:
- textured rendering mode
- StretchRect rendering mode with planar formats
- StretchRect with packed formats
- full-window screenshot mode
The implementation of the full-window mode (capturing the window contents,
instead of the video) is very inefficient: it will create a surface of
desktop size, copy the desktop contents, allocate a new memory image, and
copy in the window contents. The code in screenshot.c will (as of now)
allocate and convert the image from BGR to RGB, and allocate a destination
buffer for the libavcodec PNG writer.
If parts of the mplayer window are obscured, the full-window mode wil
contain these parts as seen on the screen. Parts of the window that are
outside the bounds of the desktop are clipped away. It is not known
whether full-window mode works on multi-monitor setups.
Compiling with full features requires development files for several
external libraries. Below is a list of some important requirements. For
more information see the output of './configure --help' for a list of options,
or look at the list of enabled and disabled features printed after running
'./configure'. If you think you have support for some feature installed
but configure fails to detect it, the file config.log may contain information
about the reasons for the failure.
Libraries specific to particular video output methods
(you'll want at least one of VDPAU, GL or Xv):
- libvdpau (for VDPAU output, best choice for NVIDIA cards)
- libGL (OpenGL output)
- libXv (XVideo output)
general:
- libasound (ALSA audio output)
- various general X development libraries
- libfreetype
- libfontconfig
- libass
- FFmpeg libraries (libavutil libavcodec libavformat libswscale libpostproc)
Most of the above libraries are available in suitable versions on normal
Linux distributions. However FFmpeg is an exception (distro versions may be
too old to work at all or work well). For that reason you may want to use
the separately available build wrapper that first compiles FFmpeg libraries
and libass, and then compiles the player statically linked against those.
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