Editing Video package

The {{Forge|video}} package is part of the [[Octave Forge]] project and tries to implement the video functions from matlab. It should compile with ffmpeg and libav.

= Installation =

== on Debian Jessie using "pkg -forge" ==

 sudo apt-get install libavutil-dev libavformat-dev libswscale-dev libavcodec-dev

On the Octave prompt:

 >> pkg install -forge video

== on CentOS Linux release 7.2.1511 (Core) with GNU Octave Version 3.8.2 ==

 yum install octave-devel
 yum install libvorbis  yasm freetype zlib bzip2 faac lame speex libvpx libogg  libtheora  x264 XviD openjpeg15 opencore-amr
 wget https://libav.org/releases/libav-11.4.tar.gz
 tar xzf libav-11.4.tar.gz
 cd libav-11.4
 ./configure --enable-pic
 make -j 4

as root:

 make install

On the Octave prompt:

 >> pkg install -forge video

== On Windows ==

=== using official mxe-build and ffmpeg binaries ===

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

Now

* 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

Compile and install from Octave with
<code>
 pkg -verbose -forge install video
</code>

Load it before any usage:
<code>
 pkg load video
</code>

=== mxe-octave ===
You can also use mxe-octave to include ffmpeg, there is already a target for it. Future versions of MXE-Octave builds will already have video included.

= Known bugs =
* On MXE-Octave with ffmpeg crosscompiled "clear all" after using "addframe" causes a segmentation fault

<code>
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
</code>

[[Category:Octave-Forge]]