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  tar xzf libav-11.4.tar.gz
  tar xzf libav-11.4.tar.gz
  cd libav-11.4
  cd libav-11.4
  ./configure --enable-pic
  make -j 4
  make -j 4

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== On Windows ==
== On Windows ==

The MXE builds >= 4.0.1-rc3 already includes the ffmpeg libs so video should run out of the box.
=== using official mxe-build and ffmpeg binaries ===

[[Category:Octave Forge]]
This is at the moment the preferred way for windows users and assumes that you've installed Octave from the official MXE build from https://ftp.gnu.org/gnu/octave/windows/ to the default path.
Download the ffmpeg binaries for windows from https://ffmpeg.zeranoe.com/builds/. You need the "32-bit Dev" and "32-bit Shared" archive. These instructions were tested with
* ffmpeg-20160105-git-68eb208-win32-shared.7z
* ffmpeg-20160105-git-68eb208-win32-dev.7z
* Extract the bin/*.dll from ffmpeg-20160105-git-68eb208-win32-shared.7z to C:\Octave\Octave-4.0.0\bin
* Extract include/* from ffmpeg-20160105-git-68eb208-win32-dev.7z to C:\Octave\Octave-4.0.0\include (You should now, for example, see C:\Octave\Octave-4.0.0\include\libavutil\version.h)
* Extract lib/* from ffmpeg-20160105-git-68eb208-win32-dev.7z to C:\Octave\Octave-4.0.0\lib
Download a patched version (no pkg_config check for ffmpeg and PixelFormat -> AVPixelFormat) from [http://www.tech-chat.de/files/video-1.2.1_win_ffmpeg.tar.gz video-1.2.1_win_ffmpeg.tar.gz (sha1sum 3ef5b0dca471175daf769bd813b6de7fa85759df)]
or grab the source and apply [http://www.tech-chat.de/files/video-1.2.1_win_ffmpeg.patch this patch]
Compile and install from Octave with
pkg -verbose install video-1.2.1_win_ffmpeg.tar.gz
Load it before any usage:
pkg load video
=== mxe-octave ===
You can also use mxe-octave to include ffmpeg, there is already a target for it.
= Known bugs =
* On MXE-Octave with ffmpeg crosscompiled "clear all" after using "addframe" causes a segmentation fault
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1956.0xdd4]
0x77d6e3c6 in ntdll!RtlInitUnicodeString () from C:\Windows\SysWOW64\ntdll.dll
(gdb) bt
#0  0x77d6e3c6 in ntdll!RtlInitUnicodeString ()
  from C:\Windows\SysWOW64\ntdll.dll
#1  0x19380000 in ?? ()
#2  0x77d6e013 in ntdll!RtlFreeHeap () from C:\Windows\SysWOW64\ntdll.dll
#3  0x778698cd in msvcrt!free () from C:\Windows\syswow64\msvcrt.dll
#4  0x19380000 in ?? ()
#5  0x1dc016c6 in AVHandler::~AVHandler (this=0x1da579a8,
    __in_chrg=<optimized out>) at AVHandler.cc:99
#6  0x1dc0384a in Avifile::~Avifile (this=0x1dac8570,
    __in_chrg=<optimized out>) at oct-avifile.cc:149
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